Higher heating values (HHVs) of vegetable oils and their biodiesels were measured and correlated using linear least square regression analysis. Equations were developed for the calculation of the HHV of vegetable oils and biodiesels from their viscosity (VS) and density (DN). These equations are [image omitted] [image omitted] with coefficient of regression (r) values of 0.9858 and 0.9809, respectively. There is high regression between viscosity and higher heating value for vegetable oil and biodiesel samples. The correlations may be used for HHV estimation of mixtures of biodiesels obtained from vegetable oils.