What is 30% of 100?

30 percent of 100 is 30. Try other numbers in the calculator below.

Percentage

30% of 100

How to work out 30% of 100

Turn the percentage into a decimal: 30 ÷ 100 = 0.3.
Multiply by the number: 0.3 × 100 = 30.

Mental-math shortcut: Take 10% and multiply by three. (1% of 100 is 1, so 30% is 1 × 30 = 30.)

30% of 100 is 30. Thirty per cent is a common sale discount and a rough rule-of-thumb ceiling for housing costs as a share of income. Take 10% and multiply by three.

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

30% of other numbers

30% of 103

30% of 257.5

30% of 5015

30% of 10030

30% of 20060

30% of 500150

30% of 1,000300

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.