BMI & Health Calculator
Calculate your Body Mass Index and get personalized health insights
BMI Classification Chart
Underweight< 18.5
Normal Weight18.5 - 24.9
Overweight25 - 29.9
Obese≥ 30
Calculate Your BMI
Enter your weight and height to get started
Pro Tips
- • Switch between metric and imperial units with one click
- • Your calculation history is automatically saved in your browser
- • Export your results as JSON for health tracking apps
- • BMI is most accurate for adults; consult healthcare providers for children and athletes
How to Use BMI Calculator
1
Choose your unit system: Toggle between Metric (kg/cm) or Imperial (lbs/feet-inches) using the unit button at the top.
2
Enter your measurements: Input your weight and height accurately. For Imperial units, enter feet and inches separately.
3
Calculate and view results: Click "Calculate BMI" to see your BMI score, category, and position on the visual BMI chart.
4
Review health recommendations: Read the personalized health tips and ideal weight range based on your BMI category.
5
Track your progress: Your calculation history is automatically saved. Export results as JSON to track changes over time.
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Help others discover this free tool
Frequently Asked Questions
BMI (Body Mass Index) is a measure of body fat based on height and weight. For metric units, BMI = weight(kg) / height(m)². For imperial units, BMI = (weight(lbs) / height(in)²) × 703. It provides a quick screening tool to categorize weight status.
BMI is a useful screening tool but has limitations. It doesn't account for muscle mass, bone density, age, sex, or body composition. Athletes with high muscle mass may have high BMI but low body fat. Always consult healthcare professionals for comprehensive health assessment.
BMI categories are: Underweight (<18.5), Normal Weight (18.5-24.9), Overweight (25-29.9), and Obese (≥30). These ranges correlate with health risks, but individual health depends on many factors beyond BMI alone.
This calculator is designed for adults (18+ years). Children and teenagers require BMI-for-age percentile charts that account for age and sex-specific growth patterns. Consult a pediatrician for accurate BMI assessment for minors.
BMI has limited accuracy for athletes and bodybuilders because it doesn't distinguish between muscle and fat. Someone with high muscle mass may be classified as overweight or obese despite having low body fat. Consider body composition analysis for more accurate assessment.
The calculator shows your ideal weight range based on a BMI of 18.5-24.9 for your height. This range represents the weight associated with lowest health risks for most adults, though individual healthy weights may vary based on body composition and other factors.
BMI outside the normal range may indicate increased health risks, but it's not a definitive diagnosis. Factors like muscle mass, age, genetics, and overall health matter. If concerned, consult a healthcare provider for comprehensive evaluation and personalized advice.
BMI and body fat percentage are related but different. BMI is calculated from height and weight, while body fat percentage measures actual fat tissue. Two people with the same BMI can have very different body fat percentages depending on muscle mass and composition.
Yes! This calculator automatically saves your last 10 calculations in your browser. You can also export results as JSON files to track changes over time. Regular monitoring helps you see trends and progress toward health goals.
To change BMI safely: 1) Consult healthcare providers for personalized plans, 2) Focus on balanced nutrition with appropriate calorie intake, 3) Include regular physical activity, 4) Set realistic goals (1-2 lbs/week for weight loss), and 5) Make sustainable lifestyle changes, not quick fixes.
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