Fraction Calculator – Add, Subtract, Multiply & Divide
Add, subtract, multiply and divide fractions, simplified.
About the Fraction Calculator
What is the Fraction Calculator?
A fraction calculator adds, subtracts, multiplies or divides two fractions and always simplifies the result.
Why use this calculator?
Recipes, measurements and schoolwork routinely split into halves and quarters; this makes the arithmetic exact and reliable.
How to use it
- Enter the numerators and denominators of both fractions.
- Choose the operation (+ − × ÷).
- Read the simplified result, mixed form and decimal.
Formula
Cross-multiply for +/−; multiply across for ×; invert-and-multiply for ÷.
Results are always reduced to lowest terms.
Frequently Asked Questions
Why do I need a common denominator?
Only for addition and subtraction — they combine like-sized parts. Multiplication and division work across directly.
What is a mixed number?
A whole part plus a proper fraction, like 2¾, shown alongside the improper fraction form.
What order of operations does this use?
It follows standard PEMDAS/BODMAS rules: parentheses, exponents, multiplication and division, then addition and subtraction.
How precise are the answers?
The calculator uses double-precision floating-point math (about 15 significant digits) and rounds the display. For exact symbolic results use dedicated algebra software.
Can I enter negative numbers or decimals?
Yes. Negative values, decimals and very large or small numbers are all supported unless a field says otherwise.
What does it mean if I get an error?
Errors usually mean an invalid input, such as division by zero or a negative value where only positives make sense. Check your entries and try again.
Is this calculator free to use?
Yes. Every calculator on this site is completely free, with no hidden fees, no subscriptions and no limits on how many times you can use it.
How accurate are the results?
We use standard, widely accepted formulas and calculate in your browser using double-precision arithmetic. Results are rounded for readability, so treat them as reliable estimates rather than a guarantee. Real-world factors can vary the true figure.
Can I add this calculator to my own website?
Yes. Open this calculator page and use the "Add to your website" box in the sidebar to copy a ready-made iframe snippet, then paste it into any HTML page.
Does it work on a phone or tablet?
Yes. The layout is fully responsive, so it works on desktops, laptops, tablets and mobile phones, and every input adapts to touch screens.