Free calculator

Percentage Calculator

Calculate percentages instantly. Choose the calculation you need, enter two values, and see the result and equation.

Calculation

Percentage (%)Number

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

NIST defines the percent symbol as representing the number 0.01.

U.S. source : NIST — Guide to the SI.

Local source

U.S. source : NIST — Guide to the SI