BMI Calculator

BMI (Body Mass Index) is a screening tool for weight categories. It calculates weight-to-height ratio. Formula: weight (kg) / height² (m). Categories: underweight (<18.5), normal (18.5-24.9), overweight (25-29.9), obese (30+).

BMI is a general screening tool, not a diagnostic. It doesn't distinguish muscle from fat. Athletes may have high BMI but low body fat. For most people, BMI correlates with body fat and health risks. Consult healthcare providers for complete assessment.

Normal BMI range is 18.5-24.9. This range correlates with lowest health risks. BMI 25-29.9 is overweight (increased risk). BMI 30+ is obese (high risk). Below 18.5 is underweight (may indicate malnutrition).

For imperial: BMI = (weight in pounds / (height in inches)²) × 703. Example: 150 lbs, 5'6" (66 inches): BMI = (150 / 66²) × 703 = 24.2 (normal). This calculator handles both metric and imperial automatically.

Ideal weight is the range for normal BMI (18.5-24.9) at your height. For 5'6" (168 cm), ideal is 115-154 lbs (52-70 kg). This calculator shows your personalized ideal range based on current height.

BMI formula doesn't account for age. However, older adults may have higher healthy BMI due to muscle loss. Some organizations recommend slightly higher BMI targets for seniors. Consult healthcare providers for age-appropriate guidance.

BMI doesn't measure body fat directly. It may misclassify athletes (high muscle) or elderly (low muscle). It doesn't show fat distribution (belly fat is riskier). For complete health assessment, consider waist circumference, body fat percentage, and overall fitness.