Fraction to Percentage Calculator

How it works

Divide the numerator by the denominator, then multiply by 100. So 3/8 = 0.375 × 100 = 37.5%. 1/4 = 25%. 7/20 = 35%.

Common fraction-to-percent conversions

• 1/2 = 50%
• 1/3 ≈ 33.3%
• 2/3 ≈ 66.7%
• 1/4 = 25%
• 3/4 = 75%
• 1/5 = 20%
• 1/8 = 12.5%
• 1/10 = 10%

Why this matters for pie charts

Survey results, sports stats, and recipe data are often expressed as fractions ("5 out of 8 respondents," "3 of 4 trials"). Pie charts need percentages. This calculator does the conversion in one step.

Frequently Asked Questions

How do I convert a fraction to a percentage?

Divide the numerator by the denominator, then multiply by 100. For 3/8, that's 3 ÷ 8 × 100 = 37.5%.

What about mixed numbers like 1 1/2?

Convert to an improper fraction first. 1 1/2 = 3/2 = 150%. The calculator handles decimal denominators if you prefer (3 / 2).

What if the denominator is zero?

Mathematically undefined — division by zero. The calculator returns no result if the denominator is 0.

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