Math calculators
Math
Percentage relationships, percent change, fractions, unit conversion, and a bounded scientific calculator.
In this topic
Calculators
01Percentage CalculatorWhat is X% of Y, X is what percent of Y, or X is Y% of what. Division by zero is rejected.02Percent Change CalculatorPercentage increase or decrease from an original value to a new value. A zero baseline is not defined.03Scientific CalculatorPowers, roots, logs, factorials, and trig in degrees or radians, with π and e, on a keypad that follows the normal order of operations.04Fraction CalculatorAdd, subtract, multiply, divide, and simplify fractions with exact integer arithmetic, then show mixed and decimal forms.05Unit Conversion CalculatorConvert length, mass, volume, area, temperature, and speed through canonical base units, so every conversion runs through one tested path.
How these are built
Every calculator shows its work.
Each one names the formula it used, and the dated official source behind any figure it did not get from you.
How the numbers work →