basic

Degree of Unsaturation from Molecular Formula Calculator

DoU = (2C + 2 + N − H − X) / 2 — counts rings and pi bonds.

Calculates the Degree of Unsaturation (DBE/IHD) of an organic compound from its molecular formula. Each ring or double bond contributes 1; each triple bond contributes 2.

Dr. Helena Ortiz By Dr. Helena Ortiz
Published Last reviewed 1 min read

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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

DoU = (2C + 2 + N − H − X) / 2

In depth

Calculates the Degree of Unsaturation (DBE/IHD) of an organic compound from its molecular formula. Each ring or double bond contributes 1; each triple bond contributes 2.