Percentage Calculator
Three common percentage problems solved instantly. Change any number and the answer updates.
What is X% of Y?
What is % of ?
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X is what percent of Y?
is what % of ?
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Percentage change
From to
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How to use it
- Pick the question that matches your problem.
- Type your numbers into the boxes.
- Read the answer under the boxes. It updates as you type.
About this tool
To find a percentage of a number, multiply the number by the percentage and divide by 100. To find what percent A is of B, divide A by B and multiply by 100. Percentage change is the difference between the new and old value, divided by the old value.
Frequently asked questions
How do I calculate 20% of 150?
Multiply 150 by 20 and divide by 100. The answer is 30.
How do I work out a discount?
Find the percent of the price, then subtract it. 25% off 80 is 80 minus 20, which is 60.
What is percentage change?
It is the new value minus the old value, divided by the old value, times 100.
Why does it say Not defined?
Dividing by zero has no answer. Check that the second number is not 0.