Work out percentages of a number, ratios and percentage change.
Quickly find X% of a number — useful for discounts, tips, tax, marks and more. Enter the percentage and the number to get the answer instantly.
A percentage is simply a fraction out of 100. Three questions cover almost every everyday percentage problem:
Result = (X ÷ 100) × Y
Example: 15% of 200 = 0.15 × 200 = 30.
Percent = (X ÷ Y) × 100
Example: 30 is what percent of 200? (30 ÷ 200) × 100 = 15%.
Change% = ((New − Old) ÷ Old) × 100
Example: a price rising from 50 to 75 is a ((75 − 50) ÷ 50) × 100 = 50% increase. A drop from 75 to 50 is a 33.3% decrease.
Multiply the number by the percentage and divide by 100. For example, 20% of 150 = 150 × 20 ÷ 100 = 30.
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