What is 40% of 100?

40 percent of 100 is 40. Try other numbers in the calculator below.

Percentage

40% of 100

How to work out 40% of 100

Turn the percentage into a decimal: 40 ÷ 100 = 0.4.
Multiply by the number: 0.4 × 100 = 40.

Mental-math shortcut: Take 10% and multiply by four, or a fifth doubled. (1% of 100 is 1, so 40% is 1 × 40 = 40.)

40% of 100 is 40. Forty per cent appears in clearance discounts and in tax brackets. The quick route is 10% times four, or a fifth doubled.

Percentages of 100

1% of 1001

5% of 1005

10% of 10010

15% of 10015

20% of 10020

25% of 10025

30% of 10030

40% of 10040

50% of 10050

75% of 10075

100% of 100100

40% of other numbers

40% of 104

40% of 2510

40% of 5020

40% of 10040

40% of 20080

40% of 500200

40% of 1,000400

Method & sources

Pure arithmetic: X% of Y = Y × X ÷ 100. Results are calculated exactly and rounded only for display, so the reference tables and the calculator always agree.