BMI Calculator (Adult)
BMI Calculator (Adult)
Compute adult BMI and see your healthy weight range.
What is BMI?
Body Mass Index (BMI) relates weight and height to quickly estimate nutritional status. It’s useful for screening, but it’s **not a diagnosis**: body composition, age, sex, ethnicity and specific conditions (e.g., athletes, pregnancy, older adults) can change interpretation.
Formula
The formula is BMI = weight (kg) / height (m)². If you enter pounds and feet/inches, the calculator converts to metric before applying the formula.
Variables
- Weight (
W) — kg, lb · 1 lb = 0.45359237 kg - Height (
H) — m, cm, ft/in · 1 in = 2.54 cm · 1 ft = 30.48 cm
Examples
- 1. 70 kg and 175 cm → BMI ≈ 22.9 (normal).
Adult Reference Ranges
Adult BMI categories are based on WHO standards.
| BMI | Category |
|---|---|
| < 18.5 | Underweight |
| 18.5 – 24.9 | Normal |
| 25 – 29.9 | Overweight |
| 30 – 34.9 | Obesity I |
| 35 – 39.9 | Obesity II |
| ≥ 40 | Obesity III |
Limitations
While BMI is a useful screening tool, it has limitations. Consider these points:
- BMI is a screening tool and does not directly measure body fat.
- It may misclassify muscular individuals as overweight or obese.
- Does not account for fat distribution, which affects health risk.
- Not suitable for all populations (e.g., athletes, pregnant )
Important Notes
- This tool is informational and not a medical diagnosis.
- For specific medical conditions, consult a healthcare professional.