Percentage Calculator
Percent of, percentage change, and part–whole calculations. Use it for tips, discounts, or any “X% of Y” or “what percent is X of Y?” question. Results update as you type.
X% of Y
Result:
X is what percent of Y
Result:
Percent change
Result:
Informational only; verify critical results independently.
How to use
- Choose a mode: X% of Y, what percent X is of Y, or percent change between two values.
- Enter the numbers the mode asks for (e.g. percent and base, or part and whole).
- Results update as you type—no need to press a button for each change.
- Use “percent of” for tips, discounts, tax, or any “what is X% of Y?” question.
- Use “what percent” when you know part and whole and need the share (e.g. test score).
- Copy the result or round mentally; the tool shows enough precision for everyday use.
Examples
- What is 15% of 240? (e.g. tip or discount)
- What percent is 45 of 200? (e.g. share of a total)
- Percent change from 80 to 100 (growth or markup)
- 20% of a $65 bill for a tip estimate
- If you saved $12 on $80, what percent off is that?
- Increase 250 by 6% (e.g. price after small raise)
FAQ
- How do I find X% of Y?
- Multiply Y by X/100. Example: 15% of 240 = 240 × 0.15 = 36.
- Percentage points vs relative percent?
- Going from 10% to 12% is +2 percentage points. The relative increase is (12−10)/10 = 20%.
- Why is percent change undefined sometimes?
- If the old value is 0, relative change is undefined; enter a non-zero baseline.
- Does this round like my bank?
- We show precise math; banks and apps may round currency to cents differently.
- Can I use this for VAT or sales tax?
- Yes for the math: e.g. add 20% to a net price or find the pre-tax amount from a gross total.
- Is my data sent anywhere?
- No. Calculations run in your browser; we don’t store your inputs.
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Last updated: 2025-09-05