Free calculator
Percentage Calculator
Calculate percentages instantly. Choose the calculation you need, enter two values, and see the result and equation.
3020% of 150 = 30
Percentage formulas
X% of Y: Y × X ÷ 100. X is what percent of Y: X ÷ Y × 100. Percent change: (new − original) ÷ |original| × 100.
How to use this calculator
Select the type of percentage problem, enter your two known values, and the calculator will update the answer. For explanations, worked examples and common percentage mistakes, read our guide to calculating percentages.
Source & methodology
The calculator’s core percent modes follow standard percent equations; percent-change mode follows the usual earlier-value baseline.