What is 20% of 100?
20 percent of 100 is 20. Try other numbers in the calculator below.
20% of 100
20
How to work out 20% of 100
- Turn the percentage into a decimal: 20 ÷ 100 = 0.2.
- Multiply by the number: 0.2 × 100 = 20.
Mental-math shortcut: Divide by five, or take 10% twice. (1% of 100 is 1, so 20% is 1 × 20 = 20.)
20% of 100 is 20 — a figure you meet as a 20% tip, a 20% deposit, or a one-fifth share. Twenty per cent is easy to take mentally: divide by five, or take 10% twice.
Percentages of 100
20% of other numbers
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.
Page last updated: October 1, 2026
Frequently asked questions
What is 20% of 100?
20% of 100 is 20. To get it, divide 20 by 100 to make 0.2, then multiply by 100.
How do you calculate 20 percent of a number?
Convert the percentage to a decimal by dividing by 100 (20% becomes 0.2), then multiply by the number. Shortcut: divide by five, or take 10% twice.
20 is what percent of 100?
20 is 20% of 100 — dividing 20 by 100 and multiplying by 100 gives 20. This is the reverse of the calculation on this page.
Related percentage calculations
Related tools
These free tools pair well with this page — open them in a new tab to finish your workflow.