Empirical and theoretical relationships are developed to describe the viscosity/concentration behavior of Newtonian and non‐Newtonian emulsions having dispersed‐phase concentrations less than 74% by volume. The developed equations are valid for both oil in water and water in oil types of emulsions. Emulsions exhibiting electroviscous effect (increase in viscosity due to presence of electric charge on the surface of droplets) could also be described adequately by these equations. The proposed equations have the ability to predict the emulsion viscosity as a function of dispersed‐phase concentration and shear rate if the flow curve (shear stress versus shear rate plot) is known experimentally at a single value of the dispersed‐phase concentration.