Percentage Calculator
Calculate percentages, find what percent one number is of another, or calculate percentage increases and decreases.
Result
10
1
Operation
2
Number
3
Percent (%)
What is X% of Y?
10
Formula
10% of 100 = 100 × 10 ÷ 100 = 10
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What is a Percentage?
A percentage is a number expressed as a fraction of 100. The word "percent" comes from the Latin "per centum," meaning "by the hundred."
To convert a percentage to a decimal, divide by 100. For example, 25% = 0.25
Common Percentage Calculations
| Calculation | Formula | Example |
|---|---|---|
| X% of Y | Y × X ÷ 100 | 20% of 150 = 30 |
| X is what % of Y | X ÷ Y × 100 | 30 is 20% of 150 |
| Increase by X% | Y × (1 + X/100) | 100 + 20% = 120 |
| Decrease by X% | Y × (1 - X/100) | 100 - 20% = 80 |
Quick Tips
- 10% of any number: Move the decimal point one place left
- 50% of any number: Divide by 2
- 25% of any number: Divide by 4
- 1% of any number: Move the decimal point two places left
Real-World Applications
- Sales tax calculation
- Tip calculation at restaurants
- Discount prices during sales
- Interest rates on loans
- Grade calculations in school