The higher heating value (HHV) at a constant pressure measures the enthalpy change of combustion with water condensed. The HHVs of 7 species of biomass shells were correlated with their lignin, fixed carbon, and volatile material contents. There was a highly significant correlation between the HHV of the fruit shells and the lignin, fixed carbon, and volatile material contents. The HHVs (MJ/kg) of the biomass shells as a function of lignin (LC), fixed carbon (FCC), and volatile material (VMC) contents were calculated using the following equations:HHV=0.0864 (LC)+16.6922, (2)HHV=-0.066 (FCC) 2+0.5866 (FCC)+8.752, (3)HHV=-0.0066 (VMC) 2+0.7371(VMC)+1.2305 (4)for Equations (2)-(4), which in square of the correlation coefficients (r(2)) were 0.9734, 0.8281, and 0.8281, respectively.