Percentage Calculator
X% of Y, % change, and "X is what % of Y?". Three modes, one calculator, instant copy.
Quick answer: X% of Y, % change, and "X is what % of Y?". Three modes, one calculator, instant copy.
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Frequently asked questions
- How do I calculate 20% of 150?
- Pick "X% of Y", enter 20 and 150, and the result is 30. The math: (20 / 100) × 150 = 30.
- How do I calculate a percentage increase or decrease?
- Pick "% change from X to Y". Enter the old value as X and the new value as Y. A positive result means growth; a negative result means decline. From 80 to 100 is +25%; from 100 to 80 is −20%.
- 30 is what percent of 200?
- Pick "X is what % of Y", enter 30 and 200, and the answer is 15%. The math: (30 / 200) × 100 = 15.
- How do I calculate a discount as a percentage?
- If a $200 item drops to $150, use "% change from X to Y" with 200 and 150 — the answer (−25%) is the discount. Or use our dedicated discount calculator for stacked discounts.
- How do I calculate a margin in percent?
- Margin % = (price − cost) / price × 100. Use "X is what % of Y" with X = (price − cost) and Y = price to get the gross margin percentage.
- What's the difference between percentage points and percent?
- Percentage points are an absolute change between two percentages (5% to 7% is +2 percentage points), while percent is a relative change (5% to 7% is a +40% increase). Mixing them up is one of the most common spreadsheet bugs.
- How do I calculate VAT as a percentage?
- VAT is just X% of Y where X is the rate. For more (add vs remove, multiple rates), use our dedicated VAT calculator.
- Can I round to 2 decimals?
- The tool already rounds the displayed result to a sensible number of digits while keeping the math at full precision. Copy the result to paste it into a spreadsheet at any precision you like.
- How do I calculate compound percentage growth?
- Compound growth multiplies (1 + r/100) repeatedly. For 5% per year over 10 years, use our compound interest calculator — it does the multiplication for you.
- Can I compare multiple scenarios?
- Yes — change the inputs and the result updates instantly, so you can flip between 10%, 15% and 20% without losing your place.