Math & Numbers
Calculate square roots, check whether a value is a perfect square, and verify the squared result
square-root-calculatorMath & Numbers
Add, subtract, multiply, and divide values written in scientific notation, then return standard, scientific, and engineering forms
scientific-notation-calculatorMath & Numbers
Convert numbers between standard decimal format and scientific notation, with optional engineering notation output
scientific-notation-converterMath & Numbers
Estimate required sample size for proportions or means using confidence level, margin of error, and optional finite population correction
sample-size-calculatorMath & Numbers
Run one-sample or two-sample t-tests from raw data and inspect t statistics, degrees of freedom, and p-values
t-test-calculatorFinance
Calculate profit/loss for stock call and put options
stock-option-calculatorMath & Numbers
Calculate sum of numbers with partial sums, cumulative sums, and statistics
sum-calculatorMath & Numbers
Advanced scientific calculator with support for complex mathematical functions and expressions
scientific-calculatorMath & Numbers
Calculate statistical measures for numerical datasets including mean, median, mode, standard deviation, and more
statistics-calculatorMath & Numbers
Convert between different speed units (m/s, km/h, mph, knot, mach, etc.)
speed-converterFinance
Calculate sales tax and final price for purchases
sales-tax-calculatorFinance
Estimate investment doubling time using the Rule of 72 and other investment rules
rule-of-72