BMI Calculator - Body Mass Index
Calculate your BMI instantly with our free BMI calculator. Find out your body mass index and health category. Supports metric and imperial units.
Enter Your Details
⚠️ Medical Disclaimer:
BMI is a screening tool and does not directly measure body fat. It may not accurately reflect health for athletes, elderly, or pregnant women. Always consult healthcare professionals for medical advice.
How to Use
Follow these simple steps for quick results
- 1Select your preferred unit system (Metric or Imperial)
- 2Enter your weight (kg or lbs)
- 3Enter your height (cm or ft/in)
- 4Your BMI is calculated automatically
- 5View your BMI category and health recommendations
Key Features
⚖️ Accurate BMI calculation
📏 Metric and Imperial units
📊 BMI category classification
💡 Health recommendations
⚡ Real-time calculation
🎯 Ideal weight range
📱 Mobile-friendly
🆓 Free and unlimited use
Frequently Asked Questions
What is BMI?
BMI (Body Mass Index) is a measure that uses your height and weight to estimate body fat. It is calculated by dividing weight in kilograms by height in meters squared (kg/m²). BMI is used as a screening tool to identify potential weight problems.
How is BMI calculated?
BMI = weight (kg) / [height (m)]². For example, if you weigh 70 kg and are 1.75 m tall, your BMI would be 70 / (1.75 × 1.75) = 22.86. You can also use pounds and inches: BMI = (weight in pounds × 703) / [height in inches]².
What is a healthy BMI range?
For adults: Underweight (< 18.5), Normal weight (18.5-24.9), Overweight (25-29.9), Obese (30+). These ranges apply to most adults aged 20 and over, though individual health factors should also be considered.
Is BMI accurate?
BMI is a useful screening tool but has limitations. It does not directly measure body fat or distinguish between muscle and fat mass. Athletes with high muscle mass may have high BMI but low body fat. Consult healthcare professionals for a complete health assessment.
Does BMI apply to children and teenagers?
For children and teens (ages 2-19), BMI is calculated the same way but interpreted differently using age and sex-specific growth charts. Pediatric BMI percentiles account for normal growth patterns. Always consult a pediatrician for children.
What should I do if my BMI is high?
A high BMI may indicate increased health risks. Consult a healthcare provider for personalized advice. They can assess other factors like diet, exercise, family history, and overall health to recommend appropriate steps for weight management.