Fraction Calculator
Add, subtract, multiply or divide two fractions and get the result in lowest terms, as a mixed number and as a decimal.
Reviewed by the WorldCalcs team · Methodology · Last reviewed: June 2026
Result
5/6
Mixed number: 5/6
Decimal: 0.833333
What is a fraction?
A fraction represents part of a whole, written as a numerator over a denominator — for example, 3/4 means three parts out of four. The denominator is how many equal parts the whole is divided into, and the numerator is how many of those parts you have. A fraction calculator lets you combine two fractions using the four basic operations and shows the answer in its simplest form.
How fractions are calculated
To add or subtract, give both fractions a common denominator, combine the numerators, then simplify: a/b + c/d = (a·d + c·b) / (b·d). To multiply, multiply the numerators and the denominators: a/b × c/d = (a·c)/(b·d). To divide, multiply the first fraction by the reciprocal of the second: a/b ÷ c/d = (a·d)/(b·c). Every result is reduced to lowest terms by dividing the numerator and denominator by their greatest common divisor.
Example
1/2 + 1/3: the common denominator is 6, so 1/2 = 3/6 and 1/3 = 2/6. Adding gives 5/6, which is already in lowest terms and equals about 0.833. As another example, 7/8 + 2/8 = 9/8, which simplifies to the mixed number 1 1/8, or 1.125 as a decimal.
All calculations happen in your browser. Nothing is sent, stored, or tracked.
Results are estimates and may contain errors — for general information only, not professional advice. Always verify before relying on them. Disclaimer
How to use
Enter the numerator and denominator of each fraction, pick an operation, and read the result.
The answer is shown three ways: simplified fraction, mixed number, and decimal. Denominators of zero are flagged instead of producing a result.