Body frame size is another factor that can have a significant impact on the measurement of ideal weight. Body frame size is typically categorised as small, medium, or large-boned. It is measured based on the circumference of a person's wrist in relation to their height, as shown below. For women: Height under 5'2 small boned = wrist size less than 5.5 Medium boned = wrist size 5.5 to 5.75 Large-boned = wrist size over 5.75 Height between 5'2 and 5' 5 Small boned = wrist size less than 6 Medium boned = wrist size 6 to 6.25 Large-boned = wrist size over 6.25 Height over 5' 5 Small boned = wrist size less than 6.25 Medium boned = wrist size 6.25 to 6.5 Large-boned = wrist size over 6.5 For men: Height over 5' 5 mall boned = wrist size 5.5 to 6.5 Medium boned = wrist size 6.5 to 7.5 Large-boned = wrist size over 7.5. A person who is largely boned will naturally weigh more than someone who is small-boned, even at the same height, making body frame size a factor that can affect measurements such as IBW and BMI.