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.
Answer the everyday percentage questions in one place. Work out what X% of Y is, what percent one number is of another, or the percent increase or decrease between two values, with the answer updating as you type.
Read the guide: How to Calculate Percentages (Three Common Ways)What do you need?
15% of 200
30
How it works
- 1
Pick the question
Choose percent-of, what-percent, or percent change.
- 2
Enter two numbers
Fill in the two values the chosen question needs.
- 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.
- How do I calculate a percentage of a number?
- Multiply the number by the percent as a decimal. For 20% of 150, multiply 150 by 0.20 to get 30. Pick the percent-of mode above and it does the arithmetic for you.
Important
For information and planning only — not financial, tax or legal advice. These figures are estimates; rates, fees and rules vary, so confirm anything that affects a real decision with a qualified professional or the official source.
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