Enter your details
Use adult measurements. Results appear above this form after submission.
Formula used
1) Body Mass Index:
BMI = weight (kg) ÷ height² (m²)
2) Waist-to-Height Ratio:
WHtR = waist (cm) ÷ height (cm)
3) Estimated Body Fat:
Male = 1.20 × BMI + 0.23 × age − 16.2
Female = 1.20 × BMI + 0.23 × age − 5.4
4) Resting Calories:
Mifflin-St Jeor equation is used for BMR, then multiplied by your activity factor.
5) Risk score:
Weighted points from BMI, waist ratio, age, activity, calories, sleep, sugary drinks, screen time, and family history are normalized to a 0–100 scale.
How to use this calculator
- Enter your age, sex used for formulas, height, weight, and waist size.
- Choose your usual activity level as honestly as possible.
- Add your average daily calories, sleep duration, sugary drinks, and screen time.
- Indicate whether close family members have obesity history.
- Press the calculate button to see your score above the form.
- Use the interpretation, chart, and downloads to review your result.
Example data table
| Profile | Age | Height | Weight | Waist | Activity | Calories | Sleep | Drinks/Week | Screen Time | Family History |
|---|---|---|---|---|---|---|---|---|---|---|
| Profile A | 29 | 168 cm | 64 kg | 74 cm | Active | 2100 | 7.5 h | 1 | 3 h | No |
| Profile B | 41 | 172 cm | 86 kg | 98 cm | Lightly active | 2550 | 6.2 h | 5 | 7 h | Yes |
| Profile C | 54 | 165 cm | 102 kg | 116 cm | Sedentary | 2900 | 5.5 h | 9 | 9 h | Yes |
Frequently asked questions
1) What does this calculator measure?
It estimates an adult obesity risk screening score using body size, waist ratio, lifestyle habits, and family history. It is designed for education and self-review, not diagnosis.
2) Is BMI alone enough?
No. BMI helps, but waist size, sleep, activity, calorie intake, and family history add important context. That is why this tool combines several inputs.
3) Why is waist-to-height ratio included?
Waist-to-height ratio helps reflect central fat distribution. Higher abdominal fat is often linked with greater cardiometabolic risk than weight alone.
4) Can this calculator diagnose obesity?
No. Only a qualified clinician can assess full health status. This page is a screening and planning tool, not a medical diagnosis.
5) Who should use it?
It is intended for adults. Children, teenagers, pregnant people, and athletes with unusual body composition may need different methods and professional guidance.
6) What does a high score mean?
A higher score means the entered measurements and habits align with stronger obesity risk signals. It suggests that lifestyle review or medical follow-up may be helpful.
7) How often should I check my result?
Monthly or every few months is enough for most people. Recheck after meaningful weight, waist, activity, sleep, or nutrition changes.
8) Can I use this with a diet plan?
Yes. The result can help you compare current calories with estimated maintenance needs, then track waist, weight, and score changes over time.