Math
Percentage Calculator
Free percentage calculator: find X% of a number, what percent one number is of another, and percentage change.
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Percentages show up everywhere: discounts, taxes, tips, grades, and interest. This tool bundles the most common percentage operations in one place.
Frequently asked questions
How do I calculate percentage increase?
Subtract the old value from the new value, divide by the old value, then multiply by 100. Example: from 200 to 250 = (50 ÷ 200) × 100 = a 25% increase.
How do I turn a percentage into a decimal?
Divide by 100. For example, 15% = 0.15. This is handy when multiplying by an amount to compute tax or a discount.
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