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Use of the Pirt and Luedeking-Piret equations permits the determination of the effect of medium composition on the metabolic patterns of Megasphaera elsdenii grown in minimal and complex media with lactate as the major carbon source. To establish the significance of the parameters involved in the Pirt and Luedeking-Piret equations, a quantitative statistical criterion was proposed. In the complex medium, lactate was completely used for growth and product formation, whereas in the minimal medium a fraction of the energy obtained from lactate was used for maintenance purposes. Modeling of VFA production by the Luedeking-Piret equation showed that, independent of the type of medium, acetate and propionate are growth-associated products, while butyrate and valerate are only partially growth-associated. The growth-associated products are related to energy-yielding metabolism and the non-growth-associated products are related to the consumption of reducing equivalents.