Add, subtract, multiply or divide
Enter two fractions, pick an operation and get a simplified answer.
What is a fraction calculator?
A fraction is a way of writing a part of a whole as a numerator over a denominator. This calculator does the four basic operations — addition, subtraction, multiplication and division — on two fractions, then reduces the answer to its lowest terms so you always get a clean, correct result.
Every result also shows a mixed number (a whole number plus a proper fraction) and a decimal equivalent, so it works for homework, cooking, construction measurements and quick everyday math. All calculations run locally in your browser with exact integer arithmetic — no floating-point rounding errors.
How to use it
Enter the numerator and denominator for the first fraction, choose an operation, then enter the second fraction. The answer updates automatically. If a denominator is zero the tool shows an error, because division by zero is undefined.
FAQ
How do you simplify a fraction?
Divide both the numerator and denominator by their greatest common divisor (GCD). For example, 4/6 simplifies to 2/3 because both divide by 2.
Can it handle negative numbers?
Yes. Enter a negative numerator or denominator and the sign is handled correctly in the simplified result.
Is this tool free?
Yes, completely free with no sign-up, and it runs fully offline in your browser.
Disclaimer: Results are provided as-is for educational and everyday use. Always verify critical measurements independently.