I agree, “BMI is a reasonable guide to a healthy weight”. It is not perfect but it will let you know if you are underweight or obese, generally. I see BMI more as a tool to assign individuals to groups for statistical purposes.

The relative fat mass formula seems promising as waist size is a good indicator for obesity although it does require some knowledge of what an appropriate fat mass is for your gender/age.

Next step is to look at how much you should weigh. Ideal Body Weight can do this. To calculate: Female: 100 lbs for first 5 ft, + 5 lbs for each additional inch Male: 106 lbs for the first 5 feet, + 6 lbs for each additional inch

Remember not all fat is created equally either! Your fat stores are built from what you eat. Olive oil, coconut oil, butter, and avocado oil are not the same as highly processed canola and soybean oil.