WHO Standard Formula · Real-Time · Free
Enter total height as feet + remaining inches (e.g. 5 ft 9 in)
Optional · Unlocks Waist Circumference Risk
Measure at navel level, relaxed. Required for abdominal risk assessment.
Optional · Unlocks Body Fat Estimate
BMI Prime
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Ratio to normal upper limit (1.0 = threshold)
Ponderal Index
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kg/m³ · alt. body mass metric
Waist Circumference Risk
NIH / Mayo Clinic thresholds—
Abdominal fat raises risk of heart disease, T2 diabetes & metabolic syndrome independently of BMI.
Body Fat % Estimate
Deurenberg formula—
Estimate based on BMI, age & sex · Not a substitute for DEXA testing
BMI is a population-level screening tool, not a clinical diagnosis. Muscle mass, bone density, and distribution of body fat are not captured by BMI. Consult a qualified healthcare provider for personalised medical advice.
Source: CDC — Centers for Disease Control and Prevention
Source: CDC — Centers for Disease Control and Prevention
Risk data reflects general population averages. Individual risk varies by genetics, lifestyle, and medical history. Always consult a qualified healthcare provider.
Tools to help you get to — or stay in — a healthy range.
According to the WHO, a healthy BMI is between 18.5 and 24.9. Below 18.5 is underweight, 25-29.9 is overweight, and 30 or above is considered obese.
BMI is calculated by dividing your weight in kilograms by your height in meters squared (kg/m²). In imperial units: BMI = (weight in lbs × 703) ÷ (height in inches²).
BMI is a useful screening tool but has limitations. It does not account for muscle mass, bone density, or fat distribution. Athletes may have a high BMI despite being very fit. Always consult a healthcare provider for a complete health assessment.
Our BMI calculator automatically shows your healthy weight range based on your height. A healthy BMI of 18.5-24.9 corresponds to different weight ranges depending on your height.
The standard BMI scale applies to adults 20 and older. For children and teens, age- and gender-specific BMI percentile charts are used. Our calculator uses the standard adult WHO scale.