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Formula & How BMI (Body Mass Index) Calculator Works

Mathematical Formula

BMI = Weight (kg) / [Height (m)]²

Body Mass Index divides your weight in kilograms by your height in metres squared. For a person who weighs 70 kg and is 1.75 m tall, BMI = 70 ÷ (1.75 × 1.75) = 70 ÷ 3.0625 = 22.9. The World Health Organization adult ranges are under 18.5 underweight, 18.5 to 24.9 healthy weight, 25 to 29.9 overweight and 30 or above obese. BMI is a screening number, not a diagnosis: it does not separate muscle from fat, so very muscular people can read high, and it does not account for age, sex or where fat is carried. Use it alongside waist measurement and advice from your doctor.

How to Calculate BMI (Body Mass Index) Calculator (Step-by-Step)

Enter Measurement System: Input your target parameter value.
Enter Height (cm): Input your target parameter value.
Enter Weight (kg): Input your target parameter value.
Enter Height (Inches - Imperial): Input your target parameter value.
Enter Weight (Pounds - Imperial): Input your target parameter value.
Apply Formula: Calculate using BMI = Weight (kg) / [Height (m)]².
Review Results: View exact computed answers, metrics, and worked mathematical proofs.

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Frequently Asked Questions (FAQs)

What is a healthy BMI range?

A BMI between 18.5 and 24.9 is considered normal/healthy for adults.

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Official Regulatory & Government Data Sources

Authoritative Standards & Verified Reference Citations

Independent & Verified

Calculations and mathematical logic on this page are grounded in published statutory rules, regulatory standards, and official government data published by the following bodies:

Department of Health and Aged CareGovernment

Australian Government Health Agency

Australia's Physical Activity and Sedentary Behaviour Guidelines and dietary energy expenditure metrics.

www.health.gov.au

National Health and Medical Research Council (NHMRC)Government

Australian Government Medical Research Body

Nutrient Reference Values (NRVs) for Australia and New Zealand, macronutrient distribution, and hydration standards.

www.nhmrc.gov.au

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