CalculatorFraction Calculator
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How to use
Type the top number (numerator) and bottom number (denominator) of each fraction and choose +, −, × or ÷. The answer is reduced automatically and also shown as a mixed number and a decimal. For a whole number, use 1 as the bottom number: 3 = 3/1.
How each operation works
| Operation | Rule | Example |
|---|---|---|
| Add | Use a common denominator | 1/2 + 1/3 = 3/6 + 2/6 = 5/6 |
| Subtract | Use a common denominator | 3/4 − 1/4 = 2/4 = 1/2 |
| Multiply | Top × top, bottom × bottom | 2/3 × 3/4 = 6/12 = 1/2 |
| Divide | Flip the second fraction and multiply | 1/2 ÷ 1/4 = 1/2 × 4/1 = 2 |
Reducing a fraction
Divide the top and bottom by their greatest common factor (GCF). For 18/24, the greatest common factor is 6, so it becomes 3/4.
Mixed numbers
An improper fraction like 7/3 can be written as a mixed number: 7 ÷ 3 = 2 with a remainder of 1, so 7/3 = 2 1/3 (two and one third).
FAQ
Can I use negative fractions?
Yes. Put the minus sign on the top number, like −1/2.
Why can't the bottom number be 0?
Dividing by zero has no answer, so a fraction cannot have 0 as its denominator.
Related guide
- Fractions: Add, Subtract, Multiply and DivideStep-by-step methods for adding, subtracting, multiplying and dividing fractions, plus simplifying, mixed numbers and converting to decimals.
- Fractions, Decimals and Percents: Converting Between ThemConvert fractions to decimals and percents, see which fractions terminate and which repeat, and turn repeating decimals like 0.1666... back into fractions.