How do I calculate X% of a number?

Multiply the number by the percentage and divide by 100. For example, 15% of 80 is 80 x 15 / 100 = 12.

How do I find what percent one number is of another?

Divide the first number by the second and multiply by 100. For example, 20 out of 80 is 20 / 80 x 100 = 25%.

What is the difference between percentage points and percent?

From 10% to 12% is a 2 percentage point increase, but a 20% relative increase (2 / 10). The calculator shows both interpretations.

Percentage Calculator — Percent of a Number

Work out percentages in any direction — find X% of a number, what percent one number is of another, and percentage increases or decreases.

How percentages work

A percentage is a way of expressing a part out of one hundred. To find X% of a number, multiply the number by X and divide by 100. To find what percent one number is of another, divide the first by the second and multiply by 100. These two operations cover most everyday percentage questions: discounts, tips, taxes, interest and statistics.

One subtlety people get wrong: going from 10% to 12% is a 2 percentage point increase, but a 20% relative increase. When comparing percentages, always check which one you are actually measuring — the difference matters in finance, health and news reporting.

Common percentage uses

Discounts: 20% off $80 = $64
Sales tax: 8% tax on $50 = $4
Tips: 18% of a $90 bill = $16.20
Growth: a value rising from 200 to 250 grew 25%

Percentage Calculator

How percentages work

Common percentage uses

Frequently asked questions

Related calculators