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Math Calculators

LCD Calculator (Least Common Denominator)

Find the least common denominator (LCD) shared by a list of fraction denominators.

Enter the denominators of each fraction, separated by commas or spaces.
Least common denominator —
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About the LCD Calculator (Least Common Denominator)

The least common denominator is the smallest number that every denominator in a group of fractions divides into evenly. Once fractions share an LCD, they can be added or subtracted directly.

Formula: LCD = LCM of all denominators, computed pairwise using LCM(a, b) = (a × b) ÷ GCD(a, b)

Finding the LCD is the essential first step before adding or subtracting fractions with different denominators.

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