Percentage Calculator

Three everyday percentage questions, answered as you type.

100% LocalFree

What is% of?–

is what percent of?–

Fromto= change of–

How to use this calculator

1 Pick the row that matches your question. The first row answers “what is X% of Y”, for example a 15% tip on a 40 euro bill.
2 The second row tells you what percent one number is of another, for example 45 correct answers out of 60 questions.
3 The third row shows the percentage change between two values, for example a price that went from 80 to 95. A negative result means a decrease.
4 Results update as you type. You can use your local decimal format, for example 12.5 or 12,5.

How do I calculate a percentage of a number?: Multiply the number by the percentage and divide by 100. For example, 20% of 150 is 150 × 20 ÷ 100 = 30. The first row of the calculator does exactly this.
How do I work out what percent A is of B?: Divide A by B and multiply by 100. For example, 30 out of 120 is 30 ÷ 120 × 100 = 25%. Use the second row for this.
How is percentage change calculated?: Subtract the old value from the new value, divide by the old value, and multiply by 100. Going from 80 to 100 is a 25% increase; going from 100 to 80 is a 20% decrease. Note that the two directions give different percentages because the starting value differs.
What is the difference between percentage points and percent?: If an interest rate rises from 2% to 3%, it rose by one percentage point, but by 50 percent relative to where it started. This calculator works with percent, the relative measure.
Is my data sent anywhere?: No. The calculation runs entirely in your browser; the numbers you type never leave your device.

Sale prices and savings, worked out as you type.

See how money grows when interest earns interest.

Paste your numbers, get mean, median and more.