Degree of Unsaturation Calculator

Calculate index of hydrogen deficiency (IHD)

Note: IHD = 1 + C − (H − N + X)/2. Each IHD = one ring or one π bond.

Molecular Formula

Carbon (C)

Hydrogen (H)

Nitrogen (N)

Halogens (X)

⚠️ For educational purposes only. Verify results with a qualified professional when making important decisions.

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