Features of this BMI Calculator:

1. Three Unit Systems:

• US Units: Height in feet/inches, weight in pounds
• Metric Units: Height in centimeters, weight in kilograms
• Other Units: Height in meters, weight in kilograms

1. Comprehensive Inputs:

• Age (2-120 years range)
• Gender selection (with visual icons)
• Unit-appropriate height and weight inputs

1. Visual Results:

• Clear BMI value display
• Weight category classification
• Color-coded BMI scale with indicator
• Visual feedback for underweight, normal, overweight, and obese categories

1. User Experience:

• Modern gradient design with smooth animations
• Responsive layout that works on mobile devices
• Input validation and error handling
• Intuitive tab-based interface
• Gender selection with visual feedback

1. Technical Implementation:

• Proper BMI calculation formulas for each unit system
• Real-time indicator positioning on the BMI scale
• Input range validation to prevent invalid entries
• Smooth transitions between tabs and results