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Free Online Fraction Simplifier

Enter a numerator and denominator to reduce the fraction to lowest terms. Useful for homework checks and recipe scaling.

A fraction simplifier divides the top and bottom by their GCF to give the fraction in lowest terms.

Quick examples

How fraction simplification works

Simplifying means dividing the top and bottom by their greatest common factor (GCF) until no larger shared factor remains. Example: 6/12 divided by 6 gives 1/2.

You can enter any fraction—the tool returns the lowest-terms form even when the value is already reduced.

Worked examples

Real problems you might enter in the calculator above, with short walkthroughs.

  • Simplify 6/12

    GCF of 6 and 12 is 6. Divide both by 6 to get 1/2.

    Fraction6/12Lowest terms1/2

  • Reduce 10/15

    GCF is 5. Divide top and bottom by 5.

    Fraction10/15Lowest terms2/3

  • Already in lowest terms

    7 and 9 share no factor except 1, so the fraction cannot be reduced further.

    Fraction7/9Lowest terms7/9

  • Improper fraction 18/12

    GCF is 6. Simplified form is 3/2 (or 1 1/2 as a mixed number).

    Fraction18/12Lowest terms3/2

Frequently asked questions about the fraction Simplifier

  • How do you simplify a fraction?

    Divide the numerator and denominator by their greatest common factor until no larger common factor remains.

  • Is 10/20 already simplified?

    No. Divide top and bottom by 10 to get 1/2.

  • Can improper fractions be simplified?

    Yes. The same GCF rule applies. You may also convert to a mixed number separately if you prefer.

  • What if the GCF is 1?

    The fraction is already in lowest terms. The calculator will show the same values you entered.