The Trinity-Centre Collaboration uses scaled macroscopic models and dynamically similar fluid dynamics experiments to precisely calibrate numerical simulations of swimming bacteria, so that bacterial trajectories measured with microscopic images can be used as inputs to the numerical model and forces and torques on the swimming bacterial can be output from the numerical model. These techniques allow our collaboration to assess the motility of the bacteria and calculate various measures of swimming performance such as energy cost per distance, Purcell’s efficiency, and the metabolic energy cost.