Why use this calculator
Fraction arithmetic is essential in cooking, construction, engineering, and academic math. This calculator performs all four operations and automatically simplifies results.
How to use it
Enter the two fractions and select the operation. Results are shown as simplified fractions and decimal equivalents.
The formula
Addition: a/b + c/d = (ad + bc) / bd. Subtraction: a/b - c/d = (ad - bc) / bd. Multiplication: a/b × c/d = ac / bd. Division: a/b ÷ c/d = ad / bc.
Worked examples
3/4 + 1/2
5/4 or 1.25
2/3 × 3/5
2/5 or 0.4
When people use it
- Cooking recipe adjustments
- Construction measurements
- Academic math homework
- Engineering calculations
Tips
- Always simplify your final answer by dividing by the GCD
- To divide fractions, multiply by the reciprocal
- Mixed numbers should be converted to improper fractions first
Questions people ask
- How do I simplify a fraction?
- Find the greatest common divisor (GCD) of the numerator and denominator, then divide both by it. For example, 6/8: GCD of 6 and 8 is 2, so 6/8 = 3/4.