Fraction to Percentage Calculator
Convert any fraction, such as marks out of a test or a recipe ratio, into a percentage instantly.
Your results
Calculation breakdown
- Percentage
- (Numerator ÷ Denominator) × 100
Worked example
A student scores 3 out of 4 on a quiz: 3 ÷ 4 × 100 = 75%.
Assumptions
- Works with negative numerators or denominators.
- Fractions greater than one produce percentages over 100%.
How this calculator works
This calculator converts a fraction into a percentage by dividing the numerator by the denominator and multiplying by 100. It's useful for school marks, survey results or any ratio expressed as parts of a whole.
Frequently asked questions
What if the denominator is zero?
Division by zero is not defined, so the calculator shows an error message if the denominator is zero.
Can the numerator be bigger than the denominator?
Yes, this produces a percentage over 100%, which is valid for fractions greater than one.
Does it handle negative fractions?
Yes, negative numerators or denominators are calculated correctly and will show a negative percentage where appropriate.
Editorial review and responsibility
Reviewed by the CalcAussie editorial team on 21 September 2026. Review scope: Method, Australian terminology, material assumptions, source links and user-facing limitations.
Calculator results remain estimates based on the figures entered. Check material decisions against current official information and report a suspected error so it can be reproduced and corrected.