💯 Percentage Calculator
Quick answer
A percentage is a fraction of 100. To find X% of Y, multiply Y by X and divide by 100. To express X as a percentage of Y, divide X by Y and multiply by 100. Percentage change is the difference between two values divided by the original value, multiplied by 100.
What is X% of Y?
X is what percent of Y?
Percentage increase / decrease
Change: 25 (increase ↑)
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How to use the Percentage Calculator
- Choose the panel that matches your question — there are three.
- Enter the two numbers in that panel.
- Click "Calculate" to see the result instantly.
- For change, the tool also tells you whether the value increased or decreased.
Frequently asked questions
How do I calculate a percentage of a number?
Multiply the number by the percentage and divide by 100. Example: 20% of 250 = 250 × 20 ÷ 100 = 50.
How do I find the percentage increase?
Subtract the old value from the new value, divide by the old value, and multiply by 100. Going from 80 to 100 is a 20 ÷ 80 = 25% increase.
What is the difference between percent and percentage points?
Percent is a relative change; percentage points are the direct difference between two percentages. A rise from 10% to 15% is a 5 percentage-point rise, but a 50% relative increase.