Percentage Calculator
%
A percentage represents a ratio as parts per hundred. The % symbol evolved from "per cento" (Italian for "per hundred"). Percentages appear in discounts, tax rates, test scores, nutrition labels, and statistics.
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Tip: 10% mental math: just move the decimal left one place. 10% of $47.50 = $4.75. Then scale up.
15% of 200=30(15/100)×200=30
45 is ?% of 180=25%(45/180)×100=25%
50 → 65, % change=+30%((65-50)/50)×100=30%
| Percent | Decimal | Fraction |
|---|---|---|
| 1% | 0.01 | 1/100 |
| 5% | 0.05 | 1/20 |
| 10% | 0.1 | 1/10 |
| 20% | 0.2 | 1/5 |
| 25% | 0.25 | 1/4 |
| 50% | 0.5 | 1/2 |
| 75% | 0.75 | 3/4 |
| 100% | 1.0 | 1/1 |
| 150% | 1.5 | 3/2 |
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Fun Fact
The % sign evolved over centuries from "per 100" written in manuscripts as "p100" or "p/100", gradually morphing into the modern symbol.
References
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