Shows the working
Every answer lists the combined fraction, the GCD it was divided by and the reduced result, so you can follow the method rather than just copy an answer.
Fraction Calculator (Add, Subtract, Multiply, Divide)
Add, subtract, multiply or divide two fractions and get a simplified answer.
- Input
- No upload needed — instant
- Privacy
- Nothing is uploaded
- Cost
- Free · no sign-up · no watermark
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Processed entirely on your device
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Overview
About the Fraction Calculator (Add, Subtract, Multiply, Divide)
Add, subtract, multiply or divide two fractions and get the answer simplified, as a mixed number and as a decimal, with the working shown step by step.
A fraction calculator saves the fiddly work of finding common denominators and reducing answers. Enter two fractions, pick an operation, and this tool returns the result simplified, as a mixed number and as a decimal — with the intermediate steps shown so you can check the method.
How each operation works
a/b + c/d = (a·d + c·b) / (b·d)
a/b − c/d = (a·d − c·b) / (b·d)
a/b × c/d = (a·c) / (b·d)
a/b ÷ c/d = (a·d) / (b·c)Addition and subtraction combine over the common denominator b × d; division flips the second fraction and multiplies.
Why the answer is always reduced
After combining, the numerator and denominator are divided by their greatest common divisor (Euclid's algorithm). That is why 2/4 returns as 1/2 and 6/8 as 3/4, with no manual simplifying.
Private and instant
Everything runs in your browser using exact integer arithmetic. Nothing you type is uploaded, and there is no sign-up.
Step by step
How to use the Fraction Calculator (Add, Subtract, Multiply, Divide)
Choose the operation — add, subtract, multiply or divide.
Enter the numerator and denominator of each fraction.
Read the simplified result, the mixed number and the decimal, with the working.
Why use it
Benefits and common use cases
What this tool is good for, and what it deliberately does not try to do.
Three forms at once
Get the improper fraction, the mixed number and the decimal together, which is handy for homework, cooking and measurements.
Always simplified
Results are reduced by the greatest common divisor, so 2/4 comes back as 1/2 with no extra step.
Questions
Frequently asked questions
Short, honest answers about quality, limits and privacy.
How do I add or subtract fractions?
Give them a common denominator, then add or subtract the numerators. This calculator uses b × d as the common denominator: a/b + c/d = (a·d + c·b) / (b·d), then reduces the result.
How do I divide fractions?
Flip the second fraction and multiply — a/b ÷ c/d becomes a/b × d/c = (a·d)/(b·c). Dividing by zero, or by a fraction whose numerator is zero, is undefined, so the calculator returns no result.
What is a mixed number?
A whole number plus a proper fraction, such as 3 1/2. It is just another way to write an improper fraction like 7/2, and the calculator shows both.