To convert a fraction to a percentage, divide the top number by the bottom number and multiply by 100. 3/8 is 3 ÷ 8 = 0.375, and 0.375 × 100 = 37.5%. The same works for improper fractions: 5/4 is 125%.
Formula
percentage = numerator ÷ denominator × 100 Examples
- 7/20 = 0.35 = 35%.
- 2/3 = 0.6667 ≈ 66.67%.
Printable: Fraction to percent chart
Common mistakes
- Dividing the wrong way round: 8 ÷ 3 gives 266.67%, not 37.5%.
- Rounding too early. Round only the final percentage.
In Excel and Google Sheets
- Numerator in A2, denominator in B2 (format as %)
=A2/B2
FAQ
What is 1/3 as a percentage?
33.33% when rounded. Exactly, it is 33⅓%.
How do I convert a mixed number like 1 1/4?
Turn it into an improper fraction first, 5/4, then divide: 5 ÷ 4 × 100 = 125%.
Is there a chart of common fractions?
Yes: see the printable fraction to percent chart.
How we calculate: exact decimal math (no rounding errors), you choose the decimal places, and your numbers never leave your browser. Methodology →
Updated October 2026