What is 40% of 30?

40% of 30 = 12

Formula: 30 × 40 ÷ 100 = 12. Or work it out as 40 hundredths: 1% of 30 is 0.3, so 40% is 0.3 × 40 = 12.

• 30 − 40% = 18 (for example a 40% discount)
• 30 + 40% = 42 (for example adding 40% tax or a tip)
• 12 is 40% of 30

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

Other percentages of 30

40% of other numbers

All percentage answers