Adding Fractions Calculator
Enter two fractions to see their exact sum, conversion steps, mixed-number form, and decimal check.
A QUICK WALKTHROUGH
How to use this tool
- Enter integer numerators and non-zero denominators.
- Choose whether to show an improper result as a mixed number.
- Calculate and review the LCD, converted fractions, and simplified sum.
Exact rational arithmetic
All fraction operations use BigInt integer arithmetic. No floating-point value is used to determine the exact result.
Defined input limits
Use signed integers with up to 1,000 digits per field. Denominators must be non-zero; the final denominator is normalized positive.
Local processing
Inputs stay in this browser and are not uploaded.
GOOD TO KNOW
Common questions
Can denominators differ?
Yes. The tool computes the least common denominator and shows both converted fractions.
Are negative fractions supported?
Yes. Signed numerators and denominators are accepted and normalized.
Is the decimal exact?
The fraction is exact; the decimal display is truncated to at most 12 places, not rounded.