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% Percentage Calculator Online — Free

Three percentage tools on one page: find a percent of a number, find what percent one number is of another, or find the increase or decrease between two numbers.

100% FREENO SIGN-UPINSTANT RESULTS

A. What is X% of Y?

B. X is what percent of Y?

C. Percentage increase / decrease

How to use this tool

  1. Pick the mode you need: percent of a number, what percent, or increase / decrease.
  2. Type the two numbers in that box.
  3. Press its Calculate button — the answer appears instantly below the box.

Frequently asked questions

How do I calculate percent of a number?

Multiply the number by the percent and divide by 100. For example, 20% of 150 = 150 x 20 / 100 = 30.

How do I find what percent X is of Y?

Divide X by Y and multiply by 100. For example, 30 is (30 / 150) x 100 = 20% of 150.

How do I calculate percentage increase?

Subtract the old number from the new number, divide by the old number, and multiply by 100. For example, 100 to 150 is (150 - 100) / 100 x 100 = 50% increase.

What is the percent formula?

Percent = (part / whole) x 100. All three tools on this page use this one formula in different directions.

What is the difference between percent and percentage points?

If something rises from 20% to 25%, that is a 5 percentage-point rise — but a 25% increase relative to 20. The increase/decrease tool shows the relative percent.

Can I use this for discounts and marks?

Yes — shoppers use it for discounts (e.g. 25% off 800), and students use it for marks (e.g. 45 out of 60 = 75%).

🔒 Your privacy: Your numbers never leave your device — everything is calculated in your browser.

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