The article discusses the need for a transformer design software program that can be easily used by beginners in the field without the need for trial and error. Most small-sized transformer manufacturers in South Korea do not use such software due to the high price, instead relying on spreadsheets like Excel. The present study aims to overcome the problems of conventional methods by finding a design method that does not require expert knowledge and obtaining all possible designs to avoid missing optimal values. The developed software program is introduced and its usefulness is demonstrated experimentally in various chapters of the paper.