How the calculation works
BMI is weight in kilograms divided by height in metres squared. This calculator uses adult reference groups and keeps the numbers in this browser page.
Inputs and results are not sent to EmpowerLink or analytics.
BMI Calculator
Calculate your Body Mass Index to understand your weight category and health risks.
BMI Categories
| BMI Range | Category |
|---|---|
| < 18.5 | Underweight |
| 18.5 - 24.9 | Normal weight |
| 25 - 29.9 | Overweight |
| ≥ 30 | Obesity |
BMI = kg/m² where kg is weight in kilograms and m² is height in meters squared.
What is BMI?
Body Mass Index (BMI) is a simple calculation using a person's height and weight. BMI is a useful tool for identifying whether a person is underweight, normal weight, overweight, or obese, which can help to assess their risk for certain health conditions.
Why BMI Matters
- Heart Disease: Excess weight can increase the risk of heart disease by raising blood pressure and cholesterol levels.
- Diabetes: Being overweight is a major risk factor for type 2 diabetes.
- Cancer: Certain types of cancer are more common in people who are overweight or obese.
- Respiratory Problems: Excess weight can lead to sleep apnea and other respiratory issues.
- Joint Problems: Being overweight can strain joints, leading to conditions like osteoarthritis.
The Role of Healthy Eating
- Variety: Include fruits, vegetables, whole grains, lean proteins, and healthy fats in your diet.
- Portion Control: Be mindful of portion sizes to avoid overeating.
- Limit Unhealthy Foods: Reduce the intake of processed foods, sugary drinks, and high-fat, high-sugar snacks.
BMI Limitations
BMI is not the most reliable measure of whether your weight is in a healthy range. It doesn't take into account important factors like age, gender, and body composition (fat, muscle, and bone).
BMI may not be accurate for:
- Some ethnic groups including Aboriginal and/or Torres Strait Islander Peoples, and people of Asian/South Asian descent
- Women who are pregnant
- People 19 years of age or younger
- Athletes or people with a lot of muscle
- People with conditions affecting fluid levels (e.g., heart failure)
Need Professional Guidance?
At EmpowerLink, our team of registered nurses can provide professional recommendations tailored to your individual health needs. We can also assist with referrals to dietitians who specialise in creating personalised nutrition plans.
Maintaining a healthy BMI and eating a balanced diet are vital steps toward a healthier life. If you need support or guidance, don't hesitate to reach out.
Contact UsUse BMI with context
BMI cannot distinguish muscle from body fat or show where fat is distributed. It should not be used alone to make treatment or eating decisions.