low moderate high very high health risk
BMI = 18
Your body mass index (BMI) is calculated as exactly 18.4 kilogrammes per square metre.
Your weight is at a marginally lower level; in our view, it still should still be fine for your health. By classification of the WHO, you are "underweight".
Being slim due to fitness is good for your health. In contrast, being slim or losing weight due to nicotine, or a reduced appetite, poor digestion or a serious disease would be a bad sign. Thus, your health prospects are excellent if you do not smoke and if your weight remains stable.
SBMI = 31/70
This assessment is based on the newly developed Smart Body Mass Index. Its ideal range is between 30/70 and 39/70.
Your Smart Body Mass Index (SBMI) is calculated as 31/70 or "31 points out of 70".
A stable weight at this level can be optimal but gaining some weight by building up muscle mass could be even better.
Eat a variety of foods that you like, optimally including five servings of fruit and/or vegetables a day. Avoid eating too sweet, too fat and too much.
Do physical exercise at least for half an hour daily at moderate to vigorous intensity.
Important to know
This feedback can only be based on the inevitably limited extent of the data that you have entered here. This data has been evaluated by comparing it with the results of the most comprehensive study published so far on the BMI and its associated health risks.
The results and comments above can only give you an estimate that applies to all women at 20 years of age with a body mass index of 18, as a statistical group. They are non-personal. They should never replace medical advice. Read more...
About this calculator
What you should know about the BMI
How the body mass index is calculated and why the old formula is still in use.
12 million until September 2017