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