This research project aimed to estimate values of active drag over a range of swimming velocities. The data required to do this was the passive drag values for the swimmer at various swim velocities, together with the active drag force value for the individual at their maximum swim velocity. The drag force is represented by an exponential equation , where and are constants for a particular swimmer. The constant (passive) reflects the more innate characteristics of the individual swimmer and their suitability to aquatics motion. The constant (active- passive) reflects the efficiency of the swimmer’s technique. In both cases, the lower the constant’s value, the better suited the swimmer is to aquatics motion or to technical efficiency. The and the provide an index to evaluate a swimmer’s capabilities.