Calculate the power transmitted by a rotating shaft. P = T·ω = 2π·n·T/60. Solve power from torque and speed, or torque from power and speed. Supports W/kW/hp.

Finance

Salary Converter

Convert between hourly, monthly, and annual salary. Enter any one figure and get the other two, with customizable hours per week, weeks per year, and overtime multiplier. Shows paycheck estimates for weekly, biweekly, semimonthly, and monthly pay periods.

Finance

Savings Goal Calculator

Solve for the monthly contribution needed to reach a savings goal (with interest and compounding), or for the time required to reach the goal with a fixed monthly deposit. Optional inflation adjustment. Uses monthly compounding rollup.

Math & Numbers

Sample Standard Deviation Calculator

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

Math & Numbers

Sample Variance Calculator

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

Math & Numbers

Sequence Calculator

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

Math & Numbers

Scientific Notation Calculator

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

Math & Numbers

Scientific Notation Converter

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

Math & Numbers

Sample Size Calculator

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

Math & Numbers

Scientific Calculator

Advanced scientific calculator with support for complex mathematical functions and expressions

Finance

Sales Tax Calculator

Calculate sales tax and final price for purchases

Finance

Rule of 72 Calculator

Estimate investment doubling time using the Rule of 72 and other investment rules