About the Percentage Calculator
Percentage math shows up everywhere from calculating a discount to figuring out a raise, a grade, or how much a stock moved — yet the calculation needed differs depending on which two numbers you know and which one you're solving for.
This tool bundles the four most frequently needed percentage calculations into one place, so you don't have to remember which formula applies to which scenario.
Frequently Asked Questions
What's the difference between percentage change and percentage points?
Percentage change is a relative measure (e.g., going from 50 to 75 is a 50% increase), while percentage points measure an absolute difference (e.g., going from 50% to 75% is a 25 percentage point increase). These are commonly confused.
How do I calculate a percentage decrease?
Use the "% Change" tab — a negative result indicates a decrease. For example, going from 100 to 80 shows as -20%.
Can I use this for calculating a tip?
You can, though a dedicated tip calculator will also handle splitting the bill between multiple people, which this general-purpose tool doesn't do.