About the fraction calculator
Fractions turn up in recipes, woodworking, and homework. Enter two fractions and an operation; the calculator finds a common denominator, simplifies the result using the greatest common divisor, and shows the mixed-number and decimal forms.
How to use this calculator
- Enter the first numerator and denominator.
- Choose an operation.
- Enter the second fraction.
- Read the simplified answer.
Worked examples
- 1/2 + 1/3 = (1×3 + 1×2) / 6
- = 5/6 ≈ 0.8333
5/6.
Measurement guidance
Tape measures
Inch fractions such as 3/8 or 5/16 can be added here, then converted to decimals for other calculators.
Frequently asked questions
What is a mixed number?
A whole number plus a fraction, such as 1 3/4 for 7/4.
Can I enter whole numbers?
Yes — use a denominator of 1.
Why can’t the denominator be zero?
Division by zero is undefined.