In short: A fraction calculator adds, subtracts, multiplies or divides fractions and mixed numbers, then simplifies the result to lowest terms and shows it as a mixed number and a decimal.
About Fraction Calculator
Fractions come up in recipes, woodworking, construction measurements and homework. To add or subtract them you need a common denominator; to multiply you multiply straight across; to divide you multiply by the reciprocal. Then the answer should be reduced to lowest terms by dividing by the greatest common divisor.
This calculator does all of that exactly — it works with whole-number numerators and denominators using arbitrary-precision integers, so there is no rounding — and shows each step. You can type proper fractions (3/4), improper fractions (7/4), mixed numbers (1 3/4), negative values and whole numbers.
How to use Fraction Calculator
- Type the first and second values, e.g.
2 1/4and5/6. - Choose the operation; the result appears immediately.
- Read the simplified fraction, mixed number, decimal and steps.
Examples
1 1/2 + 2/3 = 3/2 + 2/3 = 9/6 + 4/6 = 13/6 = 2 1/6 ≈ 2.1667.
0.375 = 375/1000 = 3/8.
Frequently asked questions
How do I simplify a fraction?
Divide the top and bottom by their greatest common divisor. 18/24: GCD is 6, so 18/24 = 3/4.
How do I divide fractions?
Multiply the first fraction by the reciprocal of the second: (1/2) ÷ (3/4) = (1/2) × (4/3) = 4/6 = 2/3.
Can I enter decimals?
Yes. Decimals are converted to exact fractions, e.g. 0.25 becomes 1/4.
What about repeating decimals like 0.333…?
Typed decimals are treated as exact, so 0.333 becomes 333/1000. Enter 1/3 directly for the exact value.
Updated November 2026 · Free, no signup · How we build and test tools