🔢 Percentage Calculator
Find X% of Y, or what percent X is of Y.
About this tool
A percentage calculator handles the three questions people actually get stuck on: finding a percent of a number, figuring out what percent one number is of another, and working out how much something has increased or decreased in percentage terms.
Percentages come up constantly alongside other everyday math — if you're working out a store markdown specifically, the Discount Calculator does that final-price math for you in one step.
Worked example
Say a jacket is $80 and it's 25% off. Using the first box, 25% of 80 is 20 — so you'd save $20 and pay $60. Or flip it: if you paid $60 for something that used to cost $80, the third box shows that's a 25% decrease.
How to use it
- Pick the box that matches your question — percent of a number, X as a percent of Y, or percentage change.
- Type in your two numbers.
- Press Calculate to see the result instantly.
Tips
- Percentage change is relative to the original number, not the new one — that's why a 50% drop needs a 100% increase to undo it.
- For discounts, use "X% of Y" then subtract from the original price, or just use our Discount Calculator directly.
- Negative percentage change means a decrease; positive means an increase.
FAQ
Is a percentage calculator accurate?
Yes — it's doing the same arithmetic you'd do by hand, just instantly and without typos.
What's the difference between percentage and percentage points?
Percentage change is relative (a 10% increase on 50 is 5). Percentage points is a straight subtraction between two percentages (60% minus 50% is 10 points).
Can I calculate a percentage decrease?
Yes, use the "percentage change" box — a negative result means a decrease.
📖 Want the fuller explanation?
See Percentages Explained for the reasoning behind this calculation, with worked examples.