 Magnetic stimulation of peripheral nerves requires high currents, which are generated by large, expensive, and complex devices. These limitations make magnetic stimulation unsuitable for some applications such as rehabilitation therapies. To overcome these challenges, the geometry of the magnetic coils must be carefully considered. This study investigated the electric field distribution of 14 different coil geometries at a typical peripheral nerve stimulation, with a 27 mm distance between axon and coil. Field strength and focality were determined using electromagnetic field simulations. Additionally, the activating function along the axon was calculated, which quantified the efficiency of neuronal stimulation. Power efficacy was also evaluated based on ohmic losses. Results showed that power efficacy could be improved by up to 40% with optimized coil designs. This article was authored by Philip Braun, Jonathan Rapp, Werner Hemmert, and others. We are article.tv, links in the description below.