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The enthalpies of formation (∆H°f) of twenty one amidyl radical (R • ) belonging to the formamidyl homological series were calculated using the published values of R-H bond dissociation energies. Among them, the ∆H°f values of nine radicals were first calculated and those of eight radicals were refined. Most of the ∆H°f values of corresponding starting mol ecules RH (∆H°f(RH)) were obtained using the macroincrementing schemes. Based on the group additivity scheme, the "structure-enthalpy of formation" relationships for the radicals considered were examined, the ∆H°f(R • ) values were analyzed, and their reliability was con firmed. Parameters for calculating the ∆H°f values of radicals belonging to this homologous series were suggested.