100% free business tool

Percentage Calculator

Percentages, ratios and percentage increase or decrease between two numbers.

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Works on any device

Percentage

Of number

Result

—

Enter both numbers.

Private by design. Everything happens in your browser. Your files never leave your device.

100% freeNo hidden charges, no watermark
Instant resultsDone in seconds, no queue
Secure & privateNothing is uploaded
Works on all devicesDesktop, tablet and mobile

How to use the Percentage Calculator

1Type in your numbers.
2Read the result - it updates as you type.
3Copy or print it if you need a record.

About the Percentage Calculator

Three calculations in one: a percentage of a number, what percentage one number is of another, and the increase or decrease between two values. The third is the one people usually get wrong by hand.

The three percentage formulas

X% of Y = Y × X ÷ 100. 15% of 80 is 12.
X is what % of Y = X ÷ Y × 100. 12 out of 80 is 15%.
Change from A to B = (B − A) ÷ A × 100. From 80 to 92 is a 15% increase.

Percentage points vs percent

If an interest rate goes from 4% to 5%, it has risen by one percentage point - but by 25 percent. Both are correct, and mixing them up is the most common percentage mistake in news and reports.

Discounts, tax and loans

A 20% discount followed by 20% off again is a 36% discount, not 40%. Adding or removing VAT has its own trap - use the VAT calculator, which divides correctly. For interest over time, the loan calculator shows the full schedule.

Frequently asked questions

How do I calculate the percentage change between two numbers?+

Subtract the old value from the new one, divide by the old value and multiply by 100. From 80 to 100 is (100 - 80) / 80 × 100 = 25% up. Enter the two numbers here and it is worked out for you.

What can it calculate?+

Three things: a percentage of a number, what percentage one number is of another, and the increase or decrease between two values.

How do I work out a percentage increase?+

Use the third calculation and enter the old value first, then the new one. It divides the difference by the original - the step people most often get backwards by hand.

Why is a 50% rise followed by a 50% fall not back to the start?+

Because each percentage applies to a different base. 100 rises to 150, then 50% of 150 is 75. Percentages do not cancel out, which is exactly why this is worth checking.