Result
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Classification: Fill in the fields
Ideal weight: Fill in the fields
Also see:
Classification table How BMI is calculated Curiosities about BMIHow BMI is calculated
Expression:
$$\text{IMC} = \frac{\text{peso }}{\text{altura}^2}$$
In which:
| Variable | Unit of measurement | Symbol |
|---|---|---|
| BMI | Kilograms per square meter | Kg/m2 |
| weight | Kilograms | Kg |
| height | Meter | m |
BMI Classification Table for adults
| # | Classification | BMI (kg/m²) | Description |
|---|---|---|---|
| 1 | Underweight | Less than 18.5 | Insufficient body weight for height. Increased risk of health problems. |
| 2 | Normal weight | 18.5 to 24.9 | Appropriate weight for height. Low risk of weight-related health problems. |
| 3 | Overweight | 25,0 a 29,9 | Excess weight for height. Moderate increase in risk of chronic diseases. |
| 4 | Obesity Grade I | 30,0 a 34,9 | Light obesity. Increased risk of diseases such as diabetes, hypertension, and cardiovascular diseases. |
| 5 | Obesity Grade II | 35,0 a 39,9 | Moderate obesity. Very high risk of chronic diseases and complications. |
| 6 | Obesity Grade III | Greater than or equal to 40.0 | Severe or morbid obesity. Extremely high risk of severe diseases and reduced life expectancy. |
Note that, if the BMI value is, for example, 24.95, it will be considered 'Normal weight' since overweight starts at a BMI of 25.00.
Curiosities about BMI
- The BMI was created in 1832 by Adolphe Quetelet, a Belgian astronomer and mathematician.
- Originally, it was not intended for individual diagnosis, but for population studies.
- The World Health Organization (WHO) adopted the BMI as the global standard in 1995.
- Used in medical check-ups, scientific research, and even life insurance.
- It helps in the early detection of health risks such as diabetes and heart disease.
- Fundamental for epidemiological analysis and public health planning.
- Does not differentiate muscle mass from body fat.
- It may underestimate risks in people with abdominal fat.
- Less effective for children, the elderly, and high-performance athletes.
- Small changes in height strongly impact the BMI.
- Alternatives such as WCQ (waist-to-hip ratio) assess fat distribution.
- Tests such as bioimpedance and DEXA provide more accurate body analysis.
- Studies show that BMI outside the ideal range is associated with lower longevity.
- A person can have a normal BMI but be metabolically unhealthy — the famous 'skinny fat'.
- BMI is just one of the factors used to assess overall health.