Percentage Calculator

Six ways to calculate percentages — find a percentage, increase, decrease, difference and more.

What is X% of Y?

What is % of = —

X is what percent of Y?

is what % of = —

Percentage Increase / Decrease

From to = —

Increase / Decrease X by Y%

by % = —

Percentage Difference between two numbers

Difference between and = —

X% of what number is Y?

% of what is = —

Common Percentage Shortcuts

10% of a number

Divide by 10

5% of a number

Half of 10%

1% of a number

Divide by 100

25% of a number

Divide by 4

50% of a number

Divide by 2

75% of a number

50% + 25%

20% of a number

Divide by 5

15% tip

10% + 5%

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How to Use Percentage Calculator

To calculate a percentage, choose the calculation type you need from the available modes: find what percentage one number is of another, calculate a percentage of a number, find the original value before a percentage increase or decrease, or calculate the percentage change between two values.

Enter your known values into the input fields and the result is calculated instantly. All four common percentage calculation modes are available on one page, so you do not need to rearrange the formula yourself. This tool is useful for finance, exam scores, discounts, statistics, and everyday math.

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Frequently Asked Questions

How do I calculate what percentage X is of Y? expand_more

Divide X by Y and multiply by 100. For example, 25 is what percentage of 200? Answer: (25 ÷ 200) × 100 = 12.5%.

How do I calculate a percentage of a number? expand_more

Multiply the number by the percentage and divide by 100. For example, 15% of 80 = (15 × 80) ÷ 100 = 12.

How do I calculate percentage increase? expand_more

Subtract the original value from the new value, divide by the original value, and multiply by 100. For example, from 50 to 75: ((75 − 50) ÷ 50) × 100 = 50% increase.

How do I find the original price before a percentage discount? expand_more

Divide the discounted price by (1 minus the discount rate). For example, if the sale price is £80 after a 20% discount, the original price = 80 ÷ (1 − 0.20) = £100.

What is the percentage difference between two numbers? expand_more

Percentage difference = |A − B| ÷ ((A + B) ÷ 2) × 100. This is used when comparing two values without a clear 'original' and 'new' direction.

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