Percentage Calculator
Find a percentage of a number, what percent one number is of another, and percentage increase or decrease.
Find a percentage of a number
% of=30
What percent one number is of another
is what % of=20%
Percentage change between two numbers
to=+20%
Frequently Asked Questions
How do I find a percentage of a number?+
Multiply the number by the percentage divided by 100. For example, 20% of 150 is 150 × 0.20 = 30. The first calculator does this for you — enter the percentage and the number.
How do I work out what percent one number is of another?+
Divide the part by the whole and multiply by 100. For example, 30 out of 150 is (30 ÷ 150) × 100 = 20%. Use the second calculator for this.
How is percentage change calculated?+
Subtract the old value from the new value, divide by the old value, and multiply by 100. From 150 to 180 is ((180 − 150) ÷ 150) × 100 = +20%. A negative result means a decrease. Use the third calculator.
Is anything I enter sent to a server?+
No. All three calculations run entirely in your browser. Nothing you type is uploaded or stored.
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How to use
- Each card answers one common percentage question.
- Type into the fields and the result updates instantly.