Fraction Calculator

Add, subtract, multiply, divide and simplify fractions exactly. Converts decimals to fractions and shows mixed numbers.

How to use the Fraction Calculator

Enter or select: Expression.
The results (Simplified fraction, Mixed number, Decimal) are calculated instantly as you type.
Use “Copy link” to share the calculation with the same input values.

Formula

a/b + c/d = (ad + bc)/bd
Simplify by dividing by gcd(numerator, denominator)

About this tool

All arithmetic is done with exact big-integer rationals, so results never suffer from rounding.