CalculatorsInstant
Percentage Calculator
Find X% of Y, calculate percentage change, or discover what percent one number is of another — three modes, instant results.
Examples
See what this tool can do.
Work out a discount
Find 20% off a price in one step.
Measure growth
Calculate the percent change between last month and this month.
Tips & tricks
Get the most out of it.
- 1Use percent-change for increases and decreases over time.
- 2'What percent of' answers questions like scores out of a total.
- 3Results update as you type — no need to press calculate.
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About Percentage Calculator
What this tool does
Percentage Calculator finds a percentage of a number, works out percent change, and tells you what percent one value is of another.
How to use it
- Pick the calculation you need.
- Enter your numbers.
- Read the result instantly.
How it works
Each mode applies the standard formula — part÷whole×100, whole×percent÷100, or (new−old)÷old×100 — computed live as you type.
Privacy
This tool runs entirely in your browser. Nothing you enter is uploaded to a server.
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Frequently asked questions
Subtract the old value from the new, divide by the old value, then multiply by 100. The tool does this for you in the percent-change mode.