Add, subtract, multiply, and divide mixed numbers instantly
Inputs
Format: whole numerator/denominator (e.g. 1 3/4), a fraction (3/4), or a whole number (5). Prefix with - for negatives.
Try an example
Result
How mixed number arithmetic works
A mixed number calculator lets you perform arithmetic on mixed numbers — numbers written as a whole part plus a proper fraction, such as 2 3/4. Whether you need to add mixed numbers for a recipe, subtract them for a woodworking measurement, multiply them for scaling, or divide them for unit conversions, this tool gives you the simplified result and a clear step-by-step breakdown instantly.
Type the whole number, a space, then the fraction — for example: 1 3/4. You can also enter a plain fraction like 3/4 or a whole number like 5. Prefix with a minus sign for negative values, e.g. -2 1/8.
Converting to improper fractions (e.g. 1 3/4 becomes 7/4) makes arithmetic straightforward and avoids errors. The tool then simplifies the result using the GCD and converts back to a mixed number for you.
After computing the answer as an improper fraction, the calculator divides numerator and denominator by their greatest common divisor (GCD) to reach the lowest terms, then extracts the whole-number part to form the final mixed number.
Yes. Prefix any mixed number with a minus sign (e.g. -1 1/4) and the calculator will correctly apply the sign throughout the operation, including when adding a negative to a positive or subtracting a larger value from a smaller one.