Percentage Calculator
Work out any percentage in seconds: a percentage of a number, what percent one number is of another, and percentage increase or decrease.
- Free
- No sign-up
- Runs in your browser
Calculations happen entirely in your browser.
How to use Percentage Calculator
- Choose a calculation type.
- Enter the values.
- The result appears instantly.
About this tool
Percentages show up everywhere — tips, discounts, tax, grades, statistics. This calculator covers the three most common cases, so you never have to remember the formulas.
When to use it: discounts, marks, VAT, tips and any “what percent” question.
Frequently asked questions
How do I calculate percentage change?
Choose “Percentage change” and enter the old and new values. The result is (new − old) ÷ old × 100.
What does “percent” actually mean?
“Per hundred” — 25% is 25 out of every 100, which is the decimal 0.25. Every percentage calculation is a variation of that idea.
What is the difference between a percentage increase and percentage points?
Moving from 10% to 15% is a rise of 5 percentage points, but a 50% relative increase. The change mode computes the relative one.
How do I find the original value before a percentage was added?
Divide the final value by (1 + percent ÷ 100). For example, 110 after a 10% increase came from 110 ÷ 1.10 = 100.
Is 0.5 the same as 50%?
Yes — multiply a fraction or decimal by 100 to express it as a percentage.
Any quick mental tricks?
10% is the decimal point moved one place left; 5% is half of that; 20% is double. Together they cover tips, VAT and most sale maths.
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How to use Percentage Calculator
Enter the required values into the Percentage Calculator fields. The calculation updates as you adjust inputs. Use the result for planning, comparison, or documentation.
Practical benefits
- Complete tasks faster without installing additional software.
- Keep files private since processing happens in your browser.
- Produce consistent results that integrate into your workflow.
Frequently asked questions
Is this tool free to use?
Yes. Percentage Calculator is fully free with no account or subscription required.
Does it upload my files?
No. All processing occurs locally within your browser session.
Can I use this for professional projects?
Yes, the tool is designed for both casual and professional use. Always verify critical outputs.