Percentage Calculator
5 modes for everyday percentage math
Quick guide
What can Percentage Calculator help you do?
Free percentage calculator with 5 modes: of, ratio, change, increase, decrease.
Best for
Percentage Calculator is for everyday estimates, unit conversion, percentages, splitting costs, or getting a quick number before opening a spreadsheet.
How to use it
For Percentage Calculator, enter the numbers and conditions shown on the page. If there are units or modes, confirm those first before comparing the result.
How to read the result
After using Percentage Calculator, check the result together with the inputs, units, and rounding. A quick calculator result should not be treated as a formal quote or final decision.
Privacy and limits
When using Percentage Calculator, calculations run in the browser and do not require an upload. For private income, prices, or health numbers, use approximate values when that is enough.
For Percentage Calculator: The calculator provides a practical estimate. For taxes, loans, medical decisions, or contracts, rely on official documents or professional advice.
Frequently Asked Questions
Why doesn't +10% then -10% return to original?
Because the 10% decrease is applied to the larger value. 100 → 110 → 99.