Percentage Calculator
Use one flexible calculator to find percent change, calculate what percentage one value is of another, or measure a discount from original to sale price.
- Zero dependencies
- Accessible form structure
- Mobile responsive layout
- Validation and edge-case handling
Calculator
Results
Ready to calculate
Enter your figures and press Calculate. Results update instantly in your browser.
Frequently asked questions
What is a percentage?
A percentage expresses a part relative to a whole, out of 100.
What is percent change?
Percent change compares a starting value and an ending value to show how much something increased or decreased in relative terms.
What are percentage points?
Percentage points measure the simple arithmetic difference between percentages, which is different from percent change.
How do discounts work?
A discount percentage compares the reduction to the original price, not the sale price.
What about compound percentage?
Compounding applies repeated percentage changes over time, which can produce a different result than one simple percentage change.
Why verify percentage math?
Percentages can be misleading when the starting value is very small or when people confuse points, ratios, and changes.