Free Online Percentage Calculator
Quickly find percentages, calculate percentage increase/decrease, and solve proportion problems. Perfect for calculating discounts, markups, grades, tax rates, and more.
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Mastering Percentage Calculations
What Is a Percentage?
A percentage is a fraction expressed as parts per hundred. The word comes from the Latin "per centum," meaning "by the hundred." When you see 25%, it means 25 out of 100, or one quarter. Percentages are everywhere in daily life: sales tax, tip calculations, grade scores, battery levels, interest rates, and nutritional labels all use percentages to communicate proportions in an intuitive way.
Percentage Change vs. Percentage Points
These two concepts are often confused. If a rate goes from 5% to 8%, that's a 3 percentage point increase but a 60% percentage change (because 3/5 = 0.60). News articles about inflation, interest rates, or poll results often mix these up. Percentage change measures relative growth, while percentage points measure absolute difference. Our calculator handles both scenarios clearly.
Practical Examples
Need to figure out a 20% tip on a $47.50 dinner? That's $47.50 × 0.20 = $9.50. Wondering what percentage 35 is of 200? That's (35 ÷ 200) × 100 = 17.5%. Want to know the sale price after a 30% discount on a $89 item? That's $89 × 0.70 = $62.30. These real-world calculations come up constantly, and having a dedicated tool makes them effortless.