Fraction Calculator
Add, subtract, multiply, and divide fractions, with results simplified automatically.
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Enter fractions like “3/4” or whole numbers like “5”. Use a leading minus for negative values.
Result
5/6
Decimal: 0.833333
How it works
Enter two fractions and choose an operation. The math is done with whole-number cross-multiplication rather than rounded decimals, so results like 1/3 stay exact instead of becoming 0.333... along the way. The result is shown simplified, plus as a mixed number and a decimal where useful.
Example
3/4 ÷ 2/5 = 15/8 = 1 7/8 = 1.875
Frequently asked questions
- How are fractions simplified?
- The result is reduced using the greatest common divisor (GCD) of the numerator and denominator, so 6/8 becomes 3/4 automatically.
- Can I use negative fractions?
- Yes — enter a leading minus sign on either the numerator or the whole fraction, like "-3/4".
- What happens if I enter a fraction with a zero denominator?
- The calculator rejects it with a clear message, since dividing by zero is undefined.
- Can I enter a whole number instead of a fraction?
- Yes — a plain number like "5" is treated as 5/1.