Body Mass Index (BMI) Screening Calculator

Free, confidential health screening tool for adults based on World Health Organization guidelines.

Calculate Your Adult BMI

Height in Centimetres (cm) *

Enter height between 60 cm and 260 cm.

Weight in Kilograms (kg) *

Enter weight between 20 kg and 350 kg.

Adult BMI Classification Reference

Classification	Global WHO Standard	Asian / Indian Criteria *
Underweight	< 18.5 kg/m²	< 18.5 kg/m²
Normal Weight	18.5 – 24.9 kg/m²	18.5 – 22.9 kg/m²
Overweight	25.0 – 29.9 kg/m²	23.0 – 24.9 kg/m²
Obesity	≥ 30.0 kg/m²	≥ 25.0 kg/m²

* The World Health Organization (WHO) and Indian Health Ministry recommend lower cutoffs for South Asian adults because body fat percentage and diabetes risks are higher at lower BMI levels.

Important Screening Notice

BMI is a preliminary screening measure, not a diagnostic examination. It calculates the relationship between weight and height without directly measuring body fat, bone density, or muscle distribution.

Not Suitable for Children: Adult BMI categories cannot be used for children or adolescents under age 18. Pediatric growth interpretation requires age-and-gender percentiles plotted on clinical pediatric growth charts.

No Automatic Treatment Decisions

Clinical treatment or weight management decisions should never be based solely on a numerical BMI score. Consult a qualified physician, endocrinologist, or clinical dietitian for a comprehensive health evaluation, including blood pressure, lipid profile, and glycemic control.

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100% Private Tool

We respect your privacy. This calculation runs locally in your browser. MyHealthBook does not save your entered height, weight, or calculated results, and does not transmit them to analytics servers.