Percentage Calculator

Solve the everyday percentage questions in one place: what is X% of Y, X is what percent of Y, and the percent change between two numbers.

Read the guide: How to Calculate Percentages (Three Common Ways)

What do you need?

15% of 200

30

How it works

  1. 1

    Pick the question

    Choose percent-of, what-percent, or percent change.

  2. 2

    Enter two numbers

    Fill in the two values the chosen question needs.

  3. 3

    Read the answer

    The result updates as you type.

Instant & 100% private — nothing is uploaded

Every calculation runs locally in your browser. The income, balances and goals you enter stay on your own device and are never sent to a server — nothing is stored, logged or shared.

Frequently asked questions

How is percent change calculated?
It is the difference between the two numbers divided by the starting number, times 100. A positive result is an increase, a negative one a decrease.
What does "X is what percent of Y" mean?
It tells you what share one number is of another — for example, 30 is 15% of 200. Useful for scores, tips and proportions.