How to Calculate BMI: Formula, Categories & Limitations
Body Mass Index (BMI) is a simple calculation that compares weight with height. It is widely used as a screening measure because it is quick and inexpensive, but it is not a direct measurement of body fat or overall health.
BMI formula
For metric measurements, BMI is calculated as weight in kilograms Γ· height in meters squared. For U.S. customary measurements, the formula is weight in pounds Γ· height in inches squared Γ 703.
If you would rather skip the calculation, use the free TasteWiser BMI Calculator & Nutrition Tracker.
Adult BMI categories
For adults, common BMI categories are: below 18.5 underweight, 18.5 to 24.9 healthy weight, 25.0 to 29.9 overweight, and 30.0 or higher obesity. These ranges are screening categories, not diagnoses.
What BMI can and cannot tell you
BMI can help identify weight-for-height patterns across populations and may be one useful piece of an individual health assessment. However, BMI does not distinguish fat from muscle or bone, and it does not show where body fat is stored.
The CDC recommends considering BMI alongside other information such as medical history, physical examination findings, health behaviors and laboratory results. That is why a single BMI number should not be treated as a complete picture of health.
Why athletes and muscular people may get misleading results
Because BMI uses total body weight, a muscular person may have a higher BMI even when much of that weight comes from lean mass. The same calculation also cannot describe differences in body composition between people with the same BMI.
How to use BMI responsibly
Use BMI as a starting point rather than a verdict. Track trends over time, consider waist measurement and other health indicators where appropriate, and speak with a healthcare professional if you have concerns about weight, nutrition or health risk.
Try the TasteWiser BMI tool
Our BMI Calculator & Nutrition Tracker calculates BMI and also provides general calorie and protein planning estimates. The results are educational estimates and are not medical advice.
Source: CDC: About Body Mass Index (BMI).
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