What is 30% of 40?

Answer
30% of 40 = 12.00
30 ÷ 100 × 40 = 12.00
To find 30% of 40, convert the percentage to a decimal (0.30) and multiply by 40. That gives 12.00.

Try your own numbers

Need a different calculation? The full percentage calculator handles “% of a number”, percentage change, and “X is what percent of Y”.

CalcLumen · Percentage calculator