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Percentage Calculator
Calculate percentages instantly — discounts, changes, and more.
📖 How to use this calculator
Three modes: find what percentage one number is of another, calculate a percentage of a value, or work out the percentage change between two numbers. Useful for discounts, tax, interest, exam scores, and more.
Quick tip: "X% of Y" = (X ÷ 100) × Y · "X is what % of Y" = (X ÷ Y) × 100 · "% change from X to Y" = ((Y − X) ÷ X) × 100
20% of 150
30.00
Common examples
20% off £80
£64
VAT on £100
£120
10% tip on £45
£4.50
5% pay rise on £30k
£31,500
Sources & References