What This BMI Calculator Does

Feature	Description
BMI Calculation	Standard formula: weight(kg) / height(m)²
Metric & Imperial	Toggle between kg/cm and lbs/inches
Age Input	Optional age field
Sliders	Interactive sliders for weight and height
BMI Scale	Visual indicator on the BMI spectrum
Category Display	Underweight, Normal, Overweight, Obese
Color-Coded	Blue (underweight), Green (normal), Orange (overweight), Red (obese)
Health Tips	Personalized recommendations based on BMI
BMI Guide	WHO classification table
Real-time Updates	Changes as you type or slide

BMI Categories (WHO)

Category	BMI Range	Color
Underweight	< 18.5	Blue
Normal Weight	18.5 — 24.9	Green
Overweight	25 — 29.9	Orange
Obese	≥ 30	Red

How to Use

1. Choose Units — Metric (kg/cm) or Imperial (lbs/in)
2. Enter Age (optional)
3. Enter Weight — type or use slider
4. Enter Height — type or use slider
5. View Results — BMI value, category, and health tips update instantly

Example Calculation

70 kg, 170 cm:

• BMI = 70 / (1.7 × 1.7) = 24.2
• Category: Normal Weight (Green)
• Healthy range: 18.5 — 24.9

Keyboard Shortcuts

• Ctrl/Cmd + Enter — Recalculate
• Ctrl/Cmd + R — Reset to defaults