Fraction Calculator
Add, subtract, multiply and divide two fractions, with the result automatically simplified to lowest terms.
Enter numerators and denominators of two fractions
How to use the fraction calculator
Enter the numerators and denominators of two fractions and choose an operation: addition, subtraction, multiplication or division. The calculator returns the result as a fraction right away.
The answer is automatically reduced to lowest terms by dividing the numerator and denominator by their greatest common divisor. If the result is an improper fraction, it can be rewritten as a mixed number.
Every calculation runs locally in your browser and updates instantly — your numbers never leave your device, so the tool stays fully private and works even offline.
Why use this calculator
Four operations
Supports addition, subtraction, multiplication and division of fractions.
Auto-simplify
The result is reduced to lowest terms automatically, no extra steps.
Instant answer
The fraction recalculates automatically whenever you change a number.
Frequently asked questions
Which fraction operations are supported?
The calculator performs the four arithmetic operations on two fractions: addition (+), subtraction (−), multiplication (×) and division (÷).
How do you add fractions with different denominators?
The fractions are converted to a common denominator, the numerators are added, and the result is simplified. The calculator does this automatically.
Is the result simplified?
Yes. The answer is always reduced to lowest terms by dividing the numerator and denominator by their greatest common divisor.
How do you divide one fraction by another?
Dividing by a fraction means multiplying by its reciprocal: a/b ÷ c/d = a/b × d/c. The result is then simplified.
Can I enter negative fractions?
Yes, you can put a negative number in the numerator. The sign is included in the calculation and shown in the final fraction.