Fraction Calculator

The Fraction Calculator adds, subtracts, multiplies or divides two fractions and automatically simplifies the result to its lowest terms — the step that's easiest to forget when doing fraction arithmetic by hand. It understands plain fractions like `3/4`, mixed numbers like `1 1/2`, negative fractions like `-3/4`, and whole numbers like `5`, so you can mix formats freely between the two input fields.

Behind the scenes, addition and subtraction find a common denominator by cross-multiplying, multiplication multiplies numerators and denominators directly, and division multiplies by the reciprocal — the same rules taught in every math class, just applied without arithmetic mistakes. Every result is reduced using the greatest common divisor of the numerator and denominator, so `2/4` always comes back as `1/2`, never left unsimplified.

The result is shown three ways at once: as a simplified fraction, as a mixed number (useful when the result is an improper fraction greater than one, like `7/2` showing as `3 1/2`), and as a decimal rounded to six places — covering whichever format your homework, recipe or measurement needs. Dividing by a zero fraction is caught and flagged as an error rather than silently returning an infinite or wrong result.

As with every calculator here, everything runs locally in your browser, is completely free, and works the same on a phone as on a desktop — useful for checking fraction homework or a recipe conversion without waiting for a page to load a heavier app. It's built for students who need to show simplified working, for anyone scaling a recipe up or down by a fraction, and for quick unit-of-measurement math like adding 3/8 inch to 1/4 inch on a tape measure without reaching for a phone's built-in calculator, which typically can't handle fractions at all.