Math calculators

Percentages, fractions and everyday math, with every step shown.

Each with the formula, a worked example and sources.

• Average CalculatorMean, median, mode and range of a list of numbers, with the steps.
• Fraction CalculatorAdd, subtract, multiply or divide fractions and mixed numbers, step by step.
• Percent Change CalculatorPercent increase or decrease from an old value to a new one, plus percent difference.
• Percent Error CalculatorHow far a measured value is from the accepted value, as a percentage.
• Percentage CalculatorPercent of a number, what percent one number is of another, and percent change.
• Ratio CalculatorSimplify a ratio to lowest terms, or scale it to find a missing value.
• Rounding CalculatorRound to decimal places, significant figures or the nearest 10, 100 or any multiple, with any rounding rule.
• Scientific Notation CalculatorConvert numbers to and from scientific, E and engineering notation, with significant figures.
• Standard Deviation CalculatorSample and population standard deviation and variance, with a step-by-step table.