Fraction Calculator
Add, subtract, multiply or divide two fractions. Automatic simplification with decimal and mixed-number outputs.
What is the Fraction Calculator?
The Fraction Calculator adds, subtracts, multiplies and divides two fractions and returns the simplified result, its decimal value and a mixed-number form where applicable. Simplification uses the greatest common divisor, so answers are always in lowest terms.
For addition and subtraction, the calculator builds a common denominator before combining the numerators. Multiplication works across numerators and denominators, while division multiplies by the reciprocal of the second fraction. Seeing the reduced, decimal and mixed forms together helps connect the different representations.
It handles negative fractions and warns clearly when a denominator is zero. Inputs remain exact fractions during the operation, avoiding the early rounding that can happen when fractions are first converted to decimals.
How to use the Fraction Calculator
- 1Enter the first fraction — numerator on top, denominator below.
- 2Pick an operator: +, −, × or ÷.
- 3Enter the second fraction.
- 4Read the simplified result, with decimal and mixed-number equivalents below.
When to use the Fraction Calculator
- Add recipe quantities such as 3/4 cup and 2/3 cup without converting by hand.
- Check fraction exercises and compare the simplified result with your working.
- Divide measurements in woodworking, sewing or other projects that use fractional units.
- Convert an improper fraction result into a mixed number for easier reading.
Key features
- All four basic operations
- Automatic simplification via GCD
- Decimal and mixed-number equivalents
- Handles negative fractions and zero numerators
Frequently asked questions
Does it handle mixed numbers as input?
Not directly — convert 1 1/2 to the improper fraction 3/2 first.
What happens if I enter 0 as denominator?
The result shows as "—" because dividing by zero is undefined.
Why does the answer have a different denominator?
Addition and subtraction require a common denominator, and the final fraction is then reduced by dividing both parts by their greatest common divisor.
Are decimal answers rounded?
The fraction is the exact result. Its decimal equivalent may be rounded for display when the value repeats or has more digits than the interface can show.
All Utility
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