Body Mass CDC Calculator

Metric uses kilograms and centimetres; US uses pounds with feet and inches; UK uses stones and pounds.
Body weight: kilograms (metric), pounds (US) or whole stones (UK).
Only used with UK stones-and-pounds: the pounds part, e.g. 11 st 4 lb is weight 11 and extra pounds 4.
Used when the unit system is metric.
Used when the unit system is US or UK.
The inches part of a feet-and-inches height.
Adult categories apply from age 20. Under 20, BMI must be read against a growth chart instead.
Adult BMI cut-points are the same for men and women; sex is used only for the interpretation notes.
BMI
10.96 kg/m^2
BMI Calculator
Category
Underweight
Healthy BMI range
18.5 - 24.9
Healthy weight, lower
53.58 kg
Healthy weight, upper
72.11 kg
Healthy weight, lower
118.1 lb
Healthy weight, upper
159.0 lb
Weight to lose (+) or gain (-) to reach the healthy range
-21.83 kg
BMI prime (BMI / 25)
0.439
Ponderal index
6.44 kg/m^3
Weight used
31.75 kg
Height used
170.2 cm
Classification table used
CDC adult BMI categories (United States)
Worked out from World Health Organization - Body mass index (BMI) and the international classification of adult underweight, overweight and obesity and 4 other sources.
That BMI is outside the range the classification tables were built for - check the height and weight entered.
WHO recommends lower action points (23 and 27.5) for people of South Asian, Chinese and other Asian ancestry; switch the classification table if that applies.
BMI is a population screening measure, not a diagnosis. It does not distinguish muscle from fat and is not valid for children and teenagers, during pregnancy, or for highly muscular people. Discuss any weight concern with a clinician.

How this is worked out

5 steps
  1. Weight = 70.0 lb = 31.751 kg
  2. Height = 170.2 cm = 1.7018 m, so height squared = 2.8961 m^2
  3. BMI = 31.751 / 2.8961 = 10.96 kg/m^2
  4. CDC adult BMI categories (United States): 10.96 falls in "Underweight". CDC uses the same cut-points as WHO and names 18.5-24.9 the healthy weight range.
  5. Healthy weight for this height = 18.5 to 24.9 x 2.8961 = 53.58 to 72.11 kg

Results are general information, not financial, tax, legal, medical or engineering advice.