Percentage Calculator

Four percentage calculators in one - percentages of, percentage of a total, percentage change, and add/subtract.

What is X% of Y?

e.g. What is 15% of 200?

Percentage

Of number

X is what % of Y?

e.g. 30 is what % of 200?

Value (X)

Total (Y)

Percentage change

e.g. From 80 to 100 = +25%

From

Add or subtract a percentage

e.g. 200 + 15% = 230

Number

Percentage

About this tool

Solve any percentage problem instantly - find what percentage one number is of another, calculate percentage increase or decrease, find X% of a number, or work backwards from a percentage to the original value. Four calculation modes cover every common percentage scenario, from discounts and VAT to growth rates and exam scores.

How to Calculate Percentages Online

1Select the calculation type: % of number, % change, what %, or find original.
2Enter the values in the input fields.
3The result appears instantly with the formula shown.
4Click 'Swap' to reverse the calculation.

Frequently Asked Questions

How do I calculate a percentage of a number?+

Use the 'X% of Y' mode. For example, 20% of 150 = 30. The formula is: (percentage divided by 100) multiplied by number.

How do I calculate percentage increase?+

Use 'Percentage change' mode. Formula: ((new value minus old value) divided by old value) multiplied by 100. A positive result is an increase; negative is a decrease.

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

Use 'X is what % of Y?'. For example, 45 is what percent of 180? Answer: (45 divided by 180) multiplied by 100 = 25%.

How do I calculate the original price before a discount?+

Use 'Find original value'. If the discounted price is £80 after a 20% discount: original = 80 divided by (1 minus 0.20) = £100.

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