BMI Prime Calculator
BMI Prime is the ratio of a person's BMI to the upper limit of normal BMI (25 kg/m²). It expresses how overweight or underweight a person is relative to the healthy upper threshold. A BMI Prime of 1.00 means BMI = 25. Below 1.00 is underweight or normal; above 1.00 is overweight or obese.
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Tip: BMI Prime makes cross-population comparisons easier. For populations where BMI cut-offs differ (e.g. Asian populations where 23 is considered overweight), BMI Prime can be recalculated against a different denominator.
- 1BMI Prime = BMI / 25
- 2BMI Prime < 0.74: Underweight
- 3BMI Prime 0.74–1.00: Normal weight
- 4BMI Prime 1.00–1.20: Overweight
- 5BMI Prime > 1.20: Obese
BMI 22=BMI Prime = 0.88 (normal weight)
BMI 30=BMI Prime = 1.20 (obese threshold)
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