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BMI Calculator - Body Mass Index
Calculate your BMI and get personalized health recommendations
BMI Formula:
BMI = weight (kg) ÷ height² (m²)
Or in imperial: weight (lbs) × 703 ÷ height² (inches²)
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Health Recommendation:
Consider increasing physical activity and focusing on portion control. Small, sustainable changes can make a significant difference.
BMI category ranges
| Category | BMI Range | What it means |
|---|---|---|
| Underweight | Below 18.5 | May indicate nutritional deficiency |
| Normal weight | 18.5 – 24.9 | Associated with lowest health risk |
| Overweight | 25.0 – 29.9 | Increased risk of some conditions |
| Obese Class I | 30.0 – 34.9 | High risk — consult a professional |
| Obese Class II | 35.0 – 39.9 | Very high risk |
| Obese Class III | 40.0 and above | Extremely high risk |
A BMI calculator is a health tool that estimates body mass index from height and weight to classify underweight, normal, overweight, or obesity in adults.
How to Calculate Body Mass Index (BMI)
- Select units (metric or imperial)
- Enter your height
- Enter your weight
- Click calculate to see BMI and category
- Use results as a screening metric—not a diagnosis
The Body Mass Index (BMI) Formula
BMI = weight (kg) / height (m)², or BMI = (weight lb / height in²) × 703
Where: symbols follow the inputs and conventions used in this calculator (principal, rates, terms, or units as labeled).
Real-World Example
Someone who is 5'10" and 180 lb has a BMI near 25.8.
Quick Reference
- How to calculate Body Mass Index (BMI)?
- Select units (metric or imperial) Enter your height Enter your weight Click calculate to see BMI and category Use results as a screening metric—not a diagnosis
- What is the formula for Body Mass Index (BMI)?
- BMI = weight (kg) / height (m)², or BMI = (weight lb / height in²) × 703
- Can you give a real-world Body Mass Index (BMI) example?
- Someone who is 5'10" and 180 lb has a BMI near 25.8.
- Is BMI accurate for athletes?
- BMI can overestimate body fat for muscular people and underestimate it for older adults who have lost muscle. Pair BMI with waist size and professional advice when relevant.
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