LCD Calculator – Least Common Denominator

Find the lowest common denominator of fractions, integers, and mixed numbers

Enter Numbers to Calculate LCD

Fraction 1
Fraction 2
Fraction 3 (optional)
Fraction 4 (optional)

Calculation Results

Least Common Denominator (LCD)

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Least Common Denominator (LCD)

The least common denominator (LCD) is the smallest number that can be a common denominator for a set of fractions. Also known as the lowest common denominator, it is the lowest number you can use in the denominator to create a set of equivalent fractions that all have the same denominator.

How to Find the LCD of Fractions, Integers and Mixed Numbers

  1. Convert integers and mixed numbers to improper fractions
  2. Find the LCD of all the fractions
  3. Rewrite fractions as equivalent fractions using the LCD

Example

Find the LCD of: 1 1/2, 3/8, 5/6, 3

  1. Convert to fractions: 3/2, 3/8, 5/6, 3/1
  2. Find the LCD of denominators 2, 8, 6, 1
  3. LCD = 24
  4. Equivalent fractions: 36/24, 9/24, 20/24, 72/24