How do I type a mixed number?

Use a space — “1 1/2” means one and a half.

Is the result always simplified?

Yes, using the greatest common divisor.

Fraction Calculator

Add, subtract, multiply and divide fractions with automatic simplification, plus decimal and percentage equivalents, mixed-number form and step-by-step working.

Example values are shown — change any of them and the answer updates live.

Expression

How it works

Step 1 · Common denominator

LCM(4, 6) = 12

4·6 ÷ gcd = 12

Step 2 · Equivalent fractions

3/4 = 9/12

1/6 = 2/12

9/12 + 2/12

Step 3 · Simplify

÷ gcd(11, 12) = 1

11/12 ÷ 1 = 11/12

11/12

Exact arithmetic — computed instantly in your browser.