BMI Calculator
Calculate your Body Mass Index instantly. Supports metric and imperial units.
BMI Categories (WHO)
| Category | BMI Range |
|---|---|
| Underweight | < 18.5 |
| Normal weight | 18.5 – 24.9 |
| Overweight | 25.0 – 29.9 |
| Obese (Class I) | 30.0 – 34.9 |
| Obese (Class II+) | ≥ 35.0 |
How It Works
Enter Height
In cm (metric) or feet & inches (imperial).
Enter Weight
In kg (metric) or lbs (imperial).
Get Your BMI
Instant result with WHO category and visual bar.
Features
Dual Unit System
Switch between metric (kg/cm) and imperial (lbs/ft-in) with one click.
Visual BMI Bar
Animated pointer shows exactly where you fall on the BMI scale.
Real-Time Calculation
Results update as you type. No button needed.
Healthy Range Info
Shows your healthy weight range based on your height and WHO guidelines.
Pro Tips
- ●BMI = weight (kg) ÷ height (m)². For imperial: BMI = 703 × weight (lbs) ÷ height (in)².
- ●BMI is a screening tool, not a diagnostic measure. It doesn’t account for muscle mass, bone density, or body composition.
- ●A “normal” BMI (18.5–24.9) doesn’t guarantee perfect health. Consult a healthcare professional for personalized advice.
Frequently Asked Questions
What is BMI?
Body Mass Index (BMI) is a number calculated from your weight and height. It provides a simple, widely-used indicator of body fat and is used to screen for weight categories.
Is BMI accurate for athletes?
BMI may overestimate body fat in athletes and people with high muscle mass. It’s a screening tool, not a definitive health measure.
Does this tool store my data?
No. All calculations happen in your browser. No data is sent to any server, and nothing is stored.