Find what X% of a number is โ instantly, with the working shown.
20% of 250
50
A percentage is just a fraction out of 100 โ "20%" means "20 out of every 100." This calculator answers the single most common percentage question there is: what is X% of Y? Type in any percentage and any number, and it works out the answer immediately, showing the exact steps so you can see how it got there rather than just trusting a black box.
This comes up constantly in everyday life โ working out a discount at a shop, checking how much tax is added to a bill, splitting a tip, or figuring out what a exam score out of a smaller total actually means. The maths behind it is simple once you see it laid out, and this page shows that working every time.
Formula
Result = (Percentage รท 100) ร Number
Divide the percentage by 100 to turn it into a decimal, then multiply by the number.
Worked Example
Worked example
Where this is used
Discounts and sales ("30% off โน1,200"), tax and service charges added to a bill, tips at a restaurant, exam and quiz scoring, interest calculations, and any situation where you need a slice of a whole number expressed as a percentage.
A common mistake to avoid
People sometimes multiply by the percentage number directly instead of dividing by 100 first โ for example doing 250 ร 20 instead of 250 ร 0.2. Always convert the percentage to a decimal (divide by 100) before multiplying.
Frequently Asked Questions
How do I calculate a percentage of a number by hand?
Divide the percentage by 100 to get a decimal, then multiply that decimal by the number. For 15% of 80: 15 รท 100 = 0.15, then 0.15 ร 80 = 12.
What is 50% of a number?
50% of any number is simply half of it โ divide the number by 2. 50% of 90 is 45.
Can the percentage be more than 100%?
Yes. 150% of 200 is 300 โ anything over 100% means "more than the whole number," which is normal in cases like growth or markup.
Is this the same as a percentage increase calculator?
No โ this tool finds a percentage of a number (e.g. 20% of 250 = 50). If you want to know how much a number grew by, use the Percentage Increase Calculator instead.
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