Least Common Denominator Calculator LCD of two fractions. Denominator 1 Denominator 2 LCD 12 Step-by-step with your numbers: 1. Values used: 2. Denominator 1 = 4 3. Denominator 2 = 6 4. LCD = 12 Did we solve your problem today? 👍 Yes 👎 No Thanks for the feedback! LCD = LCM of denominators. FAQ Use? Adding fractions with different denominators. Related calculators LCM Calculator Find the least common multiple of two numbers. Adding Fractions Calculator Add two fractions and simplify the result. GCF Calculator Find the greatest common factor of two numbers.