Percentage Calculator

Four common percentage calculations in one place. Pick the mode that matches what you need and get the result instantly as you type.

What is X% of Y?

% of
Result —

X is what percent of Y?

is what % of
Result —

Percentage change from X to Y

to
Change —

Apply X% to Y

% of
Increase —
Decrease —

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Frequently Asked Questions

How do I calculate a percentage of a number?

Multiply the number by the percentage and divide by 100. For example, 20% of 150 = (20 ÷ 100) × 150 = 30. Use the "What is X% of Y?" mode above.

How do I calculate what percentage one number is of another?

Divide the first number by the second and multiply by 100. For example, 30 is what percent of 150? (30 ÷ 150) × 100 = 20%. Use the "X is what percent of Y?" mode above.

How do I calculate percentage increase or decrease?

Subtract the original from the new value, divide by the original, and multiply by 100. For example, from 80 to 100: ((100 − 80) ÷ 80) × 100 = 25% increase. A negative result means a decrease.

How do I apply a percentage increase or decrease?

For an increase: multiply the original by (1 + percent ÷ 100). For a decrease: multiply by (1 − percent ÷ 100). For example, a 15% increase on 200 = 200 × 1.15 = 230.

What does a negative percentage change mean?

A negative percentage change means the value decreased. For example, going from 100 to 75 is a −25% change (a 25% decrease).