Math & Science
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Percentage Calculator
Calculate percentages, percentage change, and percentage of a number instantly.
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Frequently Asked Questions
Multiply the number by the percentage divided by 100. Example: 20 percent of 150 = 150 times (20 divided by 100) = 30. Or simply move the decimal two places: 20% of 150 = 0.20 times 150 = 30.
Percentage change = ((New Value minus Old Value) divided by the absolute value of Old Value) times 100. A positive result is an increase and a negative result is a decrease. Example: price goes from 80 to 100: ((100 minus 80) divided by 80) times 100 = 25% increase.
Divide the result by the percentage expressed as a decimal. Example: if 30 is 25% of some number, the original = 30 divided by 0.25 = 120. Or: Original = Result times (100 divided by percentage).