Percentage Increase Calculator
Add or remove a percentage from any number. Change the numbers and the result updates instantly.
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How it works
To increase a number by a percentage, multiply it by (1 + percent / 100). To decrease it, multiply by (1 - percent / 100). This is how you add sales tax, apply a raise or take a discount.
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Example
Example: a 15% increase on 200 gives 230. A 15% decrease on 200 gives 170.
Tips
- Change one input at a time to see what moves the result most.
- Use realistic rates. Check current averages before you decide.
- Results are estimates and do not replace advice from a licensed professional.
Frequently asked questions
Is this calculator free?
Yes. There is no sign-up and nothing is stored on our servers; the math runs in your browser.
How accurate is it?
It uses standard formulas, but real offers include fees, rate changes and taxes that can differ. Treat the result as an estimate.
Sources and method
Page last updated November 2026. See our editorial policy and disclaimer.