Fraction Calculator: Add, Subtract, Multiply, Divide
Do the four operations on two fractions with simplified answers.
How to use it
- Enter the numerator (top) and denominator (bottom) of each fraction.
- Choose +, −, × or ÷ between them.
- The answer updates instantly, simplified, with a mixed number and decimal when they apply.
How it works
To add or subtract, fractions need a common denominator: 1/2 + 1/3 = 3/6 + 2/6 = 5/6. To multiply, multiply tops and bottoms: 2/3 × 3/5 = 6/15 = 2/5. To divide, flip the second fraction and multiply: 1/2 ÷ 1/4 = 1/2 × 4/1 = 2.
The calculator simplifies by dividing the top and bottom by their greatest common divisor.
Questions
Can I enter negative fractions?
Yes, put the minus sign on the numerator, for example -1 over 2.
What if the denominator is zero?
A fraction cannot have a zero denominator, so the tool shows a message instead of an answer.