What is 30% of 40?

30% of 40 = 12

Formula: 40 × 30 ÷ 100 = 12. Or work it out as 30 hundredths: 1% of 40 is 0.4, so 30% is 0.4 × 30 = 12.

• 40 − 30% = 28 (for example a 30% discount)
• 40 + 30% = 52 (for example adding 30% tax or a tip)
• 12 is 30% of 40

Any other numbers? Use the percentage calculator, the discount calculator or the percent change calculator.

Other percentages of 40

30% of other numbers

All percentage answers