Fraction Calculator

Add, subtract, multiply, or divide two fractions and get a simplified result.

How this calculator works

Fractions are combined using standard rules, then automatically simplified using the greatest common divisor so the result is always in lowest terms.

a/b + c/d = (ad + bc) / bd, then simplified
Multiplication and division follow the standard cross-multiplication rules.

Frequently asked questions

Is the result automatically simplified?

Yes — the result is always reduced to its simplest form using the greatest common divisor.

Can I use negative numbers?

Yes, enter a negative sign in either the numerator or denominator field.