All formulas used by Calvor
The Formulas
Four equations. Each with a different history, different assumptions, and different ideal use cases.
Mifflin-St Jeor
The modern gold standard
Developed by MD Mifflin and ST St Jeor, this equation was derived from a study of 498 healthy adults. It consistently outperforms older equations in predicting resting metabolic rate and is the formula most recommended by dietitians today.
(10 × kg) + (6.25 × cm) − (5 × age) + 5(10 × kg) + (6.25 × cm) − (5 × age) − 161kgBody weight in kilogramscmHeight in centimetresageAge in years- +Validated across large, diverse populations
- +No body fat % measurement required
- +Most accurate for average body compositions
- −Less accurate at extremes of body fat
- −Does not account for lean mass directly
REFERENCE_GUIDE
Possible nutrient deficiency or underlying health issues.
Ideal balance of weight relative to height. Lower risk of disease.
Increased risk for cardiovascular stress and metabolic issues.
Significant risk for type 2 diabetes, hypertension, and heart disease.
THE FORMULA
BMI is calculated as kg/m2. It provides a simple numeric measure of a person's thickness or thinness, allowing health professionals to discuss weight problems more objectively with their patients.
LIMITATIONS
While useful for populations, it does not account for age, sex, bone structure, or fat distribution (visceral vs. subcutaneous), which are all critical markers of metabolic health.
BMI is a generalized screening tool and does not directly measure body fat percentage. For individuals with high muscle density(athletes, bodybuilders), the scale often fails. Because muscle is roughly 18% denser than fat, highly fit individuals may be categorized as "Overweight" or "Obese" despite having athletic levels of body fat.