Free Online Tool

Percentage
Calculator

01 — Part of a whole

What is % of ?

02 — Reverse percentage

is what percent of ?

03 — Increase / decrease

From to

Tab to advance · Shift+Tab to go back · Enter to calculate

About & FAQ

What is a percentage?

A percentage expresses a number as a fraction of 100. For example, if 25 out of 100 cars are white, that's 25%. The symbol "%" makes proportional comparisons fast and intuitive.

How do you calculate a percentage?

Divide the part by the whole, then multiply by 100. If 20 of your 50 apples are red: 20 ÷ 50 = 0.4, then × 100 = 40%.

Why do percentages matter?

Percentages appear everywhere — discounts, taxes, stock changes, economic indicators. A solid grasp of how they work helps you make sharper decisions in finance, business, and everyday life.