Fraction simplifier
Enter the numerator and denominator to get the reduced fraction and the greatest common divisor used to reduce it.
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Processing and privacy: The result is calculated inside your browser and your data is not sent to any server.
How to use it
- Enter numerator and denominator.
- The result appears straight away and updates as you edit.
- Copy the result, or copy a link that keeps the same values to share it.
How it is calculated
Simplified = (numerator ÷ GCD) / (denominator ÷ GCD), where GCD is the greatest common divisor
Example
Inputs: Numerator = 18, Denominator = 24. Result: Fraction in lowest terms: 3/4; Greatest common divisor: 6; Decimal: 0.75.
Limits and caveats
- Only whole numbers are accepted. For decimals, use the decimal to fraction converter.
Questions about this tool
How do I simplify 18/24?
The greatest common divisor is 6. Divide both by 6 to get 3/4.
When is a fraction in lowest terms?
When the greatest common divisor of the numerator and denominator is 1, as in 7/13.
How is the greatest common divisor found?
With Euclid’s algorithm: divide the larger number by the smaller and repeat with the remainder until it reaches zero.