What is this tool?
A percentage calculator solves everyday ratio questions: discounts, tax, tips, grades, and growth rates. Enter two values and pick a mode to see the result instantly in your browser.
How to use
Choose “what is X% of Y” for sale prices, “X is what percent of Y” for share-of-total problems, or change modes for before/after comparisons.
Benefits
- Four common percentage modes in one panel.
- Works on mobile with large tap targets.
- Pair with Fraction and Ratio calculators for related math.
FAQ
How do I calculate a 20% discount?
Use “what is % of”, set X to 20 and Y to the original price—the result is the discount amount.
Does it handle negative changes?
Yes. Percentage change mode shows signed results when values go up or down.