Fraction Calculator

Type fractions like 3/4, whole numbers like 5, or mixed numbers like 1 2/3. The result is always shown in simplest form.

First fraction

e.g. 1/2, 5, or 1 2/3

Second fraction

e.g. 3/4 or 2

1/2 + 1/4

3/4

= 0.75 as a decimal

Mixed number

3/4

Decimal

0.75

Formula: a/b + c/d = (ad + cb) / bd · a/b × c/d = ac / bd · a/b ÷ c/d = ad / bc — then divide by the greatest common divisor.

Frequently asked questions

How do I add fractions?: Give both fractions the same denominator, add the numerators, then simplify. 1/2 + 1/4 = 2/4 + 1/4 = 3/4.
How do I divide fractions?: Multiply by the reciprocal of the second fraction: 3/4 ÷ 2/3 = 3/4 × 3/2 = 9/8.
Can I enter mixed numbers?: Yes — write them with a space, for example 1 2/3.