Percentage Calculator

What is X% of Y?

e.g. What is 20% of 150?

X% × Y = ?

What is % of ?

Answer

X is what % of Y?

e.g. 30 is what % of 150?

X ÷ Y × 100 = ?%

is what % of ?

Answer

Percentage change

e.g. From 80 to 100 is what % increase?

(New − Old) ÷ Old × 100

From to

Change

Add a percentage

e.g. 200 + 15% = ?

Number × (1 + %/100)

+ %

Result

Subtract a percentage

e.g. 200 − 15% = ?

Number × (1 − %/100)

− %

Result

Percentage of total

e.g. 45 out of 200 students passed

Part ÷ Total × 100

out of

Percentage

How to use the percentage calculator

Our free percentage calculator covers six different percentage calculations on one page — from finding what percentage one number is of another, to calculating percentage increase and decrease, adding and subtracting percentages, and finding a percentage of a total. No need to remember formulas — just enter your numbers and get instant results.

How is it calculated?

Percentages are calculated using simple formulas depending on the type of calculation. To find X% of Y: multiply Y by X/100. To find what percentage X is of Y: divide X by Y and multiply by 100. For percentage change: subtract the old value from the new, divide by the old value, and multiply by 100.

Frequently asked questions

How do I calculate a percentage of a number?

To find X% of a number, multiply the number by X and divide by 100. For example, 20% of 150 = 150 × 20 ÷ 100 = 30. Or simply move the decimal point and multiply.

How do I calculate percentage increase?

Percentage increase = ((New Value − Old Value) ÷ Old Value) × 100. For example, going from 80 to 100 is (100−80) ÷ 80 × 100 = 25% increase.

How do I calculate percentage decrease?

Percentage decrease = ((Old Value − New Value) ÷ Old Value) × 100. For example, going from 100 to 75 is (100−75) ÷ 100 × 100 = 25% decrease.

What is 15% of 200?

15% of 200 = 200 × 15 ÷ 100 = 30. Our calculator gives you the answer instantly — just enter 15 in the percentage field and 200 in the number field.

How do I add VAT (20%) to a price?

To add 20% VAT to a price, multiply by 1.2. For example, £100 + 20% VAT = £100 × 1.2 = £120. Use our "Add a percentage" calculator to do this instantly for any rate.

How do I calculate a tip percentage?

To calculate a tip, multiply the bill amount by the tip percentage divided by 100. For a 15% tip on a £50 bill: £50 × 0.15 = £7.50. Or use our dedicated tip calculator to split the bill too.