BMI Calculator
Free online BMI calculator to calculate your Body Mass Index based on height and weight. Check your BMI category and get health recommendations. Perfect for health monitoring and fitness tracking.
Calculate Your BMI
BMI Categories and Health Ranges
| BMI Range | Category | Health Risk | Recommendations |
|---|---|---|---|
| < 18.5 | Underweight | Malnutrition risk | Gain weight gradually |
| 18.5 - 24.9 | Normal weight | Low risk | Maintain current weight |
| 25.0 - 29.9 | Overweight | Increased risk | Lose weight gradually |
| 30.0 - 34.9 | Obesity Class I | High risk | Significant weight loss needed |
| 35.0 - 39.9 | Obesity Class II | Very high risk | Medical supervision recommended |
| ≥ 40.0 | Obesity Class III | Extremely high risk | Immediate medical attention |
BMI Examples by Height and Weight
| Height | Underweight | Normal | Overweight | Obese |
|---|---|---|---|---|
| 5'0" (152cm) | < 97 lbs | 97-127 lbs | 128-152 lbs | 153+ lbs |
| 5'3" (160cm) | < 107 lbs | 107-140 lbs | 141-169 lbs | 170+ lbs |
| 5'6" (168cm) | < 118 lbs | 118-154 lbs | 155-185 lbs | 186+ lbs |
| 5'9" (175cm) | < 125 lbs | 125-168 lbs | 169-202 lbs | 203+ lbs |
| 6'0" (183cm) | < 136 lbs | 136-183 lbs | 184-220 lbs | 221+ lbs |
| 6'3" (191cm) | < 148 lbs | 148-199 lbs | 200-239 lbs | 240+ lbs |
BMI Health Guidelines
About BMI (Body Mass Index)
BMI is a simple calculation using a person's height and weight. The formula is BMI = kg/m² where kg is a person's weight in kilograms and m² is their height in metres squared.
BMI Categories
- Underweight: BMI less than 18.5
- Normal weight: BMI 18.5-24.9
- Overweight: BMI 25.0-29.9
- Obese: BMI 30.0 and above
BMI Calculation Formulas
- Metric: BMI = weight (kg) / height (m)²
- Imperial: BMI = (weight (lbs) × 703) / height (inches)²
Important Notes
- BMI is a screening tool and not a diagnostic tool
- It doesn't distinguish between muscle and fat mass
- Athletes may have high BMI due to muscle mass
- Consult healthcare professionals for medical advice
Frequently Asked Questions
What is BMI?
BMI (Body Mass Index) is a measure of body fat based on height and weight. It's calculated using the formula: BMI = weight (kg) / height (m)².
What is a healthy BMI range?
A healthy BMI range for adults is typically 18.5-24.9. Below 18.5 is underweight, 25-29.9 is overweight, and 30+ is obese.
How do you calculate BMI?
BMI is calculated by dividing weight in kilograms by height in meters squared (BMI = kg/m²). For imperial units: BMI = (weight in pounds × 703) / (height in inches)².
Is BMI accurate for everyone?
BMI is a screening tool but has limitations. It doesn't account for muscle mass, bone density, or fat distribution. Athletes or very muscular people may have high BMIs despite being healthy.