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What is 30% of 40?
30% of 40 = 12
40 × 30/100 = 12

How to calculate 30% of 40

Multiply 40 by 30 and divide by 100: 40 × 30 ÷ 100 = 12. Equivalent shortcut: 40 × 0.3 = 12.

As a discount

A 30% discount on a 40 purchase saves you 12, so you pay 28. Stacking more discounts? Use the Discount & Tax Calculator — stacked discounts multiply, they don't add.

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