Fraction Calculator
Add and simplify fractions.
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About Fraction Calculator
The fraction calculator adds, subtracts, multiplies, or divides two fractions. Enter a numerator and denominator for each fraction, pick an operation, and it instantly reduces the answer to lowest terms using the greatest common divisor, then shows it as an improper fraction, a mixed number, and a decimal.
It is completely free and runs entirely in your browser. Nothing you type is uploaded or stored on a server, so every calculation happens locally on your own device. Zero denominators and division by zero are caught and flagged instead of producing errors.
Frequently asked questions
- Is the fraction calculator free to use?
- Yes, it is completely free with no sign-up, account, or limits. You can add, subtract, multiply, and divide as many fractions as you like at no cost.
- Is my data uploaded anywhere?
- No. All calculations run entirely in your browser on your own device. Nothing you enter is sent to a server, saved, or shared, so your inputs stay private.
- How does it reduce a fraction to lowest terms?
- After computing the result, the tool finds the greatest common divisor (GCD) of the numerator and denominator and divides both by it, giving the fully simplified fraction. It also normalizes the sign so the denominator stays positive.
- What is the difference between the improper fraction and mixed number shown?
- An improper fraction like 7/4 keeps the value as a single fraction where the numerator can exceed the denominator. A mixed number like 1 3/4 splits it into a whole part plus a proper fraction. The tool shows both, plus a decimal.
- What happens if I enter a denominator of zero?
- A denominator of zero is mathematically undefined, so the tool displays a clear error message instead of a result. It also blocks dividing by a fraction that equals zero.
- Can it handle negative fractions?
- Yes. You can enter negative numerators or denominators, and the calculator handles the signs correctly, always presenting the reduced result with a positive denominator.