Percentage Calculator
Calculate percentages instantly. No sign‑up, no tracking – all calculations happen in your browser.
What is a percentage?
A percentage is a way of expressing a number as a fraction of 100. It is often denoted using the percent sign (%). For example, 45% means 45 out of 100. Percentages are used everywhere – from shopping discounts to financial interest rates and statistical data.
Common percentage formulas
- X% of Y: (X / 100) × Y – e.g., 20% of 200 is 40.
- X is what % of Y: (X / Y) × 100 – e.g., 50 is 20% of 250.
- Percentage change: ((New - Old) / Old) × 100 – e.g., 100 to 125 is a 25% increase.
Real‑life examples of percentage calculations
- Shopping discounts: A $50 shirt on sale at 20% off saves you $10 (20% of 50 = 10).
- Test scores: If you scored 85 out of 100 on a test, your percentage is 85%.
- Investment growth: A stock price rises from $100 to $125 – a 25% increase.
- Sales tax: If your purchase is $80 and sales tax is 7%, you pay $5.60 in tax (7% of 80 = 5.60).
Need to convert between fractions, decimals, and percentages? Try our Unit Converter or BMI Calculator for more health‑related calculations.
Why use Pencilfree Percentage Calculator?
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Your numbers never leave your device. No server, no storage.
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Instant results as you type – no waiting.
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Frequently Asked Questions
How do I calculate a percentage of a number?
Use the first tab: enter the percentage and the number, and the result appears instantly.
How do I find what percent X is of Y?
Use the second tab: enter X as the part and Y as the whole, and you'll get the percentage.
How do I calculate percentage increase or decrease?
Use the third tab: enter the original value and the new value. The tool shows the change as a percentage and indicates increase/decrease.
Do you store my calculations?
No. Everything happens in your browser. We never see or store any numbers you enter.