VAT Calculator
Add VAT to a net price or remove VAT from a gross price at any rate.
What does the Percentage Calculator do?
Percentages compare a number to 100, which makes them handy for discounts, tips, grades, growth and budgets. This percentage calculator covers the three questions people ask most: what is X% of a number, what percentage one number is of another, and by what percentage a value has increased or decreased. Each answer comes with the formula, so you can check the working.
How to use the Percentage Calculator
- Pick the calculation that matches your question.
- Type the two numbers. Results appear as you type.
- Read the formula under the answer to see how it was worked out.
Your privacy
All calculations run in your browser. The numbers you enter are not sent or stored anywhere.
Frequently asked questions
How do I calculate a percentage of a number?
Divide the percentage by 100 and multiply by the number. For example, 15% of 80 is 0.15 × 80 = 12.
How do I calculate percentage increase?
Subtract the original value from the new value, divide by the original value and multiply by 100. Going from 80 to 100 is (100 − 80) ÷ 80 × 100 = 25% increase.
Why isn’t a 20% increase reversed by a 20% decrease?
Because each percentage is taken from a different starting value. 100 increased by 20% is 120, but 20% of 120 is 24, so decreasing by 20% gives 96 — not 100.
What is the difference between percentage and percentage points?
A change from 10% to 12% is a rise of 2 percentage points, but a 20% increase relative to the original 10%. Use percentage points when comparing two percentages directly.