The bmi calculator is a free online tool that helps you convert between health units quickly and accurately. It supports 2 units including kg/m² (kg/m²), lb/ft² (lb/ft²). The core conversion formula is: BMI = weight (kg) / height (m)². For example, 1 kg/m² equals approximately 0.070307 lb/ft². Conversely, 1 lb/ft² equals approximately 14.223355 kg/m². Common conversions: 5 kg/m² = 0.351535 lb/ft², 10 kg/m² = 0.703069 lb/ft², 25 kg/m² = 1.757673 lb/ft², 50 kg/m² = 3.515345 lb/ft², 100 kg/m² = 7.03069 lb/ft². This converter is useful for students, engineers, scientists, and professionals who need accurate health unit conversions. Whether you are working on homework, technical specifications, research data, or everyday measurements, this tool provides instant, reliable results. All conversions are calculated relative to a single base unit for consistency and precision across all supported units. BMI categories: Underweight (<18.5), Normal (18.5-24.9), Overweight (25-29.9), Obese (≥30). BMI is a screening tool and doesn't measure body fat directly.