General · Utility

Percentage calculator.

Three modes in one tool: find X% of a number, find what percentage one number is of another, or calculate the percentage change between two values.

Inputs

Mode

Calculation

X% of Y

Percentage

Of number

Result

Fill the form and press Calculate.

Understanding percentages

A percentage is a number expressed as a fraction of 100. The word "percent" literally means "per hundred." This tool covers the three most common percentage calculations.

Formulas

X% of Y = (X / 100) × Y
X is what % of Y = (X / Y) × 100
% change = ((New − Old) / Old) × 100