The objectives of this work are to submit the heating value studies related to mathematical modeling of biomass fuels based on experimental data published in the last twenty-five years. There was a linear relationship between parameters that make up the physical composition, proximate analysis, and elemental analysis towards the energy content of biomass. It is possible to build models based on data from physical composition, proximate and elemental analysis using regression analysis. The experimental determination of heating value and ultimate analysis requires special instrumentation, whereas chemical and proximate analysis data from biomass and vegetable oil samples can be obtained relatively easily by using common laboratory equipment.