Fraction calculator
Two fractions and an operation. The answer comes back reduced, as a mixed number and as a decimal.
- Runs in your browser — nothing you enter is uploaded
- No sign-up, no quotas, free to use as often as you like
How it works
Fraction arithmetic is not hard, but it is fiddly in exactly the way that produces mistakes: common denominators for addition, flipping the second fraction for division, and then reducing the result without missing a factor.
Always in lowest terms
The answer is reduced by dividing through by the greatest common divisor, so you get 2/3 rather than 8/12. Reducing is the step most often left half-done by hand, because it is easy to spot one common factor and miss another.
Four ways of reading the answer
The result is shown as a fraction, as a mixed number, as a decimal and as a percentage. Which one is useful depends entirely on why you are asking, and converting between them by hand is its own small source of error.
Negative numbers
Negatives work in both the numerator and the denominator, and the sign is normalised onto the numerator so the answer reads the way it should: −2/3 rather than 2/−3.
Division by zero
A zero denominator, or dividing by a fraction that equals zero, is reported as an error rather than returning infinity.
Fraction calculator — questions
Does it show the working?
It shows the question and the answer in four forms. The intermediate common-denominator step is not printed.
Can I use mixed numbers as input?
Not directly. Convert to an improper fraction first — two and a half becomes 5/2.
Does it handle negatives?
Yes, and the sign is placed on the numerator so the result reads naturally.
Is the answer always reduced?
Yes, always, using the greatest common divisor.
Is anything sent anywhere?
No. It is arithmetic in your browser.