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Adding Fractions Calculator

Adding Fractions Calculator

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Calculator Scope
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This calculator finds a common denominator, adds the numerators, and simplifies the result, e.g. 1/4 + 1/6 = 5/12.

Adding two fractions with different denominators means finding a common denominator first, a step that's straightforward in principle but easy to get wrong when the numbers don't share an obvious common multiple. Enter any two fractions here and this calculator finds the least common denominator automatically, adds the numerators, and simplifies the result — along with its decimal equivalent for a quick sanity check. There's no need to match denominators yourself beforehand; the calculator handles that conversion behind the scenes.

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  • How addition works: convert both fractions to the least common denominator (LCM of the two denominators), add the numerators, then simplify.
  • You never need matching denominators first — the calculator handles the conversion automatically.
  • The result is always shown fully simplified, along with its decimal equivalent.

How do I add fractions with different denominators?

Find a common denominator (the least common multiple of both denominators), rewrite each fraction over it, add the numerators, and simplify.

What is 1/4 + 1/6?

The LCM of 4 and 6 is 12: 1/4 = 3/12 and 1/6 = 2/12, so 3/12 + 2/12 = 5/12.