Free Percentage Calculator
Three modes: X% of Y, X is what % of Y, and percentage change. Free, instant.
What is X% of Y?
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How to Calculate Percentages
Choose your mode: "X% of Y" multiplies Y by X/100, "X is ?% of Y" divides X by Y and multiplies by 100, and "% Change" calculates (new-old)/old × 100. All calculations are instant and run in your browser.
Why Use Our Percentage Calculator?
Percentages come up constantly — discounts, tips, tax, grade calculations, financial returns, and more. Our three-mode calculator handles all common percentage scenarios without you needing to remember which formula to use.
Frequently Asked Questions
How do I calculate a tip? Use "X% of Y" mode. Enter the tip percentage (e.g., 18) and the bill amount.
How do I find percentage change? Use "% Change" mode. Enter the new value and old value to see the percentage increase or decrease.