Fraction Calculator
Add, subtract, multiply and divide fractions, with the result simplified to lowest terms.
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Step by step
The formula
combine over a common denominator, then divide by the GCD
Adding fractions needs a common denominator; multiplying and dividing work directly on numerators and denominators. Whatever the operation, the final move is the same — divide both parts by their greatest common divisor to reach lowest terms.
All calculations run locally in your browser and update instantly as you type.
Example calculations
Common questions this calculator answers — select one to load its values.
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Frequently asked questions
Are results simplified?+
Yes — the result is reduced to lowest terms by dividing the numerator and denominator by their greatest common divisor.
All calculations run locally in your browser. Nothing you type is sent to a server.