Calculator
Percentage Calculator
Calculate percentages, increases, decreases, and more.
What is X% of Y?
How to Use
The Percentage Calculator offers four modes. 'X% of Y' finds a percentage of a number. 'X is ?% of Y' finds what percent one number is of another. '% Change' calculates percentage increase or decrease. 'Modify by %' shows the result of increasing or decreasing a number by a percentage. Select a mode, enter two values, and click Calculate. All processing runs in your browser.
Why Use This Tool
Percentages are used everywhere — discounts, taxes, grades, tips, investment returns. This tool gives instant, accurate results with the formula shown, so you never have to remember which formula to use.
Frequently Asked Questions
Percentage = (Part / Whole) × 100.
Use the '% Change' mode: enter original and new values. Formula: ((New - Old) / |Old|) × 100.
Yes! The tool handles negative numbers correctly.