Fraction Calculator
Work with fractions without hunting for common denominators. Enter two fractions, pick an operation, and the answer is simplified automatically.
Updated
Formula
a/b + c/d = (ad + bc) / bd
a/b × c/d = ac / bd
a/b ÷ c/d = ad / bc
The result is reduced by dividing the top and bottom by their greatest common factor. Improper fractions are also shown as mixed numbers.
Examples
3/4 + 2/5
3/4 + 2/5 = 23/20
5/6 − 1/4
5/6 − 1/4 = 7/12
2/3 ÷ 4/9
2/3 ÷ 4/9 = 3/2
Important information
- To enter a whole number, use 1 as the denominator (e.g. 3 = 3/1). For a mixed number like 2½, convert it first: 2 × 2 + 1 = 5, so 5/2.
Frequently asked questions
How do I add fractions with different denominators?
Multiply each fraction to a common denominator, add the numerators, then simplify. The calculator does all of this for you.
How do I divide fractions?
Flip the second fraction and multiply: a/b ÷ c/d = a/b × d/c.
How do I convert a fraction to a decimal?
Divide the numerator by the denominator. The result also shows the decimal and percentage.
Can I enter negative fractions?
Yes — put the minus sign on the numerator, e.g. −3/4.
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