Fractions Calculator

Answer: 5/6
As a mixed number: 5/6
As a decimal: 0.8333
Working: 1/2 + 1/3 = 3/6 + 2/6 = 5/6

What it does

Enter two fractions (or mixed numbers, whole numbers or decimals) and choose add, subtract, multiply or divide. You get the answer in its simplest form, as a mixed number and as a decimal, with the working shown.

How to use it

First fraction: A fraction like 3/4, a mixed number like 1 1/2 (with a space), a whole number, or a decimal.
Do: What to do with the two fractions.
Second fraction: The second fraction, in the same way.

Common uses

Checking fractions homework.
Scaling recipe quantities or measurements in inches.
Working out percentages. Try the Percentage Calculator
Working with ratios.

The formula

a/b + c/d = (ad + bc) ÷ bda/b × c/d = ac ÷ bda/b ÷ c/d = a/b × d/c

Where:

Simplest form: top and bottom divided by their largest common factor

Mixed numbers are turned into top-heavy fractions first: 1 1/2 = 3/2.

Worked example

To add 1/2 and 1/3, put them over the same denominator:

1/2 + 1/3 = 3/6 + 2/6 = 5/6
As a decimal: 0.8333

Questions people ask

How do I add fractions with different denominators?

Turn them into fractions with the same bottom number first. For 1/2 + 1/3, both become sixths: 3/6 + 2/6 = 5/6.

How do I divide fractions?

Flip the second fraction upside down and multiply. 3/4 ÷ 1/2 = 3/4 × 2/1 = 6/4, which simplifies to 3/2 or 1 1/2.

How do I type a mixed number?

Put a space between the whole number and the fraction, like 2 3/4. For a negative mixed number, put the minus sign first: -2 3/4.

Last checked 25 October 2026