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Body Mass Index (BMI) is a numerical measure calculated from a person's height and weight used to estimate body fatness and screen for weight-related health risks in adults. Calculate BMI below:
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Heidi Evidence draws on sources clinicians already trust, from Elsevier and DynaMed to MIMS Australia, and your organization can layer in its own regional pathways, policies, and formularies.
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Evidence draws on the patient visit and its context, so the specifics travel with the question instead of being left behind. When a calculation is involved, the logic sits alongside the result, so you can see how it was reached and confirm it yourself rather than trust a black box.
Making that connection between the patient and the GP, like a puzzle fitting together.
Deborah Hawthorne
Clinicians at Connect2Care
Medical knowledge only. Not for autonomous decision making. Check sources and use your clinical judgement.
BMI calculators take weight and height as inputs and return a value in kg/m², which it maps against WHO adult categories. These classifications include underweight for a BMI below 18.5, normal weight from 18.5 to 24.9, overweight from 25.0 to 29.9, and obesity at 30.0 or above. Obesity is subdivided into Class I (30 to 34.9), Class II (35 to 39.9), and Class III (40 or above).
What the number is not is a measure of body composition. WHO describes BMI as a surrogate marker of fatness and recommends waist circumference as a supplement.
The CDC makes the same point operationally: BMI screens, it does not diagnose, and the result should be discussed in the context of the patient's overall health. Population-level correlation between BMI and total body fat sits at roughly r = 0.80, which supports screening use while leaving real room for misclassification in any individual patient.