Standard energies of combustion of ricinoleic acid and methyl ricinoleate were measured experimentally by using a semi-micro bomb calorimeter. The energies of combustion of ricinoleic acid and methyl ricinoleate were used to derive the corresponding standard molar enthalpies of formation ( Delta H-f(m)circle) in liquid phase at T = 298.15 K. The values of -Delta H-f(m)circle for these compounds are (-1097.7 +/- 11.6) kJ . mol (1) and (-1027.1 +/- 12.4) kJ . mol (1), respectively. (c) 2012 Elsevier Ltd. All rights reserved.