Free BMI & Weight Calculator
Calculate your Body Mass Index (BMI) instantly using our comprehensive body weight index calculator. Get accurate body fat index results with weight in pounds and height in feet and inches.
Calculate Your BMI
Enter your weight and height to get instant results
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BMI Categories
How It Works
Our BMI calculator uses the standard formula recommended by health organizations worldwide
Enter Your Weight
Input your weight in pounds (lbs). Our calculator accepts decimal values for precise measurements.
Enter Your Height
Input your height in feet and inches. This is the most common measurement system in the US.
Get Instant Results
Receive your BMI score immediately with category classification and health insights.
What You'll Get
More than just a number - get comprehensive insights about your health status
Accurate BMI Score
Precise calculation using the standard BMI formula (weight ÷ height²) × 703
Health Category
Clear classification: Underweight, Normal, Overweight, or Obese
Health Insights
Personalized recommendations based on your BMI category
Visual Chart
Interactive BMI chart showing all categories and your position
Frequently Asked Questions
Common questions about BMI and our calculator
What is BMI?
BMI (Body Mass Index) is a widely used screening tool that measures body fat based on height and weight. It's calculated by dividing your weight in kilograms by your height in meters squared, or using the formula (weight in pounds ÷ height in inches²) × 703 for US units.
Is BMI accurate for everyone?
BMI is a useful screening tool but has limitations. It doesn't distinguish between muscle and fat mass, so athletes or very muscular individuals may have high BMIs without excess fat. It's also less accurate for older adults, pregnant women, and certain ethnic groups. Always consult healthcare professionals for comprehensive health assessments.
What are the BMI categories?
The standard BMI categories are: Underweight (below 18.5), Normal weight (18.5-24.9), Overweight (25.0-29.9), and Obese (30.0 and above). These ranges are based on research linking BMI to health risks, though individual health factors vary.
How often should I check my BMI?
For most adults, checking BMI every few months is sufficient unless you're actively trying to lose or gain weight. Regular monitoring can help track long-term trends, but daily fluctuations are normal due to factors like hydration, food intake, and time of day.
Should I be concerned about my BMI results?
BMI is just one health indicator. If your BMI falls outside the normal range, consider consulting with a healthcare provider who can assess your overall health, including factors like muscle mass, bone density, family history, and lifestyle habits. They can provide personalized recommendations for your situation.
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Discover comprehensive health guides and compare your BMI with national averages