Percentage calculator

Three common percentage calculations in one place. Results update as you type.

What is % of ?
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is what % of ?
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Percentage change from to
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Questions

How do I calculate a percentage of a number?

Multiply the number by the percentage and divide by 100. For example, 15% of 200 is 200 × 15 ÷ 100 = 30.

How do I find what percent one number is of another?

Divide the first number by the second and multiply by 100. For example, 30 is 15% of 200.

How is percentage change calculated?

Subtract the old value from the new value, divide by the old value, and multiply by 100. A positive result is an increase and a negative result is a decrease.

Is anything sent to a server?

No. All the calculations run in your browser.