Utility
Percentage Calculator
Work out X% of a number, what percent one number is of another, and percentage change.
What is X% of Y?
X is what percent of Y?
Percentage increase or decrease
About this tool
A percentage calculator answers the three questions people ask most often about percentages: what is X% of Y, X is what percent of Y, and the percentage increase or decrease between two numbers. Type your figures and the answer appears instantly - no formula to remember.
The three calculations
- X% of Y - find a part of a total, like 15% of a ₦20,000 bill. Formula: (X ÷ 100) × Y.
- X is what percent of Y - turn a part into a percentage, like a score of 42 out of 50. Formula: (X ÷ Y) × 100.
- Increase or decrease - measure change between two values, like a price moving from 8,000 to 10,000. Formula: ((new − old) ÷ old) × 100.
Everyday uses
- Working out discounts, tips, and service charges.
- Converting test scores and survey results into percentages.
- Tracking price changes, salary raises, or growth between two periods.
How to calculate a percentage by hand
To find a percentage of a number, divide the percentage by 100 and multiply by the number - so 20% of 250 is 0.20 × 250 = 50. To express one number as a percentage of another, divide and multiply by 100. This calculator does the arithmetic for you and rounds neatly, all in your browser with nothing sent to a server.
Calculating tax on a price? The VAT Calculator adds or removes VAT at any rate.
Frequently asked questions
How do I calculate X% of a number?
Divide the percentage by 100 and multiply by the number. For example, 15% of 2,000 is (15 ÷ 100) × 2,000 = 300. The first calculator does this automatically.
How do I find what percentage one number is of another?
Divide the part by the whole and multiply by 100. A score of 42 out of 50 is (42 ÷ 50) × 100 = 84%.
How is percentage increase or decrease calculated?
Subtract the old value from the new value, divide by the old value, and multiply by 100. Going from 8,000 to 10,000 is a 25% increase; the tool also tells you whether it is an increase or a decrease.
Does it handle decimals?
Yes. You can enter decimal values and the results are rounded to a few decimal places for readability.
Are my numbers sent anywhere?
No. All calculations run in your browser and nothing is uploaded.
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