Fraction Calculator

Add, subtract, multiply, and divide fractions with automatic simplification.

Fraction Calculator helps you add, subtract, multiply, or divide fractions and simplify the result. Enter first numerator, first denominator, second numerator, and second denominator, review the breakdown, and use the guidance below to understand what the number means — and what it does not. What the Fraction calculator does Fraction Calculator is built for arithmetic, algebra, geometry, and number tools. Add, subtract, multiply, or divide fractions and simplify the result. You enter first numerator, first denominator, second numerator, and second denominator, then Simple Calculators computes the result instantly. Results use standard school and engineering formulas that run privately in your browser. How the math works Addition and subtraction use a common denominator. Multiplication multiplies tops and bottoms. Division flips the second fraction and multiplies. The answer is then simplified by dividing top and bottom by their largest common factor. The formula: a/b + c/d = (a × d + c × b) ÷ (b × d). Simplify by dividing the top and bottom by their largest common factor.