Percentages come up everywhere — discounts, tips, tax, test scores and interest. This finds a percentage of a number instantly: enter the percentage and the value. The note also reminds you of the reverse calculation, so you can work out what one number is as a percentage of another whenever you need it.
Numbers made easy
Handy kit.
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Frequently asked questions
How do I calculate a percentage of a number?
Divide the percentage by 100 and multiply by the number. For example, 20% of 150 is 0.20 times 150, which is 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 out of 150 is 30 divided by 150 times 100, which is 20 percent.