Denominators are handled automatically using the lowest common denominator, and improper fractions are converted to mixed numbers for readability. It is a practical helper for homework checks, recipes, woodworking measurements and any situation where halves, thirds and sixteenths appear.
Calculator
Formula used
a/b ± c/d = (ad ± bc) / bd · a/b × c/d = ac / bd · a/b ÷ c/d = ad / bc
How to use the Fraction Calculator
- Enter the first fraction as numerator over denominator.
- Choose the operation: add, subtract, multiply or divide.
- Enter the second fraction.
- Optionally use the simplify panel for a single fraction.
About this tool
The Fraction Calculator is built for speed and accuracy: every calculation runs in your browser, so your data never leaves your device and the result updates as you type. It works equally well on a phone, a tablet or a desktop, and it is free to use as many times as you like.
Common use cases
- Checking fraction homework.
- Doubling or halving recipe quantities.
- Adding measurements in inches or cups.
- Converting fractions to decimals for a spreadsheet.
Tips for the best result
- Use the latest figures you have - even a small change in rate or term can shift the outcome by hundreds.
- For annual figures, divide by 12 to get a monthly number you can compare with the result.
- Bookmark this page and revisit the calculation as the inputs change.
Frequently asked questions
Can it handle mixed numbers?
Results are shown both as an improper fraction and as a mixed number, so you can read whichever form you need.
What if my denominator is zero?
Division by zero is undefined. Enter a non-zero denominator to get a valid result.
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