Heightcm
Weightkg
BMI
Severely underweight < 16
Underweight 16 - 17
Slight underweight 17 - 18.5
Normal 18.5 - 25
Overweight 25 - 30
Obese Class I 30 - 35
Obese Class II 35 - 40
Obese Class III ≥ 40

If a part is missing,
mass needs to be corrected.
Hand
Fore arm
Upper arm
Feet
Lower leg
Thigh

Description at Wikipedia

deesBody mass index
Online calculators