Reduces a single fraction to its simplest possible form by dividing both the numerator and denominator by their greatest common divisor.
How it works
The greatest common divisor of the numerator and denominator is found using the Euclidean algorithm, then both numbers are divided by it.
What this does not include
This does not include arithmetic between two fractions — for adding, subtracting, multiplying, or dividing two fractions, use this site’s fraction calculator instead.
How to use this calculator
- Enter the numerator and denominator of a single fraction.
Frequently asked questions
What does “lowest terms” mean?
A fraction is in lowest terms when its numerator and denominator share no common factor other than 1 — it can’t be simplified any further.
How is the greatest common divisor found?
Using the Euclidean algorithm, a standard, efficient method for finding the largest number that divides two integers evenly.
What if the fraction is already in lowest terms?
The calculator returns the same fraction unchanged — dividing by a greatest common divisor of 1 has no effect.
