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Calculate Body Mass Index with health range indicators and weight category classification
BMI = weight (kg) / height² (m). It's a simple screening tool for body fat categories, though it doesn't account for muscle mass, bone density, or body composition.
Track weight changes over time, set fitness goals, and use BMI as a screening tool for health assessment.
Answers about BMI accuracy for athletes, healthy ranges, age considerations, and limitations.
Is BMI accurate for everyone?
BMI has limitations. It may overestimate body fat in athletes with high muscle mass and underestimate it in older adults with reduced muscle mass. For more accurate body composition assessment, consider body fat percentage or waist circumference measurements.
What is a healthy BMI range?
A healthy BMI is typically between 18.5 and 24.9. Below 18.5 is underweight, 25-29.9 is overweight, and 30+ is obese. However, individual health factors should be considered - consult a healthcare provider for personalized assessment.
Can BMI be used for children?
BMI for children and teens (2-19 years) uses age- and sex-specific percentiles called BMI-for-age. The standard adult BMI categories don't apply to growing children. This calculator is designed for adults (18+ years).
How often should I check my BMI?
Check BMI periodically when monitoring weight changes or fitness progress. Weekly or monthly checks are reasonable for weight management programs. Remember that BMI is just one health indicator - it should be considered alongside other health metrics.
Recommendations for interpreting BMI in context with other health metrics and consulting healthcare professionals.
BMI formula examples for metric and imperial measurements.
Formula: BMI = weight(kg) / height(m)²
Example: 70kg / (1.75m)² = 22.9 (Normal)
Imperial: BMI = 703 × weight(lb) / height(in)²
Calculation method, supported units, and applicability.