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Percentage Calculator

Three calculations in one: X% of Y, what percent one number is of another, and percentage change.

  1. Pick the calculation you need
  2. Enter the numbers
  3. Read the result

What is X% of Y?

20% of 150 is 30

X is what % of Y?

30 is 20.00% of 150

% change from X to Y

Increase of 20.00%

Frequently asked questions

How do I calculate X% of Y?
Multiply Y by X, then divide by 100 — enter both numbers in the "X% of Y" section and the result updates as you type.
How do I find what percent one number is of another?
Divide the first number by the second and multiply by 100. Enter the two numbers in that section and the calculator does the division for you.
How is percentage change calculated?
It takes (new value − old value) ÷ old value × 100. A positive result is an increase, a negative result is a decrease.
Does this tool store the numbers I enter?
No. Everything is calculated instantly in your browser and nothing you type is sent anywhere or saved.
Do I need to install anything or sign up?
No. It runs entirely in your browser — no software install, no account, no email required.
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