Problem. The advantages of the electric car (EV) are well-known – it is environmentally friendly, quiet and the most important feature is a radical reduction in the cost of operating the EV compared to a conventional car with an internal combustion engine. Cost savings are due to the fact that its "refueling" comes from a conventional electrical outlet. No need to periodically change engine oil, filters, belts and other consumables. Also, you will spend less time and money on maintenance. So, by converting traditional cars from internal combustion engines to EVs, you are making your best and real contribution to improving the ecological space around you. Goal. The goal is conducting a study on the conversion of the car from the internal combustion engine to the EV with the calculation of the payback period of the converted car. Methodology. Analytical methods of research on the methods of conversion of traditional cars from internal combustion engines to EV were used as well as the physical methods of calculating the action of forces acting on the car and determining the speed of its movement. Also, the methods of experimental research and mathematical methods of processing and modulation of the obtained results and the methods of calculating technical and economic indicators were used. Results. The study was conducted on the conversion of the car from an internal combustion engine to an EV. The main elements of re-equipment were considered. The analysis was carried out and the sequence of actions on definition of power of the electric motor for the electric car was offered. The calculation of economic indicators of car conversion on the basis of ZAZ "Sens" in EV was performed. The results of the calculation show that in the 3rd year of operation of the converted car the cost of conversion will be reimbursed. Originality. On the example of ZAZ "Sens" the power of the traction motor for its conversion into EV was calculated. The graphical dependence of the traction motor power on the EV speed was constructed. The calculations and the dependence of the power of the traction motor on the road slope when moving EV at a certain speed were performed. Practical value. Conversion of cars from internal combustion engines to EV is expedient and economically advantageous for companies engaged in various services for the delivery of goods within the city. Also, it is beneficial to companies and firms engaged in car rental. But here it should be borne in mind that a well-developed charging infrastructure is required within the city.