Electrical Formulas is an app for anybody that needs to convert the following: kVA - Amps - Single and three phase. Amps - kVA - Single and three phase. kW - kVA kVA - kW Electrical Formulas also has a Voltage Drop calculator and covers both mm2 and AWG cables for both single and three phase supplies. Electrical Formulas also has a power equation calculator, Select your voltage, then enter either amps or watts to calculate the loading.