What Is a Percentage?
A percentage is a number expressed as a fraction of 100, written with the % symbol. 25% means 25 out of 100, or 0.25. To find a percentage of a number, multiply the number by the percentage and divide by 100: 20% of 150 = 150 × 20 ÷ 100 = 30.
Common Calculations
What percent A is of B: A ÷ B × 100. Percentage of a total: total × percent ÷ 100. Percentage change: (new − old) ÷ old × 100.
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🔗 Related Terms
More Math & Statistics Terms
- Absolute Value
- Confidence Interval
- Correlation
- Exponent
- Exponential Growth
- Grade Point Average (GPA)
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Last updated: September 27, 2026. This definition is for general educational purposes only. It is not financial, investment, tax, legal, or medical advice, and it does not recommend any product or course of action. For decisions about your own situation, consult a qualified professional.