Enter your height and weight to see BMI and adult category results. Results are for health reference only and do not replace medical diagnosis.
Example: 170 cm
Example: 65 kg
Example: 5 ft 9 in
Example: 154 lb
🛡 This tool is for reference only. Consult a professional for pregnancy, athletes, children, or special medical conditions.
Balanced diet + regular exercise = healthy life
Waist circumference reference: men should be less than 90 cm
Enter centimetres, or use feet and inches.
Kilograms and pounds are converted automatically.
Choose the Taiwan adult or WHO international category.
Get your BMI, category, and healthy-weight range instantly.
BMI (Body Mass Index) uses height and weight to estimate whether weight is within a general healthy range. It is suitable for an initial adult self-check.
| Category | BMI range |
|---|---|
| Underweight | BMI < 18.5 |
| Healthy | 18.5 ≤ BMI ＜ 24 |
| Overweight | 24 ≤ BMI ＜ 27 |
| Obesity | BMI ≥ 27 |
The BMI formula and adult categories are the same for all sexes. Body-fat and muscle proportions may differ, so this tool also provides an ideal-weight and waist-size reference.
BMI is a useful initial adult screening tool, but it cannot distinguish fat from muscle and does not replace a full health assessment.
It can be. Athletes with more muscle may have a higher BMI without having high body fat. Consider body-fat percentage and waist size too.
No. Children and teenagers should use growth charts based on age and biological sex.
For most people, recording it monthly at a consistent time is enough. Follow professional advice when managing health conditions.
A common method works back from a BMI of 22. This tool also uses a height- and sex-based reference formula to show a suggested weight.
Yes. BMI is weight divided by height squared. Organisations may use different ranges to interpret the same value.
Ideal weight is often estimated with either of these two methods:
This method works back from BMI 22, the middle of the healthy range, and is useful as a long-term target for adults.
This is a reference formula expressed in kilograms. The suggested weight shown by this page changes with the selected sex.
Ideal weight is only a reference. A sustainable healthy range and overall health matter more than reaching one particular number.
Avoid drastic dieting. Start with regular activity, balanced meals, adequate sleep, and a gradual weight goal. Waist measurement can provide useful additional context.
Low weight can be associated with inadequate nutrition and other health concerns. Eat regular meals, include quality protein, and seek medical advice if weight changes noticeably without intent.
Consult a health professional for severe obesity, related health conditions, sleep-disordered breathing, or substantial unintentional weight change.
BMI may be used together with height in physical-examination standards; confirm the applicable standard with the relevant organisation.
Schools may calculate BMI as one basic physical-fitness and health-management measure.
A BMI outside the recommended range on a health report can help you set a gradual, practical weight goal.
Use BMI together with waist size and body-fat percentage to set a more useful goal than a single target weight.