5 calculation methods · instant result

Percentage Calculator

Calculate percentages, percentage change, discounts and original values with a clear formula and visual comparison.

What do you want to calculate?

Choose a situation – labels and formulas update automatically.

⌨ Enter the numbers

Quick values:

Formula used—The calculator updates automatically while you type.

◎ Result

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—proportion

Part—

Whole—

Difference—

Ratio—

Rounded—

Practical examples

Popular percentage calculations

Select an example to load it into the calculator.

How to calculate percentages

How do you calculate a percentage of a number?

Multiply the number by the percentage and divide by 100. For example, 15% of 240 is 36. This is useful for discounts, tips, tax and commission.

How do you work out percentage change?

Subtract the original value from the new value, divide by the original value and multiply by 100. A positive result is growth; a negative result is a decrease.

How do you reverse a percentage?

To find a price before a discount, divide the discounted price by 1 minus the discount rate. A price of £80 after 20% off originally cost £100.

Percentage points vs percentage change

A move from 20% to 25% is 5 percentage points, but the relative percentage increase is 25%. The calculator uses relative change in percentage-change mode.

How to calculate percentages – FAQ

How do I calculate 20% of a number?

Multiply the number by 0.20. For example, 20% of 150 is 30.

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

Divide the first number by the second and multiply by 100.

Can a percentage be greater than 100%?

Yes. If a part is larger than the reference whole, the result can exceed 100%.

How do I remove VAT or a discount from a price?

Use the original-value mode. Dividing is required; simply subtracting the same percentage gives the wrong result.

Does the calculator support decimals?

Yes. You can enter decimal values and results are displayed with up to two decimal places.