A great app to have when building a Tesla Coil! This calculates the necessary values for the various parts of a Tesla Coil, and makes life easy going. Metric Friendly! Double-Tap an input to get conversion options! Spark Length. Capacitor-Transformer Match. Plate Capacitor. Multi-Mini-Capacitor. LC Resonant Frequency. Helical Coil. Flat Spiral Coil. Inverse Conical Coil.