⚗️
Degree of Unsaturation Calculator
Calculate the Index of Hydrogen Deficiency (IHD)
Formula: IHD = 1 + C − (H − N + X) / 2
Where C = Carbons, H = Hydrogens, N = Nitrogens, and X = Halogens (F, Cl, Br, I). Each degree of unsaturation corresponds to 1 ring or 1 π bond (double bond).
Where C = Carbons, H = Hydrogens, N = Nitrogens, and X = Halogens (F, Cl, Br, I). Each degree of unsaturation corresponds to 1 ring or 1 π bond (double bond).
Molecular Formula Components
Calculation Results
⚠️ Oxygen and Sulfur atoms do not affect the degree of unsaturation formula and can be safely ignored. Negative IHD results indicate an invalid molecular formula.