BMI Calculator - Calculate Your BMI
Body mass index (BMI) is a measure of body fat based on height and weight that applies to adult men and women. Your BMI is just one piece of the puzzle. It’s based on height and weight but doesn’t take into account your muscle mass, bone density, or body composition.
Adult BMI Calculator
This calculator provides BMI and the corresponding BMI category for adults 20 and older.
This is the World Health Organization’s (WHO) recommended body weight based on BMI values for adults. It is used for both men and women, age 20 or older.
| Classification | BMI range – kg/m2 |
|---|---|
| Severe Thinness | < 16 |
| Moderate Thinness | 16 – 17 |
| Mild Thinness | 17 – 18.5 |
| Normal | 18.5 – 25 |
| Overweight | 25 – 30 |
| Obese Class I | 30 – 35 |
| Obese Class II | 35 – 40 |
| Obese Class III | > 40 |
BMI chart for adults
Limitations of measuring body mass index
It’s important to remember that BMI is not the most reliable measure of whether your weight is in a healthy range for your height. It’s not a good overall indicator of how healthy you are, and doesn’t take into account important factors like age, gender and body composition (fat, muscle and bone).
For the following groups of people, BMI is not an accurate measure:
- 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 who have a lot of muscle.
- People with a condition that affects the amount of fluid in their body (for example, heart failure)
Why Monitoring BMI Matters
Regularly tracking your BMI provides insight into potential health risks such as:
Heart disease
Type 2 diabetes
Joint problems
Hormonal imbalances
Tip: Combine BMI tracking with body fat percentage and waist-to-hip ratio for a complete health overview.
Recommended Tools and Resources
To take your health management to the next level, consider these high-quality resources:
Smart Scales & Fitness Trackers – Measure weight, body fat, and BMI accurately at home.
Meal Planning Apps – Customized nutrition plans to achieve your ideal BMI.
Online Coaching Programs – Access certified dietitians and trainers from your home.
How to Achieve a Healthy BMI
Balanced Diet – Prioritize whole foods, lean proteins, and healthy fats.
Regular Exercise – Mix cardio, strength training, and flexibility exercises.
Track Progress – Use apps or journals to monitor BMI, weight, and lifestyle changes.
Professional Support – Consult nutritionists, dietitians, or personal trainers when necessary.
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