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Percentage Calculator
Answer everyday percentage questions — discounts, grades, tips and growth — with the formula shown for every result.
Free, no sign-up. Runs in your browser: nothing is uploaded.
How to use Percentage Calculator
- Pick the question you want to answer.
- Type the numbers.
- Read the result and the formula.
Features
- X% of Y
- X is what % of Y
- Percentage change
- Percentage difference
- Formula shown
Private by design
Everything you type is calculated by your browser on this device. Nothing is sent to openWorkstand or anyone else, so the Percentage Calculator is safe for private and work data, and it keeps working offline once the page has loaded. How local processing works
When to use the Percentage Calculator
- Work out a discount or a tip.
- Calculate a test score as a percentage.
- Measure growth between two months.
Frequently asked questions
How do I calculate a percentage increase?
Subtract the old value from the new value, divide by the old value and multiply by 100. From 80 to 100 is (100 − 80) / 80 × 100 = 25%.
Is it really free?
Yes. There is no sign-up, no watermark, no daily limit and no paid plan. openWorkstand is paid for by a few ads on its public pages.
Keep working with the result
openWorkstand also includes a free workspace with documents, spreadsheets, tasks, projects and a calendar that save to a folder on your computer.