Least Common Denominator (LCD) Calculator (Free)
Use this free least common denominator (LCD) calculator to prepare fractions for adding or subtracting. Enter your fractions and you’ll get the LCD — the least common multiple of the denominators — and each fraction rewritten with that denominator.
How to use the calculator
- Enter two or more fractions, separated by commas (for example 1/4, 1/6, 3/8).
- Press Calculate.
- Read the LCD and the rewritten equivalent fractions.
What is the LCD?
The least common denominator is the smallest number that every denominator divides into — the least common multiple of the denominators. Once each fraction is rewritten with the LCD, you can add or subtract the numerators directly.
Frequently asked questions
How do you find the least common denominator?
Take the least common multiple of all the denominators. For 1/4 and 1/6 the LCD is 12.
Why do fractions need a common denominator?
You can only add or subtract fractions that share a denominator, because the pieces must be the same size.
Does it rewrite the fractions for me?
Yes — each fraction is converted to an equivalent fraction with the LCD as the denominator.
Read the full lesson: learn the method step by step.
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