Background: Malnutrition is a common cause of morbidity and mortality amongst children with TOF. Objective: To analyze the BMI profile of children with TOF age 0 – 18 years old at Pediatric Department, Dr. Soetomo General Hospital, Surabaya. Material and method: A cross-sectional study of the BMI from the medical record of TOF patients age 0 – 18 years old at the Pediatric Department, Dr. Soetomo General Hospital, Surabaya since January 2016 to December 2017 was conducted. The data included gender, age group, demographic distribution, weight, and height. BMI was calculated by WHO formula reference; body weight (kg) divided by height squared body (m2), which was converted into z-score histogram size. BMI classification was guided by the Government’s Anthropometry Standards for Nutritional Status Assessment. Result: From 84 TOF patients, there were 43 males (51%) and 41 females (49%). The most dominant age group is 0 – 4 years old (n=47;56%). The majority of patients were from outside of Surabaya (n=64;76,2%). Based on their BMI, 36 patients (42.9%) have severe underweight, 10 patients (11.9%) were underweight, and 35 patients (41.7%) were normal, whilst the rests (3.6%) were overweight. Conclusion: In this study, the number of male patients was slightly higher than female patients. The majority of TOF patients were 0 – 4 years old and resided out town of Surabaya. The predominant BMI found was the underweight and severe underweight below of normal BMI.