Building a BMI Calculator in TypeScript — Imperial and Metric Formulas, WHO Classification, and Reverse-BMI

The Formula Isn't the Hard Part BMI is simple math. The formula is: Metric: BMI = weight (kg) / height (m)² Imperial: BMI = weight (lbs) / height (in)² × 703 The tricky parts are: Imperial height input — users want feet + inches, not total inches ...