Percentage Calculator
Calculate percentages instantly — find percent of a number, percentage change, percentage increase or decrease, and more.
Changing currency changes the unit and formatting only; it does not convert the amounts.
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About this tool
What it does
Calculates percentages, percentage changes, and what percentage one number is of another. Three calculators covering the most common percentage problems.
Who it's for
Students, business owners, shoppers, finance workers — anyone needing quick percentage calculations. Works with any currency or unit.
Your privacy
All calculations happen in your browser. Nothing is stored or transmitted.
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Frequently asked questions
How do I calculate a percentage of a number online?
Enter your number and percentage in the first calculator above — "What is X% of Y?" — and the result appears instantly. For example, 20% of 150 = 30. No sign up or download required, completely free to use.
How do I calculate percentage increase or decrease?
Use the percentage change calculator above. Enter the original value and the new value — it shows the percentage increase or decrease automatically. For example, from 80 to 100 is a 25% increase. From 100 to 75 is a 25% decrease.
What is 20% of my salary?
Enter your salary and 20 in the percentage calculator above for an instant result. As a quick reference: 20% of £30,000 = £6,000. 20% of £50,000 = £10,000. 20% of £100,000 = £20,000. This is commonly used for pension contributions, savings targets and tax estimates.
How do I calculate VAT, sales tax or GST?
Use the rate that applies to the transaction. To add a tax rate r%, multiply the net amount by (1 + r/100). To isolate tax from a tax-inclusive amount, divide by (1 + r/100), then subtract the net amount. Rates and taxable categories vary by jurisdiction, so verify the current rate with the relevant tax authority or use the VAT & GST Calculator.
How do I calculate a pay rise percentage?
Subtract your old salary from your new salary, divide by your old salary, then multiply by 100. For example, going from £30,000 to £33,000 = (3,000 ÷ 30,000) × 100 = 10% pay rise. Use the percentage change calculator above.
How do I work out a percentage of a test score?
Divide your score by the total marks and multiply by 100. For example, 72 out of 90 = (72 ÷ 90) × 100 = 80%. Enter your numbers in the "what percentage is X of Y" calculator above.
How do I calculate percentage increase?
Percentage increase = ((New Value − Old Value) ÷ Old Value) × 100. For example, from 80 to 100 = ((100−80) ÷ 80) × 100 = 25% increase. Use the percentage change calculator above for instant results.
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