BMI Calculator
Height (in cm)
Weight (in kg)
The Physique Mass Index (BMI) Calculator can be utilized to calculate BMI worth and corresponding weight standing whereas taking age into consideration. Use the "Metric Items" tab for the Worldwide System of Items or the "Different Items" tab to transform items into both US or metric items. Notice that the calculator additionally computes the Ponderal Index along with BMI, each of that are mentioned beneath intimately.
BMI introduction
BMI is a measurement of an individual's leanness or corpulence primarily based on their peak and weight, and is meant to quantify tissue mass. It's extensively used as a basic indicator of whether or not an individual has a wholesome physique weight for his or her peak. Particularly, the worth obtained from the calculation of BMI is used to categorize whether or not an individual is underweight, regular weight, chubby, or overweight relying on what vary the worth falls between. These ranges of BMI differ primarily based on elements comparable to area and age, and are typically additional divided into subcategories comparable to severely underweight or very severely overweight. Being chubby or underweight can have vital well being results, so whereas BMI is an imperfect measure of wholesome physique weight, it's a helpful indicator of whether or not any further testing or motion is required. Consult with the desk beneath to see the completely different classes primarily based on BMI which are utilized by the calculator.
BMI desk for adults
That is the World Well being Group's (WHO) really helpful physique weight primarily based on BMI values for adults. It's used for each women and men, age 20 or older.
| Classification | BMI vary - kg/m2 |
| Extreme Thinness | < 16 |
| Average Thinness | 16 - 17 |
| Gentle Thinness | 17 - 18.5 |
| Regular | 18.5 - 25 |
| Chubby | 25 - 30 |
| Obese Class I | 30 - 35 |
| Obese Class II | 35 - 40 |
| Obese Class III | > 40 |
BMI chart for adults
This can be a graph of BMI classes primarily based on the World Well being Group information. The dashed traces symbolize subdivisions inside a serious categorization.
BMI desk for youngsters and teenagers, age 2-20
The Facilities for Illness Management and Prevention (CDC) recommends BMI categorization for youngsters and teenagers between age 2 and 20.
| Class | Percentile Vary |
| Underweight | <5% |
| Wholesome weight | 5% - 85% |
| Vulnerable to chubby | 85% - 95% |
| Chubby | >95% |
BMI chart for youngsters and teenagers, age 2-20
The Facilities for Illness Management and Prevention (CDC) BMI-for-age percentiles progress charts.
Dangers related to being chubby
Being chubby will increase the danger of various critical illnesses and well being circumstances. Beneath is a listing of mentioned dangers, in response to the Facilities for Illness Management and Prevention (CDC):
- Hypertension
- Increased ranges of LDL ldl cholesterol, which is extensively thought-about "unhealthy ldl cholesterol," decrease ranges of HDL ldl cholesterol, thought-about to be good ldl cholesterol sparsely, and excessive ranges of triglycerides
- Sort II diabetes
- Coronary coronary heart illness
- Stroke
- Gallbladder illness
- Osteoarthritis, a kind of joint illness attributable to breakdown of joint cartilage
- Sleep apnea and respiration issues
- Sure cancers (endometrial, breast, colon, kidney, gallbladder, liver)
- Low high quality of life
- Psychological diseases comparable to medical melancholy, nervousness, and others
- Physique pains and issue with sure bodily capabilities
- Typically, an elevated danger of mortality in comparison with these with a wholesome BMI
As might be seen from the listing above, there are quite a few adverse, in some circumstances deadly, outcomes that will outcome from being chubby. Typically, an individual ought to attempt to preserve a BMI beneath 25 kg/m2, however ideally ought to seek the advice of their physician to find out whether or not or not they should make any adjustments to their way of life with a view to be more healthy.
Dangers related to being underweight
Being underweight has its personal related dangers, listed beneath:
- Malnutrition, vitamin deficiencies, anemia (lowered capability to hold blood vessels)
- Osteoporosis, a illness that causes bone weak point, growing the danger of breaking a bone
- A lower in immune perform
- Development and growth points, notably in youngsters and youngsters
- Attainable reproductive points for ladies attributable to hormonal imbalances that may disrupt the menstrual cycle. Underweight girls even have a better probability of miscarriage within the first trimester
- Potential problems on account of surgical procedure
- Typically, an elevated danger of mortality in comparison with these with a wholesome BMI
In some circumstances, being underweight could be a signal of some underlying situation or illness comparable to anorexia nervosa, which has its personal dangers. Seek the advice of your physician for those who assume you or somebody you already know is underweight, notably if the explanation for being underweight doesn't appear apparent.
Limitations of BMI
Though BMI is a extensively used and helpful indicator of wholesome physique weight, it does have its limitations. BMI is barely an estimate that can't take physique composition under consideration. Resulting from all kinds of physique varieties in addition to distribution of muscle, bone mass, and fats, BMI must be thought-about together with different measurements relatively than getting used as the only real methodology for figuring out an individual's wholesome physique weight.
In adults:
BMI can't be totally correct as a result of it's a measure of extra physique weight, relatively than extra physique fats. BMI is additional influenced by elements comparable to age, intercourse, ethnicity, muscle mass, physique fats, and exercise degree, amongst others. For instance, an older one that is taken into account a wholesome weight, however is totally inactive of their every day life could have vital quantities of extra physique fats although they don't seem to be heavy. This may be thought-about unhealthy, whereas a youthful particular person with greater muscle composition of the identical BMI can be thought-about wholesome. In athletes, notably bodybuilders who can be thought-about chubby attributable to muscle being heavier than fats, it's fully potential that they're really at a wholesome weight for his or her physique composition. Typically, in response to the CDC:
- Older adults are likely to have extra physique fats than youthful adults with the identical BMI.
- Ladies are likely to have extra physique fats than males for an equal BMI.
- Muscular people and extremely skilled athletes could have greater BMIs attributable to giant muscle mass.
In youngsters and adolescents:
The identical elements that restrict the efficacy of BMI for adults also can apply to youngsters and adolescents. Moreover, peak and degree of sexual maturation can affect BMI and physique fats amongst youngsters. BMI is a greater indicator of extra physique fats for overweight youngsters than it's for chubby youngsters, whose BMI may very well be a results of elevated ranges of both fats or fat-free mass (all physique elements aside from fats, which incorporates water, organs, muscle, and many others.). In skinny youngsters, the distinction in BMI will also be attributable to fat-free mass.
That being mentioned, BMI is pretty indicative of physique fats for 90-95% of the inhabitants, and might successfully be used together with different measures to assist decide a person's wholesome physique weight.
BMI system
Beneath are the equations used for calculating BMI within the Worldwide System of Items (SI) and the US customary system (USC) utilizing a 5'10", 160-pound particular person for example:
USC Items:
SI, Metric Items:
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BMI Prime
BMI prime is the ratio of an individual's measured BMI to the higher restrict of BMI that's thought-about "regular," by establishments such because the WHO and the CDC. Although it could differ in some nations, comparable to these in Asia, this higher restrict, which will likely be known as BMIhigher is 25 kg/m2.
The BMI prime system is:
| BMI prime = |
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Since BMI prime is a ratio of two BMI values, BMI prime is a dimensionless worth. An individual who has a BMI prime lower than 0.74 is classed as underweight; from 0.74 to 1 is classed as regular; better than 1 is classed as chubby; and better than 1.2 is classed as overweight. The desk beneath reveals an individual's weight classification primarily based on their BMI prime:
| Classification | BMI | BMI Prime |
| Extreme Thinness | < 16 | < 0.64 |
| Average Thinness | 16 - 17 | 0.64 - 0.68 |
| Gentle Thinness | 17 - 18.5 | 0.68 - 0.74 |
| Regular | 18.5 - 25 | 0.74 - 1 |
| Chubby | 25 - 30 | 1 - 1.2 |
| Overweight Class I | 30 - 35 | 1.2- 1.4 |
| Overweight Class II | 35 - 40 | 1.4 - 1.6 |
| Overweight Class III | > 40 | > 1.6 |
BMI prime permits us to make a fast evaluation of how a lot an individual's BMI differs from the higher restrict of BMI that's thought-about regular. It additionally permits for comparisons between teams of people that have completely different higher BMI limits.
Ponderal Index
The Ponderal Index (PI) is just like BMI in that it measures the leanness or corpulence of an individual primarily based on their peak and weight. The principle distinction between the PI and BMI is the cubing relatively than squaring of the peak within the system (offered beneath). Whereas BMI could be a great tool when contemplating giant populations, it isn't dependable for figuring out leanness or corpulence in people. Though the PI suffers from related concerns, the PI is extra dependable to be used with very tall or brief people, whereas BMI tends to document uncharacteristically excessive or low physique fats ranges for these on the intense ends of the peak and weight spectrum. Beneath is the equation for computing the PI of a person utilizing USC, once more utilizing a 5'10", 160-pound particular person for example:
USC Items:
SI, Metric Items:
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