Online Math Tools and Calculators

Math, Date & Finance

Absolute Value Calculator

Calculate the absolute value of positive, negative, or decimal numbers and explain the sign relationship

Math, Date & Finance

Acre to Hectare

Convert acres to hectares with configurable decimal precision

Math, Date & Finance

Acre to Square Feet

Convert acres to square feet with configurable decimal precision

Math, Date & Finance

Acre to Square Meter

Convert acres to square meters with configurable decimal precision

Math, Date & Finance

Adjusted R-Squared Calculator

Calculate adjusted R squared from R squared, sample size, and predictor count

AI & Generators

AI Math Solver/Photomath

Solve math problems from images using AI vision models with step-by-step explanations

Math, Date & Finance

Angle Unit Converter

Convert between different angle units (degrees, radians, gradians, minutes, seconds, etc.)

Math, Date & Finance

ANOVA Calculator

Run one-way ANOVA across multiple groups and inspect sums of squares, F statistic, and p-value

Math, Date & Finance

Antilog Calculator

Calculate antilogarithms for any valid base and optionally verify the result by applying the logarithm again

Math, Date & Finance

Area Unit Converter

Convert between different area units (square meters, square feet, acres, hectares, etc.)

Math, Date & Finance

Arithmetic Sequence Calculator

Calculate the nth term, first terms, and finite sum of an arithmetic sequence

Math, Date & Finance

Average Calculator

Compare arithmetic, geometric, and harmonic averages for a numeric dataset in one place

Math, Date & Finance

Basic Calculator

Perform basic arithmetic calculations with support for multiple operations

Math, Date & Finance

Bayes Theorem Calculator

Calculate posterior probability P(A given B) using prior, likelihood, and false-positive rate

Math, Date & Finance

Big Number Calculator

Perform arithmetic operations on very large numbers

Math, Date & Finance

Binomial Distribution Calculator

Calculate exact, cumulative, and upper-tail binomial probabilities for independent Bernoulli trials

Math, Date & Finance

Bit to Byte

Convert bits to bytes with configurable decimal precision

Math, Date & Finance

Break-Even Calculator

Calculate the break-even point for a product or business based on fixed costs, variable costs, and price

Math, Date & Finance

Byte to Bit

Convert bytes to bits with configurable decimal precision

Math, Date & Finance

Byte to MB

Convert bytes to megabytes using the decimal MB standard with configurable precision

Math, Date & Finance

Bytes to KB

Convert bytes to kilobytes using decimal storage units

Math, Date & Finance

Bytes to MB

Convert bytes to megabytes using decimal storage units

Math, Date & Finance

Celsius to Fahrenheit

Convert Celsius to Fahrenheit with configurable decimal precision

Math, Date & Finance

Celsius to Kelvin

Convert Celsius to Kelvin with configurable decimal precision

Math, Date & Finance

Chemical Equation Balancer

Automatically balance chemical equations using linear algebra methods

Math, Date & Finance

Chi-Square Distribution Calculator

Calculate chi-square distribution PDF, CDF, and right-tail probability from a statistic and degrees of freedom

Math, Date & Finance

Chi-Square Test Calculator

Run chi-square goodness-of-fit or independence tests from observed counts or contingency tables

Math, Date & Finance

CM to Inches

Convert centimeters to inches with configurable decimal precision

Math, Date & Finance

CM to MM

Convert centimeters to millimeters with configurable decimal precision

Math, Date & Finance

Coefficient of Variation Calculator

Calculate coefficient of variation as relative standard deviation for comparing variability across datasets

Data & Tables

Column Calculator

Perform calculations on columns and add new rows

Math, Date & Finance

Combination Calculator

Calculate combinations (C(n,r)) with support for different types: with/without repetition, binomial coefficients, and detailed combinatorial analysis.

Math, Date & Finance

Commission Calculator

Calculate sales commission and total earnings based on sales amount and commission rate

Math, Date & Finance

Complex Number Calculator

Perform structured arithmetic and analysis for complex numbers in algebraic and polar form

Math, Date & Finance

Conditional Probability Calculator

Calculate P(A given B) from joint probability P(A and B) and condition probability P(B)

Math, Date & Finance

Confidence Interval Calculator

Calculate confidence intervals for a sample mean or proportion using either raw data or summary statistics

Math, Date & Finance

Continued Fraction Calculator

Convert numbers to continued fraction representation

Math, Date & Finance

Correlation Calculator

Calculate Pearson and Spearman correlation coefficients from paired numeric data

Math, Date & Finance

Covariance Calculator

Calculate sample and population covariance from paired numeric data

Math, Date & Finance

Credit Hour Calculator

Estimate academic credit hours from weekly lecture, lab, studio, term length, and contact-hour rules

Math, Date & Finance

Cross Product Calculator

Compute the 2D signed area or 3D cross product between two vectors

Math, Date & Finance

Cube Root Calculator

Calculate cube roots for positive or negative numbers and verify the cubed result

Math, Date & Finance

Cubic Equation Solver

Solve cubic equations, classify the root pattern, and show Cardano-style intermediate values

Math, Date & Finance

Cubic Feet to Gallon

Convert cubic feet to US liquid gallons with configurable decimal precision

Math, Date & Finance

Cubic Meter to Liter

Convert cubic meters to liters with configurable decimal precision

Math, Date & Finance

Cup to Liter

Convert US cups to liters with configurable decimal precision

Math, Date & Finance

Cup to OZ

Convert US cups to US fluid ounces with configurable decimal precision

Math, Date & Finance

Data Storage Unit Converter

Convert between different data storage units (bit, byte, KB, MB, GB, TB, etc.)

Math, Date & Finance

Day of Week Calculator

Calculate what day of the week a given date falls on

Math, Date & Finance

Days to Hours

Convert days to hours with configurable decimal precision

Math, Date & Finance

Days to Months

Convert whole days to exact calendar months from a specified start year and month

Math, Date & Finance

Days to Weeks

Convert days to weeks with configurable decimal precision

Math, Date & Finance

Days to Years

Convert whole days to exact calendar years from a specified start year

Math, Date & Finance

Decimal to Fraction Calculator

Convert decimals into simplified fractions or mixed numbers with configurable tolerance and denominator limits

Math, Date & Finance

Density Unit Converter

Convert between different density units (kg/m³, g/cm³, lb/ft³, etc.)

Math, Date & Finance

Derivative Calculator

Calculate derivatives of common functions

Math, Date & Finance

Determinant Calculator

Compute the determinant of a square matrix and explain the main calculation steps

Math, Date & Finance

Digital Root Calculator

Calculate the digital root of numbers. The digital root is the recursive sum of digits until a single digit is obtained.

Math, Date & Finance

Discount Calculator

Calculate discounted prices, savings, and final price after applying percentage or fixed amount discounts

Math, Date & Finance

Divisibility Calculator

Check whether one integer is divisible by another and show the quotient, remainder, and optional divisibility hint

Math, Date & Finance

Dot Product Calculator

Compute the dot product, cosine similarity, and angle between two vectors

Math, Date & Finance

Effect Size Calculator

Calculate Cohen d, Hedges g, Cohen h for proportions, or correlation r effect sizes from summary statistics

Math, Date & Finance

Electricity Calculator

Calculate electricity costs based on power consumption and usage time

Math, Date & Finance

Energy Unit Converter

Convert between different energy units (joules, calories, kilowatt-hours, BTU, etc.)

Math, Date & Finance

Exponential Calculator

Calculate natural exponential values e^x, inspect growth factors, and compare them with the inverse e^-x

Math, Date & Finance

Exponential Distribution Calculator

Calculate PDF, CDF, survival probability, and interval probability for an exponential distribution

Math, Date & Finance

F Distribution Calculator

Calculate F distribution density, cumulative probability, and right-tail probability from numerator and denominator degrees of freedom

Math, Date & Finance

Factorial Calculator

Calculate n! for a non-negative integer with exact BigInt output, optional steps, and related values such as trailing zeros

Math, Date & Finance

Fahrenheit to Celsius

Convert Fahrenheit to Celsius with configurable decimal precision

Math, Date & Finance

Fahrenheit to Kelvin

Convert Fahrenheit to Kelvin with configurable decimal precision

Math, Date & Finance

Feet to Meter

Convert feet to meters with configurable decimal precision

Math, Date & Finance

Feet to Mile

Convert feet to miles with configurable decimal precision

Math, Date & Finance

Feet to Yard

Convert feet to yards with configurable decimal precision

Math, Date & Finance

Fibonacci Sequence Generator

Generate Fibonacci sequence with customizable start numbers, length, and output format. Includes golden ratio analysis and mathematical properties.

Math, Date & Finance

Final Grade Calculator

Calculate the score needed on a final exam to reach a desired overall course grade

Math, Date & Finance

Fisher Exact Test Calculator

Run Fisher exact test for a 2 x 2 contingency table with exact one-sided or two-sided p-values

Math, Date & Finance

Force Unit Converter

Convert between different force units (newton, pound-force, kilogram-force, dyne, etc.)

Math, Date & Finance

Fourier Series Calculator

Calculate Fourier series coefficients for common waveforms

Math, Date & Finance

Fraction Calculator

Evaluate fraction expressions, simplify results, and show decimal plus mixed-number forms

Math, Date & Finance

Fraction Decimal Converter

Convert between fractions and decimals with support for mixed numbers, improper fractions, and various decimal formats

Math, Date & Finance

Fraction to Decimal Calculator

Convert fractions or mixed numbers into decimals with configurable precision and percentage output

Math, Date & Finance

G to MG

Convert grams to milligrams with configurable decimal precision

Math, Date & Finance

Gallon to Cubic Feet

Convert US liquid gallons to cubic feet with configurable decimal precision

Math, Date & Finance

Gallon to Liter

Convert US liquid gallons to liters with configurable decimal precision

Math, Date & Finance

Gallon to Quart

Convert US liquid gallons to US liquid quarts with configurable decimal precision

Math, Date & Finance

Gas Price Calculator

Calculate fuel costs based on distance, fuel efficiency, and gas price

Math, Date & Finance

GB to MB

Convert gigabytes to megabytes with decimal vs binary interpretation, alternate-system comparison, and transfer estimates

Math, Date & Finance

GCD & LCM Calculator

Calculate the greatest common divisor and least common multiple for two or more integers

Math, Date & Finance

Geometric Distribution Calculator

Calculate probabilities for the trial number of the first success in repeated Bernoulli trials

Math, Date & Finance

Geometric Mean Calculator

Calculate the geometric mean of positive numeric values for growth rates, ratios, and multiplicative datasets

Math, Date & Finance

Geometric Sequence Calculator

Calculate the nth term, first terms, and finite sum of a geometric sequence

Math, Date & Finance

GPA Calculator

Calculate credit-weighted GPA from course names, credit hours, and letter or numeric grades

Math, Date & Finance

Grade Calculator

Calculate a weighted course grade from assignment scores and category weights

Math, Date & Finance

Grams to KG

Convert grams to kilograms with configurable decimal precision

Math, Date & Finance

Grams to OZ

Convert grams to ounces with configurable decimal precision

Math, Date & Finance

Harmonic Mean Calculator

Calculate the harmonic mean of positive values, with optional arithmetic and geometric mean comparison

Math, Date & Finance

Hectare to Acre

Convert hectares to acres with configurable decimal precision

Math, Date & Finance

Hectare to Square Meter

Convert hectares to square meters with configurable decimal precision

Math, Date & Finance

Hours to Days

Convert hours to days with configurable decimal precision

Math, Date & Finance

Hyperbolic Calculator

Calculate hyperbolic functions (sinh, cosh, tanh)

Math, Date & Finance

Hypergeometric Distribution Calculator

Calculate exact and cumulative probabilities for sampling without replacement

Math, Date & Finance

Inches to CM

Convert inches to centimeters with configurable decimal precision

Math, Date & Finance

Inches to Meter

Convert inches to meters with configurable decimal precision

Math, Date & Finance

Inches to MM

Convert inches to millimeters with configurable decimal precision

Math, Date & Finance

Inches to Yard

Convert inches to yards with configurable decimal precision

Math, Date & Finance

Integral Calculator

Calculate indefinite integrals of common functions

Math, Date & Finance

Interquartile Range Calculator

Calculate Q1, Q3, IQR, and optional 1.5 x IQR outlier fences for a numeric dataset

Math, Date & Finance

KB to Bytes

Convert kilobytes to bytes using decimal storage units

Math, Date & Finance

Kelvin to Celsius

Convert Kelvin to Celsius with configurable decimal precision

Math, Date & Finance

Kelvin to Fahrenheit

Convert Kelvin to Fahrenheit with configurable decimal precision

Math, Date & Finance

Kendall Tau Calculator

Calculate Kendall tau-a and tau-b rank correlation for paired numeric data

Math, Date & Finance

KG to Grams

Convert kilograms to grams with configurable decimal precision

Math, Date & Finance

KG to LB

Convert kilograms to pounds with configurable decimal precision

Math, Date & Finance

KG to Metric Ton

Convert kilograms to metric tons with configurable decimal precision

Math, Date & Finance

KG to Stone

Convert kilograms to stone with configurable decimal precision

Math, Date & Finance

KM to Meter

Convert kilometers to meters with configurable decimal precision

Math, Date & Finance

KM to Miles

Convert kilometers to miles with configurable decimal precision

Math, Date & Finance

KMH to Knot

Convert kilometers per hour to knots with configurable decimal precision

Math, Date & Finance

KMH to MPH

Convert kilometers per hour to miles per hour with configurable decimal precision

Math, Date & Finance

KMH to M/S

Convert kilometers per hour to meters per second with configurable decimal precision

Math, Date & Finance

Knot to KMH

Convert knots to kilometers per hour with configurable decimal precision

Math, Date & Finance

Knot to MPH

Convert knots to miles per hour with configurable decimal precision

Math, Date & Finance

Kruskal-Wallis Calculator

Compare three or more independent groups with the nonparametric Kruskal-Wallis H test

Math, Date & Finance

Kurtosis Calculator

Calculate raw and excess kurtosis to measure tail weight and peakedness of a distribution

Math, Date & Finance

LB to KG

Convert pounds to kilograms with configurable decimal precision

Math, Date & Finance

LB to OZ

Convert pounds to ounces with configurable decimal precision

Math, Date & Finance

LB to Stone

Convert pounds to stone with configurable decimal precision

Math, Date & Finance

LB to Ton

Convert pounds to US short tons with configurable decimal precision

Math, Date & Finance

Least Squares Calculator

Calculate the least-squares regression line, residuals, and squared error diagnostics from paired data

Math, Date & Finance

Length Unit Converter

Convert between different length units (meters, feet, inches, miles, etc.)

Math, Date & Finance

Limit Calculator

Calculate limits of functions as x approaches a value

Math, Date & Finance

Line of Best Fit Calculator

Find the linear trend line of best fit for paired data and predict y values from x

Math, Date & Finance

Linear Equation Solver

Solve linear equations of the form ax + b = 0 using coefficients or a typed equation

Math, Date & Finance

Linear Regression Calculator

Fit a simple least-squares linear regression model and calculate slope, intercept, R squared, and predictions

Math, Date & Finance

Liter to Cubic Meter

Convert liters to cubic meters with configurable decimal precision

Math, Date & Finance

Liter to Cup

Convert liters to US cups with configurable decimal precision

Math, Date & Finance

Liter to Gallon

Convert liters to US liquid gallons with configurable decimal precision

Math, Date & Finance

Liter to ML

Convert liters to milliliters with configurable decimal precision

Math, Date & Finance

Liter to Pint

Convert liters to US liquid pints with configurable decimal precision

Math, Date & Finance

Liter to Quart

Convert liters to US liquid quarts with configurable decimal precision

Math, Date & Finance

Logarithm Calculator

Calculate logarithms with any valid base, with optional log10, log2, and natural-log comparisons

Math, Date & Finance

Logistic Regression Calculator

Fit a binary logistic regression model with gradient descent and predict class probabilities

Math, Date & Finance

Mann-Whitney U Test Calculator

Compare two independent samples with the nonparametric Mann-Whitney U rank-sum test

Math, Date & Finance

Margin Calculator

Calculate profit margin, markup, and selling price based on cost and desired margin percentage

Math, Date & Finance

Margin of Error Calculator

Calculate the margin of error for a mean or proportion from sample size, confidence level, and variability

Math, Date & Finance

Markup Calculator

Calculate markup, selling price, and profit based on cost and markup percentage

Math, Date & Finance

Percentage Calculator

Solve common percentage questions including percentage of a total, value from a percentage, and percentage change

Math, Date & Finance

Matrix Calculator

Perform core matrix operations including addition, multiplication, inverse, determinant, trace, and rank

Math, Date & Finance

Matrix Inverse Calculator

Compute the inverse of a square matrix using Gauss-Jordan elimination and report when inversion is impossible

Math, Date & Finance

Matrix Multiplication Calculator

Multiply two matrices and return the product with dimension checks and optional step explanations

Math, Date & Finance

MB to Bytes

Convert megabytes to bytes using decimal storage units

Math, Date & Finance

MB to GB

Convert megabytes to gigabytes with decimal vs binary interpretation, alternate-system comparison, and transfer estimates

Math, Date & Finance

MCG to MG

Convert micrograms to milligrams with configurable decimal precision

Math, Date & Finance

McNemar Test Calculator

Test paired binary categorical changes with exact binomial or continuity-corrected chi-square McNemar test

Math, Date & Finance

Mean Absolute Deviation Calculator

Calculate mean absolute deviation around the mean or median for an easy-to-read spread measure

Math, Date & Finance

Mean Calculator

Calculate the arithmetic mean of a numeric dataset and review the main supporting statistics

Math, Date & Finance

Median Calculator

Find the median of a dataset, inspect the sorted sequence, and optionally review quartiles and interquartile range

Math, Date & Finance

Meter to Feet

Convert meters to feet with configurable decimal precision

Math, Date & Finance

Meter to Inches

Convert meters to inches with configurable decimal precision

Math, Date & Finance

Meter to KM

Convert meters to kilometers with configurable decimal precision

Math, Date & Finance

Meter to Mile

Convert meters to international miles with configurable decimal precision

Math, Date & Finance

Meter to Yard

Convert meters to yards with configurable decimal precision

Math, Date & Finance

Metric Ton to KG

Convert metric tons to kilograms with configurable decimal precision

Math, Date & Finance

MG to G

Convert milligrams to grams with configurable decimal precision

Math, Date & Finance

MG to MCG

Convert milligrams to micrograms with configurable decimal precision

Math, Date & Finance

Midrange Calculator

Calculate the midrange of a numeric dataset as the average of its minimum and maximum values

Math, Date & Finance

Mile to Feet

Convert miles to feet with configurable decimal precision

Math, Date & Finance

Mile to Meter

Convert international miles to meters with configurable decimal precision

Math, Date & Finance

Mile to Nautical Mile

Convert international miles to nautical miles with configurable decimal precision

Math, Date & Finance

Miles to KM

Convert miles to kilometers with configurable decimal precision

Math, Date & Finance

ML to Liter

Convert milliliters to liters with configurable decimal precision

Math, Date & Finance

ML to OZ

Convert milliliters to US fluid ounces with configurable decimal precision

Math, Date & Finance

MM to CM

Convert millimeters to centimeters with configurable decimal precision

Math, Date & Finance

MM to Inches

Convert millimeters to inches with configurable decimal precision

Math, Date & Finance

Mode Calculator

Find the most frequent value or values in a dataset and inspect the supporting frequency distribution

Math, Date & Finance

Modular Calculator

Perform modular arithmetic operations

Math, Date & Finance

Modulo Calculator

Compute the remainder of integer division, with optional normalization to the positive modulo form

Math, Date & Finance

Months to Days

Convert whole calendar months to exact days from a specified start year and month

Math, Date & Finance

MPH to KMH

Convert miles per hour to kilometers per hour with configurable decimal precision

Math, Date & Finance

MPH to Knot

Convert miles per hour to knots with configurable decimal precision

Math, Date & Finance

MPH to M/S

Convert miles per hour to meters per second with configurable decimal precision

Math, Date & Finance

M/S to KMH

Convert meters per second to kilometers per hour with configurable decimal precision

Math, Date & Finance

M/S to MPH

Convert meters per second to miles per hour with configurable decimal precision

Math, Date & Finance

Multiple Linear Regression Calculator

Fit a multiple linear regression model from rows of predictor variables and a numeric target

Math, Date & Finance

Natural Log Calculator

Calculate natural logarithms ln(x), with optional comparisons to log10 and the matching exponential form

Math, Date & Finance

Nautical Mile to Mile

Convert nautical miles to international miles with configurable decimal precision

Math, Date & Finance

Normal Distribution Calculator

Calculate z-scores, cumulative probability, tail probability, and interval probability for a normal distribution

Math, Date & Finance

Nth Root Calculator

Calculate nth roots with configurable degree, including odd roots of negative numbers

Math, Date & Finance

Number Converter

Convert numbers between different formats (decimal, binary, hexadecimal, octal)

Math, Date & Finance

Number Precision Adjuster

Adjust and format number precision, decimal places, and scientific notation with various rounding and padding options

Math, Date & Finance

Number Rounding Tool

Round numbers with precision control, supporting different rounding methods and batch processing

Math, Date & Finance

One Proportion Z Test Calculator

Run a one-proportion Z test from success count, trial count, and hypothesized population proportion

Math, Date & Finance

One Sample t Test Calculator

Run a one-sample t test from raw data or summary statistics, including p-value and confidence interval

Math, Date & Finance

One-Way ANOVA Calculator

Compare means across three or more independent groups with a one-way ANOVA F test

Math, Date & Finance

OZ to Cup

Convert US fluid ounces to US cups with configurable decimal precision

Math, Date & Finance

OZ to Grams

Convert ounces to grams with configurable decimal precision

Math, Date & Finance

OZ to LB

Convert ounces to pounds with configurable decimal precision

Math, Date & Finance

OZ to ML

Convert US fluid ounces to milliliters with configurable decimal precision

Math, Date & Finance

P Value Calculator

Calculate one-tailed or two-tailed p-values for Z, t, chi-square, and F test statistics

Math, Date & Finance

Pace Min/Km to KMH

Convert running pace in minutes per kilometer to kilometers per hour

Math, Date & Finance

Pace Min/Mile to MPH

Convert running pace in minutes per mile to miles per hour

Math, Date & Finance

Paired t Test Calculator

Run paired-sample t tests from before and after values or precomputed paired differences

Math, Date & Finance

Pascal's Triangle Generator

Generate Pascal's triangle with customizable number of rows

Math, Date & Finance

Pearson Correlation Calculator

Calculate Pearson r, r squared, covariance, and confidence interval for paired numeric data

Math, Date & Finance

Percent Error Calculator

Calculate percent error between an experimental value and a reference value

Math, Date & Finance

Percentage Calculator

Calculate percentages, percentage changes, and percentage relationships between numbers

Math, Date & Finance

Percentage Decrease Calculator

Calculate the percentage decrease between an original value and a new value

Math, Date & Finance

Percentage Increase Calculator

Calculate the percentage increase between an original value and a new value

Math, Date & Finance

Percentile Calculator

Calculate one or more percentiles for a numeric dataset with linear, nearest-rank, or exclusive methods

Math, Date & Finance

Percentile to Z-Score Calculator

Convert a normal percentile, tail area, or central area into a standard normal z-score

Math, Date & Finance

Perimeter Calculator

Calculate the perimeter of various geometric shapes

Math, Date & Finance

Permutation Calculator

Calculate permutations with or without repetition, plus circular arrangements, with formulas and optional steps

Math, Date & Finance

Pint to Liter

Convert US liquid pints to liters with configurable decimal precision

Math, Date & Finance

Poisson Distribution Calculator

Calculate exact, cumulative, and upper-tail Poisson probabilities from an expected event rate

Math, Date & Finance

Polynomial Calculator

Evaluate and analyze polynomials

Math, Date & Finance

Polynomial Regression Calculator

Fit a polynomial least-squares curve to paired numeric data and inspect coefficients, R squared, and predictions

Math, Date & Finance

Polynomial Roots Calculator

Find all real and complex roots of a polynomial from a coefficient list using a numerical root finder

Math, Date & Finance

Population Standard Deviation Calculator

Calculate population standard deviation from population variance using the n denominator

Math, Date & Finance

Population Variance Calculator

Calculate population variance with the n denominator for a complete numeric dataset

Math, Date & Finance

Power Calculator

Raise a base to any real exponent, with optional scientific notation and verification details

Math, Date & Finance

Pressure Unit Converter

Convert between different pressure units (pascal, bar, psi, atmosphere, etc.)

Math, Date & Finance

Prime Factorization Calculator

Factor any integer into its prime factors with detailed analysis and mathematical properties.

Math, Date & Finance

Prime Factorization Calculator

Break an integer into prime factors, show the factorization string, and optionally include divisor properties and factorization steps

Math, Date & Finance

Prime Number Checker

Check if a number is prime (a natural number greater than 1 that has no positive divisors other than 1 and itself)

Math, Date & Finance

Probability Calculator

Calculate union, independent intersection, complement, and at-least-one probabilities

Math, Date & Finance

Proportion Calculator

Solve proportion equations of the form a/b = c/d and calculate the missing term

Math, Date & Finance

Quadratic Equation Calculator

Solve quadratic equations, classify the roots, and return discriminant, vertex, and factor information

Math, Date & Finance

Quadratic & Linear Equation Solver

Solve quadratic equations ax² + bx + c = 0 and linear equations bx + c = 0 with detailed steps, discriminant analysis, vertex calculation, and axis of symmetry.

Math, Date & Finance

Quart to Gallon

Convert US liquid quarts to US liquid gallons with configurable decimal precision

Math, Date & Finance

Quart to Liter

Convert US liquid quarts to liters with configurable decimal precision

Math, Date & Finance

Quartile Calculator

Calculate Q1, median, Q3, interquartile range, and optional outlier fences for a numeric dataset

Math, Date & Finance

R-Squared Calculator

Calculate coefficient of determination R squared from actual and predicted values

Math, Date & Finance

Range Calculator

Calculate the statistical range of a numeric dataset from its minimum and maximum values

Math, Date & Finance

Ratio Calculator

Simplify ratios, calculate ratio shares, and convert between ratio, fraction, and decimal forms

Math, Date & Finance

Rational Number Calculator

Perform arithmetic operations on fractions

Math, Date & Finance

Regression Calculator

Run simple linear regression on paired numeric data and inspect slope, intercept, correlation, and predictions

Math, Date & Finance

Residual Calculator

Calculate residuals, absolute errors, SSE, MSE, and RMSE from actual and predicted values or a linear equation

Math, Date & Finance

Roman Numeral Converter

Convert between Arabic numbers and Roman numerals with validation and detailed results

Math, Date & Finance

Rounding Calculator

Round numbers to integers, decimal places, tens, or hundreds using a simple rounding mode selector

Data & Tables

Row Calculator

Perform calculations on each row and add new columns

Math, Date & Finance

Sample Size Calculator

Estimate required sample size for proportions or means using confidence level, margin of error, and optional finite population correction

Math, Date & Finance

Sample Standard Deviation Calculator

Calculate sample standard deviation from sample variance using the n - 1 denominator

Math, Date & Finance

Sample Variance Calculator

Calculate sample variance with the n - 1 denominator for estimating spread from a sample dataset

Math, Date & Finance

Scientific Calculator

Advanced scientific calculator with support for complex mathematical functions and expressions

Math, Date & Finance

Scientific Notation Calculator

Add, subtract, multiply, and divide values written in scientific notation, then return standard, scientific, and engineering forms

Math, Date & Finance

Scientific Notation Converter

Convert numbers between standard decimal format and scientific notation, with optional engineering notation output

Math, Date & Finance

Sequence Calculator

Calculate arithmetic, geometric, and Fibonacci sequences, including the nth term, the first terms, and the partial sum

Math, Date & Finance

Significant Figures Calculator

Count significant figures and round numbers to a target number of significant digits

Math, Date & Finance

Skewness Calculator

Calculate sample and population skewness to measure distribution asymmetry

Math, Date & Finance

Slope Intercept Calculator

Find slope, y-intercept, and line equation from two points or multiple paired observations

Math, Date & Finance

Spearman Correlation Calculator

Calculate Spearman rank correlation for paired numeric data with tied-rank handling

Math, Date & Finance

Speed Unit Converter

Convert between different speed units (m/s, km/h, mph, knot, mach, etc.)

Math, Date & Finance

Square CM to Square Inch

Convert square centimeters to square inches with configurable decimal precision

Math, Date & Finance

Square Feet to Acre

Convert square feet to acres with configurable decimal precision

Math, Date & Finance

Square Feet to Square Meter

Convert square feet to square meters with configurable decimal precision

Math, Date & Finance

Square Inch to Square CM

Convert square inches to square centimeters with configurable decimal precision

Math, Date & Finance

Square KM to Square Miles

Convert square kilometers to square miles with configurable decimal precision

Math, Date & Finance

Square Meter to Acre

Convert square meters to acres with configurable decimal precision

Math, Date & Finance

Square Meter to Hectare

Convert square meters to hectares with configurable decimal precision

Math, Date & Finance

Square Meter to Square Feet

Convert square meters to square feet with configurable decimal precision

Math, Date & Finance

Square Meter to Square Yard

Convert square meters to square yards with configurable decimal precision

Math, Date & Finance

Square Miles to Square KM

Convert square miles to square kilometers with configurable decimal precision

Math, Date & Finance

Square Root Calculator

Calculate square roots, check whether a value is a perfect square, and verify the squared result

Math, Date & Finance

Square Yard to Square Meter

Convert square yards to square meters with configurable decimal precision

Math, Date & Finance

Standard Deviation Calculator

Calculate sample and population standard deviation, variance, coefficient of variation, and sigma intervals

Math, Date & Finance

Standard Error Calculator

Calculate the standard error of the mean from raw sample values or summary statistics

Math, Date & Finance

Standard Normal Calculator

Calculate standard normal PDF, CDF, tail probability, two-tail probability, and central area from a z-score

Math, Date & Finance

Statistical Power Calculator

Estimate statistical power for one-sample mean or proportion tests using sample size, alpha, and expected effect

Math, Date & Finance

Statistics Calculator

Calculate statistical measures for numerical datasets including mean, median, mode, standard deviation, and more

Math, Date & Finance

Stone to KG

Convert stone to kilograms with configurable decimal precision

Math, Date & Finance

Stone to LB

Convert stone to pounds with configurable decimal precision

Math, Date & Finance

Study Time Calculator

Estimate total study hours, daily study targets, and schedule feasibility from topics, difficulty, and available time

Math, Date & Finance

Sum Calculator

Calculate sum of numbers with partial sums, cumulative sums, and statistics

Math, Date & Finance

Sum Of Series Calculator

Sum arithmetic series, geometric series, or a custom list of terms

Math, Date & Finance

T Distribution Calculator

Calculate Student t distribution PDF, CDF, tail probability, two-tail probability, and central area

Math, Date & Finance

T-Test Calculator

Run one-sample or two-sample t-tests from raw data and inspect t statistics, degrees of freedom, and p-values

Math, Date & Finance

Tablespoon to Teaspoon

Convert US tablespoons to US teaspoons with configurable decimal precision

Math, Date & Finance

Taylor Series Calculator

Calculate Taylor series expansion for common functions

Math, Date & Finance

Teaspoon to Tablespoon

Convert US teaspoons to US tablespoons with configurable decimal precision

Math, Date & Finance

Temperature Unit Converter

Convert between different temperature units (Celsius, Fahrenheit, Kelvin, Rankine)

Math, Date & Finance

Test Score Percentage Calculator

Convert points earned and total points into a test score percentage, points lost, and letter grade

Math, Date & Finance

Time Unit Converter

Convert between different time units (seconds, minutes, hours, days, weeks, etc.)

Math, Date & Finance

Tip Calculator

Calculate tips and split bills between multiple people with customizable tip percentages

Math, Date & Finance

Ton to LB

Convert US short tons to pounds with configurable decimal precision

Math, Date & Finance

Trigonometry Calculator

Calculate trigonometric functions (sin, cos, tan)

Math, Date & Finance

Trimmed Mean Calculator

Calculate a trimmed mean by removing the same percentage of low and high values before averaging

Math, Date & Finance

Two Proportion Z Test Calculator

Compare two independent proportions with a pooled two-proportion Z test and confidence interval

Math, Date & Finance

Two Sample t Test Calculator

Run an independent two-sample t test with pooled variance from raw data or summary statistics

Math, Date & Finance

Two-Way ANOVA Calculator

Analyze two categorical factors and their interaction with a two-way ANOVA table

Math, Date & Finance

Uniform Distribution Calculator

Calculate PDF, CDF, survival probability, and interval probability for a continuous uniform distribution

Math, Date & Finance

Variance Calculator

Calculate sample variance, population variance, and optional standard deviation for a numeric dataset

Math, Date & Finance

Vector Calculator

Perform core vector operations such as addition, subtraction, scaling, magnitude, normalization, angle, and distance

Math, Date & Finance

Volume Unit Converter

Convert between different volume units (liters, gallons, cups, cubic meters, etc.)

Math, Date & Finance

Water Bill Calculator

Calculate water costs based on usage and water rates

Math, Date & Finance

Weeks to Days

Convert weeks to days with configurable decimal precision

Math, Date & Finance

Weight Unit Converter

Convert between different weight units (kilograms, pounds, ounces, grams, etc.)

Math, Date & Finance

Weighted Average Calculator

Calculate a weighted average from paired values and weights, with contribution and normalized weight details

Math, Date & Finance

Weighted GPA Calculator

Calculate weighted GPA from credits, grades, and course rigor bonuses for honors, AP, or IB classes

Math, Date & Finance

Welch t Test Calculator

Run Welch two-sample t tests for independent groups with unequal variances from raw data or summary statistics

Math, Date & Finance

Wilcoxon Signed-Rank Calculator

Run a paired nonparametric Wilcoxon signed-rank test from paired samples or differences

Math, Date & Finance

Winsorized Mean Calculator

Calculate a winsorized mean by capping extreme low and high values before averaging

Math, Date & Finance

Yard to Feet

Convert yards to feet with configurable decimal precision

Math, Date & Finance

Yard to Inches

Convert yards to inches with configurable decimal precision

Math, Date & Finance

Yard to Meter

Convert yards to meters with configurable decimal precision

Math, Date & Finance

Years to Days

Convert whole calendar years to exact days from a specified start year

Math, Date & Finance

Z-Score Calculator

Calculate a z-score from a raw value using a dataset or manually entered mean and standard deviation

Math, Date & Finance

Z-Score to Percentile Calculator

Convert a z-score into normal-distribution percentile, tail probability, or central area

Math, Date & Finance

Z Test Calculator

Run one-sample Z tests for a mean with known population standard deviation or a single population proportion

Conversion

282 Tools

Access 282 online conversion tools to transform files, data formats, and code. Process files securely on our servers with automatic deletion after 6 hours.

Length

37 Tools

Access 37 online length tools to convert, calculate, and format physical and digital measurements. Process data securely on our servers with automatic file deletion.

Meter

29 Tools

Access 29 online meter tools to convert, calculate, and format meter-based measurements and data. Process files securely with automatic deletion after 6 hours.

Weight

31 Tools

Access 31 online weight tools to convert, calculate, and process weight measurements. Process data securely in your browser with automatic file deletion after 6 hours.

Volume

35 Tools

Access 35 online volume tools to convert, calculate, and manage volume measurements and data. Process files securely with automatic deletion after 6 hours.

Area

31 Tools

Access 31 online tools to calculate, convert, and analyze geometric areas and land measurements. Process data securely on our servers with automatic file deletion.