🧮 Maths

Percentage Calculator

Three calculators in one: what is X% of Y, percentage change between two values, or what percentage X is of Y.

Percentage (%) of Value

Result
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Remainder

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Quick tip: To find X% of Y, multiply Y by (X/100). For percentage increase from A to B: (B-A)/A × 100. A positive result = increase, negative = decrease.

Common Percentage Examples

Question	Answer
What is 20% of 150?	30
25 is what % of 200?	12.5%
Price up from 80 to 100?	+25%
Remove 20% VAT from £120?	£100 net

FAQs

Multiply the number by the percentage and divide by 100. Example: 15% of 80 = (80 x 15) / 100 = 12. Shortcut: 80 x 0.15 = 12.

(New - Old) / Old x 100. Example: from 50 to 60 = (60-50)/50 x 100 = +20%. A price drop from 60 to 50 = (50-60)/60 x 100 = -16.67%.

Original = Final / (1 + percentage/100). Example: £120 price includes 20% tax. Original = 120 / 1.20 = £100.

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