Calculate Your BMI and Excess Weight Your Weight(kg): Your Height(cm): Your BMI: This Means: Your Ideal Weight (kg): Your Excess Weight (kg): On the average sleeve gastrectomy results in loss of 60% of the excess weight1*. (* Results may vay from person to person). Amount of weight loss (in kg) achievable with Sleeve Gastrectomy : Healthy Weight:(BMI 18-24.9) Overweight:(BMI 25-29.9) Obese - Class1:(BMI 30-34.9) Obese - Class2:(BMI 35-39.9) Obese - Class3:(BMI > 40)