Fraction calculator

Add, subtract, multiply, or divide two fractions and simplify.

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Tool guide

Fraction calculator: how it works

Practical information to understand the result and use this tool correctly.

About Fraction calculator

Fraction arithmetic uses common denominators for addition/subtraction and cross-multiplication rules for products and quotients.

Results are reduced with the greatest common divisor so 2/4 becomes 1/2 automatically.

Useful for homework checks, recipe scaling, and quick ratios without a full CAS.

How to use it

1Enter numerators and denominators for both fractions.
2Choose the operation code (add, subtract, multiply, divide).
3Read the simplified fraction and decimal form.

Frequently asked questions

Zero denominators?: They are rejected. A fraction must have a non-zero denominator.
Mixed numbers?: Convert mixed numbers to improper fractions first (e.g. 1 1/2 → 3/2).