Overview
What Is LCD?
The Least Common Denominator (LCD) is the smallest number that all given denominators divide into evenly, essential for adding or subtracting fractions.
Find the least common denominator of fractions.
The Least Common Denominator (LCD) is the smallest number that all given denominators divide into evenly, essential for adding or subtracting fractions.
Useful for finding a common denominator before adding or subtracting fractions.
Input the denominators separated by commas.
The result updates automatically.
Finding a common denominator to add or subtract fractions with different denominators.
Yes, LCD is simply LCM applied specifically to a set of denominators.
Convert each fraction to have the LCD as its denominator, then add the numerators.
Yes, if one denominator is a multiple of all others, it can serve as the LCD.
No, calculations happen entirely in your browser.
Any number of denominators - the calculator finds the LCD across all of them.
Then the LCD is simply that same number.
This calculator handles numeric denominators - algebraic denominators with variables need different techniques.
Denominators are conventionally treated as positive for LCD calculations.
Yes, completely free with no sign-up required.