Percentage Calculator
Work out X% of a number, a share of a total, a change between two values, a discount or the price before an increase.
Processed in your browserFree
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About this tool
Every common percentage question, each in its own box: how much is 20% of 150, what percentage 30 is of 150, the change between two values, the price after a 30% discount, and what the price was before a 20% increase. Results update as you type; comma or point decimal separators are both accepted.
How to use this tool
- 1Pick the box that matches your question.
- 2Enter the values (comma or point decimals).
- 3Read the result, updated instantly.
Limits to know
- Results are rounded to two decimal places (four for small values).
- The change is undefined when the starting value is 0.
- Files
- No file to import: everything happens on the page.
Privacy and file processing
Calculations run instantly in your browser; nothing you enter is transmitted or stored.
Read our privacy policyFrequently asked questions
Use the last box, "Find the value before a change", with a change of +20 (or the VAT tool, which handles all the French rates).