Today's world sees leadership ideas used effectively in most organizations. The researcher wanted to investigate how school leaders' transformational methods affect teachers' self-efficacy sampled 160 secondary school teachers from Karachi's Federal Government Educational Institutions.Descriptive-correlational quantitative survey research. The Multifactor – Leadership Questionnaire by Bass and Avolio and the Teacher's Self-Efficacy Scale 1 (long form) by Megan Tschanmen-Moran and Mary Anita Woolfolk Hoy were adapted. SPSS was used for data analysis and treatment. A regression research found that all eleven institutional principle leadership styles affect teacher efforts with zero coefficients and further showed that two number variables had B-coefficient values of 0.06 (contingent reward) and 0.07 (effectiveness), with related probability not exactly at 0.05.Teachers' self-efficacy is anticipated to rise 0.06 and 0.07 points due to dependent awards and effectiveness. The study recommended that school principals maintain their leadership styles ranking and that more school advancements and reforms be enthusiastically recommended.