Maths tool
Percentage Calculator
Find a percentage of a number, compare two values, calculate a percentage change or work out a discounted price.
Percentage basics
Which calculation do I need?
A percentage means “out of 100”. For example, 15% of 200 is 30. You can use the same maths with prices in pounds or dollars, quantities or other numbers.
How do I work out a sale price?
Choose “Discount / subtract a percentage”, enter the original price and the discount rate. A 20% discount on 80 saves 16, leaving 64 to pay.
Why is an increase different from the reverse decrease?
The starting value changes. Going from 80 to 100 is a 25% increase. Going from 100 back to 80 is a 20% decrease.
What is the difference between percent and percentage points?
A rate rising from 10% to 15% increases by 5 percentage points, but by 50% relative to the original rate. Enter 10 and 15 in the percentage-change calculation to find that relative change.
Can a result be more than 100%?
Yes. For example, 300 is 150% of 200. A discount is limited to 100% here so the final price cannot fall below zero.
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Good to know
How this tool works
Find a percentage of a number, compare two values, calculate a percentage change or work out a discounted price. Work through the labelled controls, review the result in the preview and reset the tool whenever you want to begin again.
Frequently asked questions
What is Percentage Calculator useful for?
Work out percentages, changes, increases and discounts. Check the entered units and rounding, especially when the result will be used in another calculation.
Is my information stored?
This tool works in your browser. The information you enter is not sent to us or saved in an account by this tool.
How accurate is the result?
The calculation follows the assumptions shown on the page. Rounding, provider methods and real-world charges can produce small differences.