Add or subtract fractions
Use a common denominator. For 1/2 + 1/3, rewrite the fractions as 3/6 and 2/6, then add to get 5/6. For subtraction, subtract the adjusted numerators instead. The calculator reduces the final answer.
Fraction Calculator
Calculate with two fractions and see the reduced answer. Use whole-number numerators and nonzero denominators.
Fraction Calculator
Free · No signupUNDERSTAND YOUR ANSWER
How to use this calculator
Multiply fractions
Multiply numerators together and denominators together. For 2/3 × 3/4, the product is 6/12, which reduces to 1/2. The fraction result is exact even when its decimal representation is not.
Divide by a fraction
Multiply by the reciprocal of the second fraction. For 1/2 ÷ 3/4, calculate 1/2 × 4/3 = 4/6 = 2/3. A zero second numerator would mean division by zero and is not allowed.
Enter mixed numbers and negative values
Convert 1 1/2 into 3/2 before entering it. You can put a negative sign on a numerator or denominator; the result is normalized to a positive denominator. Decimal answers such as 0.33333333 are rounded approximations of exact fractions such as 1/3.
A LITTLE MORE CLARITY
Common questions
Can I simplify just one fraction?
Yes. Multiply it by 1/1 to get its reduced form. For example, 12/18 × 1/1 gives 2/3.
Why are decimal inputs rejected?
The fraction fields represent integer numerators and denominators. Convert a decimal into a fraction first, such as 0.25 = 25/100.
About this tool
Created by Marchelle Cook at Roof & Ratio. These calculations run in your browser; entered values are not uploaded or saved by the calculator. Report a calculation issue with an example so we can review it.
Guide updated October 23, 2026. Displayed decimal results may be rounded; exact fraction and integer results are identified in the answer.