How much weight do you have to lose if your bmi is 40.2 and you want your bmi to get down to 28.0?

To determine how much weight you need to lose to achieve a BMI of 28.0, you first need to know your height. BMI is calculated using the formula: BMI = weight (kg) / (height (m))^2. Once you have your height, you can rearrange the formula to find the target weight for a BMI of 28.0, then subtract your current weight (calculated from your BMI of 40.2) to find the weight loss required.