Fraction Calculator
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Combine two fractions and reduce the result to lowest terms automatically.
Two fractions
Result
5/6
1/2 + 1/3 ≈ 0.8333
- Decimal value
- 0.8333
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Fraction arithmetic
To add or subtract fractions, first find a common denominator by multiplying the two denominators together, then combine the numerators. To multiply fractions, multiply straight across (numerator × numerator, denominator × denominator). To divide, multiply the first fraction by the reciprocal of the second.
Every result is automatically reduced to lowest terms by dividing both the numerator and denominator by their greatest common factor (GCF). A negative sign is always kept in the numerator so the denominator stays positive.
Example: 1/2 + 1/3 uses the common denominator 6 — that's 3/6 + 2/6 = 5/6, which is already in lowest terms. Multiplying the same two fractions instead gives 1/2 × 1/3 = 1/6.
Common questions
Why is my answer already reduced?
This calculator divides the numerator and denominator by their greatest common factor after every operation, so you always see the simplest equivalent fraction.
Can I use negative numbers?
Yes. Enter a negative numerator (e.g. -1) for a negative fraction. The calculator keeps the sign in the numerator and the denominator positive.
What happens if I enter 0 as a denominator?
Division by zero is undefined, so the calculator cannot return a result — enter a non-zero denominator for both fractions.