Final answer:
BMI is a common measure of healthy body weight that estimates body fatness based on height and weight, but has limitations for individual assessments.
Step-by-step explanation:
The common measure of healthy body weight is Body Mass Index (BMI). BMI is calculated using height and weight measurements to provide an estimate of body fatness. It helps indicate if an individual might be underweight, with a BMI less than 18.5, normal weight with a BMI from 18 to 24.9, overweight with a BMI over 25, and obese with a BMI over 30. It's important to note that while BMI is useful for assessing populations, it has limitations when applied to individuals, as it does not distinguish between muscle and fat mass.