Math & Scientific
Percentage Calculator
Percentage: it computes part = whole × percent ÷ 100 from the two required inputs: Percent and Value. Worked through below with real figures, and the calculator repeats the working on your own inputs — free, on-device, instant.
Use Percentage Calculator to solve a percentage question: give it your percent and value, press Calculate, and read off the answer — all worked out on your device.
About this calculator
Percentage is easiest to get wrong in the setup, not the arithmetic. It computes part = whole × percent ÷ 100 from the two required inputs: Percent and Value. It matters when you need the exact relationship checked quickly rather than worked through by hand. The worked example on this page (To find 15% of 240, enter 15 for Percent and 240 for Value. The calculation is 15 × 240 ÷ 100 = 36. Both inputs are required; inverse percentage questions need a separate calculation.) shows the full substitution; the calculator above runs the same working on your own numbers, in your browser, with nothing uploaded.
How to use
- Enter the percent and the value (e.g. 25 and 200).
- Press Calculate to run the percentage calculator.
- Read the result: the percentage of the value.
- Press Reset to clear the percentage calculator and start again.
Why use Percentage Calculator
Fast
Calculations run in your browser. No round trip to a server.
Private
Your inputs never leave your device. Nothing is uploaded.
Free
No signup, no paywall, no ads-in-results, no watermarks.
Accurate
Based on standard, well-established formulas.
Mobile-ready
Optimised for phones, tablets, and desktops alike.
Transparent
Honest disclaimers wherever browser limits or regional rules apply.
Common uses
Percentage in tutoring and teaching sessions
Use it for quick mental-math cross-checks
Use it for verifying answers from a textbook
Percentage in research and report calculations
Use it when comparing two different methods
Percentage in competitive-exam practice
Technical notes
Percentage Calculator computes part = whole × percent ÷ 100 from the two required inputs: Percent and Value. It does not solve for a missing percent or whole.
Inputs are taken exactly as entered, so check for typos before trusting an answer.
Because it runs locally, results appear instantly with no server round-trip.
Worked example
To find 15% of 240, enter 15 for Percent and 240 for Value. The calculation is 15 × 240 ÷ 100 = 36. Both inputs are required; inverse percentage questions need a separate calculation.
FAQ
What does the Percentage Calculator calculate?
It works out a percentage of a value — for example 25% of 200 = 50.
What do I enter in the Percentage Calculator?
The percent in the first box and the value in the second box.
How is it calculated?
percent × value ÷ 100, computed instantly in your browser.
Does the Percentage Calculator send my data to a server?
No — the Percentage Calculator runs entirely in your browser, so the numbers you enter never leave your device.