BMI Calculator
Calculate your Body Mass Index (BMI) from height and weight. See your BMI category and what it means.
ft
in
lbs
Your BMI
25.1
Overweight
BMI range: 25.0 – 29.9
Healthy weight for this height: 129–174 lbs
BMI Scale
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BMI Categories
- Underweight
- Below 18.5
- Healthy Weight
- 18.5 – 24.9
- Overweight
- 25.0 – 29.9
- Obese (Class I)
- 30.0 – 34.9
- Obese (Class II)
- 35.0 – 39.9
- Obese (Class III)
- 40.0 and above
Disclaimer: BMI is a screening tool, not a diagnostic measure. It does not account for muscle mass, bone density, age, or sex. Consult a healthcare provider for a complete health assessment.
BMI Categories
Underweight: BMI < 18.5. Healthy weight: 18.5–24.9. Overweight: 25.0–29.9. Obese Class I: 30.0–34.9. Obese Class II: 35.0–39.9. Obese Class III: 40+.
BMI Formula
Metric: BMI = kg ÷ m². US: BMI = (lbs ÷ in²) × 703. Example: 160 lbs, 5'8" (68 in). BMI = (160 ÷ 68²) × 703 = (160 ÷ 4,624) × 703 ≈ 24.3 (Healthy).
Frequently Asked Questions
- For adults, a BMI of 18.5–24.9 is considered healthy. Under 18.5 is underweight. 25–29.9 is overweight. 30 and above is obese.
- BMI = weight (kg) ÷ height² (m²). In US units: BMI = [weight (lbs) ÷ height² (in²)] × 703.
- BMI can misclassify muscular athletes as overweight because it doesn't distinguish between muscle and fat. Athletes should consult a healthcare professional for body composition analysis.
- Yes. Children and teens use age- and sex-specific BMI percentiles rather than fixed categories. This calculator uses adult BMI categories.