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🇦🇺 Health Calculator

BMI Calculator

Calculate your Body Mass Index and find your healthy weight range instantly.

Your Details
♂Male
♀Female
25 yrs
170 cm
cm
70 kg
kg
Your BMI
0.0
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BMI Scale
UnderweightNormalOverweightObese
Healthy Range
–
Ideal Weight
–
To Gain/Lose
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Category
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💚 Health Insights

About This BMI Calculator Australia

This free BMI (Body Mass Index) calculator estimates your BMI and healthy weight range based on your height and weight. It is designed for Australian adults.

BMI is a widely used screening tool to assess whether an adult is at a healthy weight for their height. While it has limitations, it provides a useful starting point for understanding your weight status. This is general information only, not medical advice — BMI does not account for muscle mass, age or body composition, so talk to your GP about what a healthy weight means for you.

Understanding Your BMI Result

BMI ranges: Under 18.5 = Underweight. 18.5-24.9 = Healthy weight. 25-29.9 = Overweight. 30 and above = Obese. These are population-level guidelines. Your doctor can give you personalised advice based on your full health picture.

Frequently Asked Questions

Is BMI an accurate measure of health?+
BMI is a useful screening tool but has limitations. It does not account for muscle mass, bone density, age, sex or ethnicity. Athletes may have high BMIs despite being very healthy.
What is a healthy BMI for Australians?+
A healthy BMI is generally considered 18.5 to 24.9. However, some research suggests optimal BMI may vary by age and ethnicity.
Can BMI predict health outcomes?+
At population level, BMI is associated with health risks. At the individual level, other factors like fitness, diet, blood pressure and cholesterol are more reliable health indicators.
Is BMI different for children?+
Yes — for children and teenagers, BMI is interpreted using age and sex-specific charts rather than the standard adult ranges.
Should I see a doctor about my BMI?+
If your BMI is outside the healthy range, speaking with your GP is a good step. They can provide personalised advice based on your full health profile.

Related Tools

→ Calorie Calculator→ Body Fat Calculator

RELATED GUIDE

What Your BMI Really Tells You

A plain-English guide to Body Mass Index: how BMI is calculated, what the categories mean, why the number has real limits, and how to use it sensibly.

Read the full guide →