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THE VATSALYAM • HEALTH TOOLS
BMI Calculator Calculate adult BMI, understand screening categories and review guideline-based wellness suggestions.
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ⓘ BMI is a screening measure, not a diagnosis. This calculator uses adult categories for people aged 20 or older. Current pregnancy weight and under-20 measurements must not be classified using these adult cutoffs.
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Standard reference ranges BMI is kg ÷ metres squared; the classification uses the unrounded result.
Underweight < 18.5
Healthy weight reference 18.5–24.9
Overweight 25–29.9
Obesity class 1 30–34.9
Obesity class 2 35–39.9
Obesity class 3 ≥ 40
South Asian BMI interpretation NICE recognizes greater cardiometabolic risk at lower BMI in South Asian and several other groups. For South Asian adults, 23 is the overweight/increased-risk threshold and 27.5 is the obesity threshold. This interpretation is separate from standard international categories.
Healthy lifestyle guidance Include vegetables, pulses, fruit, whole grains, and adequate protein in regular balanced meals. Choose enjoyable, sustainable physical activity within your medical and physical limits. Discuss blood pressure, blood glucose, waist size, sleep, medication and health history with a clinician. Avoid crash diets or unsupervised supplements; ask for help if weight changes unexpectedly. Important in pregnancy Pregnancy weight-gain advice is based on pre-pregnancy BMI and individual clinical circumstances. Do not use a current-pregnancy BMI to prescribe weight loss.
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