Body Mass Index Calculator
- Other physiology tools:
- A Body Shape Index
- Corpulence Index
- Mean Arterial Pressure
- Trefethen's New BMI
- and many more »
When submitting your data and referring to the results, please keep in mind that this tool and the tables below are only for educational and illustrative purposes.
| Category | BMI (kg/m2) | BMIprime* |
|---|---|---|
| Underweight | 18.5 or less | 0.740 or less |
| Normal (healthy) weight | 18.5 to 24.9 | 0.740 to 0.996 |
| Overweight | 25.0 to 29.9 | 1.000 to 1.196 |
| Obese Class I (Moderately obese) | 30.0 to 34.9 | 1.200 to 1.396 |
| Obese Class II (Severely obese) | 35.0 to 39.9 | 1.400 to 1.596 |
| Obese Class III (Very severely obese) | 40.0 or more | 1.600 or more |
| *BMIprime = BMI/25. For populations in South East Asia and South China, it is recommended to calculate BMI Prime using an upper limit BMI of 23 in the denominator instead of 25. This allows for easy comparison between populations that have different optimal upper-limit BMI values, as enabled by the BMI Prime calculation.
BMI categories defined by the World Health Organization. The WHO regards an adult BMI of less than 18.5 as underweight and possibly indicative of malnutrition, an eating disorder, or other health problems, while a BMI of 25 or more is considered overweight and 30 or more is considered obese (WHO, 2005; 1995). | ||
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Body Mass Index (2023, January 5). In Wikipedia. https://en.wikipedia.org/wiki/Body_mass_index
CDC (2022, June 3). About Adult BMI. https://www.cdc.gov/healthyweight/assessing/bmi/adult_bmi/index.html
CDC (2022, September 2). Adult BMI Calculator. https://www.cdc.gov/healthyweight/assessing/bmi/adult_bmi/english_bmi_calculator/bmi_calculator.html
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