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What is X% of Y?
A percentage calculator is a mathematical tool that helps you perform various percentage-related calculations quickly and accurately. Percentages are used everywhere in daily life — from calculating tips at restaurants and discounts while shopping to understanding statistics, financial reports, and academic grades. Our free online percentage calculator eliminates manual calculations, reducing errors and saving time.
The word "percentage" comes from Latin "per centum," meaning "by the hundred." When we express a number as a percentage, we describe it as a fraction of 100. For example, 25% means 25 out of 100, or one-quarter of a whole.
To find what percentage of a number equals, multiply the number by the percentage and divide by 100:
Example: What is 25% of 200?
Result = (25 × 200) ÷ 100 = 5,000 ÷ 100 = 50
Example: 45 is what percent of 180?
Percentage = (45 ÷ 180) × 100 = 0.25 × 100 = 25%
Example: Price increased from $80 to $100. What's the increase?
Change = ((100 - 80) ÷ 80) × 100 = 25 ÷ 80 × 100 = 25% increase
For quick mental math, break percentages into easier parts. To find 15%, calculate 10% (move decimal left) and add half of that (5%). For example, 15% of 80: 10% = 8, 5% = 4, so 15% = 12.
Yes! Percentages over 100% represent values greater than the original. If sales increased from 100 to 250, that's a 150% increase.
Divide the numerator by denominator, then multiply by 100. For example, 3/4 = 0.75 × 100 = 75%.
Percentage represents a portion of 100. Percentile shows ranking in a distribution — if you're in the 80th percentile, you scored higher than 80% of people.