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BMI Calculator Advanced

Calculate Body Mass Index and Weight Status

Units

Weight (kg)

Height (cm)

BMI Formula

Metric: BMI = kg / m²

Imperial: BMI = (lb / in²) × 703

1 m = 100 cm, 1 ft = 12 in

BMI is a simple screening tool for weight-related health risks.

⚠ BMI is a screening tool, not a diagnostic. Consult healthcare professionals for personalized advice.

What Is BMI?

BMI (Body Mass Index) is a simple calculation using height and weight to estimate body fat and categorize weight status. It's widely used in public health and clinical settings.

Underweight

BMI < 18.5. May indicate nutritional deficiency or other health issues.

Normal Weight

BMI 18.5-24.9. Associated with lowest health risk for most adults.

Overweight

BMI 25-29.9. Increased risk of hypertension, diabetes, and heart disease.

Obesity

BMI ≥30. Significantly elevated health risks requiring medical attention.

Teaching Example: 70kg, 175cm. Height = 1.75m. BMI = 70 / (1.75²) = 70 / 3.0625 = 22.86 (Normal).

Applications

Health Screening Weight Management Fitness Tracking Public Health Clinical Assessment

Frequently Asked Questions

What is BMI?▼

BMI (Body Mass Index) is weight(kg)/height(m)^2. It estimates body fat and health risks for most adults.

BMI categories?▼

Underweight <18.5, Normal 18.5-24.9, Overweight 25-29.9, Obesity I 30-34.9, Obesity II 35-39.9, Obesity III ≥40.

Metric vs imperial?▼

Metric: kg/m². Imperial: (lb/in²)×703. Both produce the same BMI value.

BMI limitations?▼

BMI doesn't distinguish muscle vs fat. Athletes may have high BMI but low body fat.

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