➗Fraction Calculator
Add, subtract, multiply, or divide two fractions with the answer simplified automatically.
Free Fraction Calculator
This fraction calculator handles addition, subtraction, multiplication, and division of two fractions, with every result automatically simplified to lowest terms using the greatest common factor. Addition and subtraction find a common denominator first; multiplication multiplies straight across; division multiplies by the reciprocal.
Each answer is shown as a simplified fraction, a decimal, and — where applicable — a mixed number, with the working shown step by step so you can follow exactly how the result was reached.
Free, instant, and runs entirely in your browser — no sign-up required.
About the Fraction Calculator
Features
Four operations
Add, subtract, multiply, and divide.
Auto-simplified
Every result reduced to lowest terms.
Mixed number and decimal
See the answer in multiple formats.
Instant, private
Runs entirely in your browser. No data is sent anywhere.
Frequently Asked Questions
How do you add fractions with different denominators?
Find a common denominator (typically the LCM of the two denominators), rewrite both fractions over it, then add the numerators and keep the common denominator.
How do you multiply fractions?
Multiply the numerators together and the denominators together — no common denominator is needed for multiplication.
How do you divide fractions?
Multiply the first fraction by the reciprocal (flipped version) of the second fraction — dividing by a fraction is the same as multiplying by its inverse.
Why is my answer automatically simplified?
The calculator divides the numerator and denominator by their greatest common factor so the fraction is always shown in lowest terms.
Can I use negative numbers?
Yes — enter a negative sign on the numerator or denominator, and the calculator handles the sign correctly in the result.
What happens if I enter a denominator of zero?
Division by zero is undefined, so the calculator shows an error rather than a result if either denominator is zero.
What's a mixed number?
A mixed number combines a whole number and a proper fraction, like 1 1/2 instead of 3/2 — the calculator shows this alongside the simplified fraction.
Can I enter improper fractions?
Yes — a numerator larger than the denominator (like 7/4) works fine and is converted to a mixed number in the results.
Does this work with whole numbers?
Yes — enter a whole number as a fraction over 1, such as 5/1, and it will combine correctly with any other fraction.
Is this calculator free to use?
Yes, completely free with no sign-up, and it runs entirely in your browser.