Add, subtract, multiply, or divide fractions — simplified instantly
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A fraction calculator lets you add, subtract, multiply, and divide any two fractions instantly and shows the result in its simplest form. Whether you are doing homework, cooking, or working with measurements, this free online tool handles all fraction arithmetic, displays the decimal equivalent and mixed number, and walks you through every step of the solution.
Find the least common denominator (LCD) of the two fractions, convert each fraction so it has the LCD as its denominator, then add the numerators together and simplify. For example, 1/2 + 1/3 shares an LCD of 6, giving 3/6 + 2/6 = 5/6.
To divide by a fraction, multiply by its reciprocal. Flip the second fraction (swap numerator and denominator), then multiply the two fractions together and simplify the result. For example, 7/8 ÷ 7/4 = 7/8 × 4/7 = 28/56 = 1/2.
A fraction is in its simplest form when the numerator and denominator share no common factor other than 1. The calculator divides both numbers by their greatest common divisor (GCD) automatically, so 6/8 becomes 3/4.
Yes. Enter a negative number as the numerator (e.g., -3 over 4) and the calculator will correctly compute and simplify the result, keeping the negative sign in the numerator of the final answer.