Percentage Calculator
X% of Y, X as a percent of Y, and change.
What is% of?
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is what % of?
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Change fromto
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How to use it
- Pick the calculator you need: “What is X% of Y?”, “X is what % of Y?” or “Change from X to Y”.
- Enter your numbers. Decimals, negative numbers and thousands separators like 1,234.5 are fine.
- The answer appears as you type, rounded to at most 4 decimal places. Press Copy next to it to copy the result.
Frequently asked questions
How do I calculate a percentage of a number?
Multiply the number by the percentage and divide by 100. For example, 20% of 250 is 250 × 20 ÷ 100 = 50.
How do I work out a discount?
Find the discount amount first, then subtract it from the price. A 25% discount on $80 is 80 × 25 ÷ 100 = $20 off, so you pay $60.
How do I calculate percentage increase or decrease?
Subtract the old value from the new one, divide by the old value and multiply by 100. Going from 40 to 50 is (50 − 40) ÷ 40 × 100 = a 25% increase. A negative result means a decrease.
Why doesn't a 10% rise followed by a 10% drop get me back to the start?
Because the second percentage is taken from the new, higher value. 100 becomes 110, and 10% of 110 is 11, so you end up at 99.