Percentage Calculator
Three common percentage problems solved instantly — no formulas needed.
Quick answer: Free percentage calculator: what is X% of Y, X is what percent of Y, and percentage increase or decrease. Instant results, mobile friendly.
How to use
- Open this page on any device — no signup needed.
- Fill in the fields above.
- Get your result instantly — nothing is uploaded.
About this tool
A percentage calculator solves the three most common percentage problems: finding a percentage of a number, finding what percentage one number is of another, and calculating percentage increase or decrease between two values. Useful for discounts, taxes, grades, tips, finance and data analysis.
FAQ
How do I calculate X% of Y?
Multiply Y by X and divide by 100 — or just use the first mode of this calculator.
How do I calculate percentage change?
Subtract the old value from the new value, divide by the old value and multiply by 100. Mode 3 does it automatically.
Is it free?
Yes — 100% free, no signup, and all math runs in your browser.
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