BMI Calculator
Calculate your Body Mass Index instantly. See your health category, healthy weight range, BMI scale position, and personalized health tips based on your result.
Calculate your Body Mass Index (BMI) instantly and find your health category (underweight, normal, overweight, or obese). Enter height, weight, age, and gender to see your BMI score and corresponding health assessment. BMI is a screening tool for body composition, calculated as weight (kg) divided by height in meters squared. While BMI has limitations (doesn't distinguish muscle from fat), it remains the standard initial health assessment tool used by doctors and public health agencies. Understanding your BMI helps guide fitness and nutrition decisions by BMI calculator.
BMI Categories: Underweight, Normal, Overweight, Obese
Underweight: BMI <18.5. Associated with malnutrition, a weak immune system, and hormonal issues. Medical concern. Normal Weight: BMI 18.5-24.9. Lowest health risk. Target range. Overweight: BMI 25-29.9. Increased risk of type 2 diabetes, heart disease, and high blood pressure. Warrants lifestyle changes. Obese: BMI 30+. Significantly increased disease risk. Diabetes risk 80+ times higher than normal. Heart disease risk 2-3x higher. Each BMI point increase = 7% increased mortality. BMI 25 vs BMI 35 = 70% higher mortality risk. For every 2.2 lbs weight loss, health markers improve measurably. Calculate with our free online BMI calculator.
Healthy Weight Range by Height
BMI 18.5-24.9 is healthy. For 5'9": 125-165 lbs. For 5'5": 110-150 lbs. For 6'1": 140-187 lbs. For 5'1": 97-130 lbs. The exact target within range depends on body composition, bone density, and personal factors. Two people of the same height/weight can be completely different: Person A: 70kg, 15% body fat = fit, athletic. Person B: 70kg, 35% body fat = appears heavier (muscle is denser than fat). Use BMI as a screening tool, not an exact target.
BMI Categories Explained
- Underweight: BMI < 18.5
- Normal Weight: BMI 18.5-24.9
- Overweight: BMI 25-29.9
- Obese Class 1: BMI 30-34.9
- Obese Class 2: BMI 35-39.9
- Obese Class 3: BMI 40+
How to Improve Your BMI
- Eat protein-rich foods
- Include vegetables in every meal
- Reduce processed foods
- Exercise 150 minutes/week
- Get quality sleep (7-9 hours)
- Stay hydrated
- Consider working with a nutritionist
Frequently Asked Questions About BMI & Health
Q: Is BMI accurate for everyone?
A: BMI is a screening tool, not diagnostic. Issues: Doesn't account for muscle (muscular people can have high BMI but low fat). Ignores bone density and age differences. Use with waist circumference and a doctor's evaluation.
Q: What's my healthy weight range?
A: BMI 18.5-24.9 is healthy for adults. For 5'9": 125-165 lbs. For 5'5": 110-150 lbs. The exact target depends on body composition and personal factors. Use BMI as a baseline only.
Q: Should I worry if my BMI is 25-29.9?
A: Overweight (25-29.9) increases health risk, but context matters. Very muscular people may have a high BMI with low body fat. Good health habits matter more than BMI alone. Talk to a doctor about your risk factors.
Q: How can I lose weight healthily?
A: Calorie deficit 500/day = 0.5 lb loss/week (safe). Combine a balanced diet, exercise (150 min cardio + strength 2x/week), and sleep 7-9 hours. Don't lose more than 2 lbs/week. Use the calorie calculator for targets.