BMI Calculator
Calculate your Body Mass Index (BMI) and find your ideal weight range.
How to Use This Calculator
- Select your measurement system (Imperial or Metric)
- Enter your height (feet/inches or centimeters)
- Enter your weight (pounds or kilograms)
- Optionally enter your age and gender for more accurate insights
- Click Calculate to see your BMI and health category
- Share or bookmark your results - the URL automatically saves your inputs!
Measurement System
Your Measurements
Additional Information (Optional)
💡 Understanding BMI
Body Mass Index (BMI) is a measure of body fat based on height and weight. While BMI is a useful screening tool, it doesn't directly measure body fat and may not be accurate for athletes, pregnant women, or elderly individuals.
⚕️ BMI Categories
- Underweight: BMI less than 18.5
- Normal weight: BMI 18.5 to 24.9
- Overweight: BMI 25 to 29.9
- Obese: BMI 30 or greater
📊 BMI Limitations
BMI doesn't distinguish between muscle and fat mass. Athletes with high muscle mass may have a high BMI but low body fat. For a complete health assessment, consult with a healthcare professional who can consider additional factors like body composition, lifestyle, and family history.
🔗 Save & Share Your Calculation
Your inputs are automatically saved in the URL. You can bookmark this page to save your calculation, or use the Share button to send it to others. When you return or share the link, all values will be restored automatically.
Frequently Asked Questions
What is a healthy BMI for adults?
A healthy BMI is between 18.5 and 24.9. Below 18.5 is underweight, 25-29.9 is overweight, and 30+ is obese. However, BMI doesn't account for muscle mass, bone density, age, or fat distribution — a muscular athlete may have a 'high' BMI but excellent health.
Is BMI accurate for athletes and muscular people?
No, BMI is less accurate for athletes, bodybuilders, and very muscular individuals. Muscle weighs more than fat, so muscular people often have 'overweight' BMIs despite low body fat. For these individuals, body fat percentage, waist circumference, or DEXA scans provide better health assessments.
How do I lower my BMI safely?
To lower BMI safely, aim for 1-2 pounds of weight loss per week through a moderate calorie deficit (500-750 calories/day below maintenance) combined with regular exercise. Focus on whole foods, lean protein, and strength training to preserve muscle. Consult a healthcare provider before starting any weight loss plan.