BMI Calculator
Calculate your Body Mass Index to understand your weight category and get personalized health recommendations.
Your Measurements
Weight
kg
lbs
Height
cm
ft
Your BMI
24.2
Normal
Healthy Weight Range
53.5 - 72 kg
Recommended Daily Steps
10,000
BMI Categories
World Health Organization BMI classification for adults
| Category | BMI Range |
|---|---|
| Underweight | < 18.5 |
| Normal | 18.5 - 24.9 |
| Overweight | 25.0 - 29.9 |
| Obese Class I | 30.0 - 34.9 |
| Obese Class II | 35.0 - 39.9 |
| Obese Class III | ≥ 40.0 |
Understanding BMI
Body Mass Index (BMI) is a simple calculation using your height and weight to estimate body fat and assess whether you're at a healthy weight. It's widely used as a screening tool for weight categories.
The Formula
BMI = Weight (kg) ÷ Height (m)²
- Example: A person weighing 70 kg with height 1.75 m has BMI = 70 ÷ (1.75 × 1.75) = 22.9
Common Questions
What is a healthy BMI?
A BMI between 18.5 and 24.9 is considered healthy for most adults. However, BMI doesn't account for muscle mass, bone density, or fat distribution, so it's just one factor in assessing overall health.
Is BMI accurate for everyone?
BMI may not be accurate for athletes with high muscle mass, elderly individuals, or people with certain body types. It's a useful screening tool but should be considered alongside other health indicators.
How can I improve my BMI?
If your BMI is outside the healthy range, focus on sustainable lifestyle changes: regular physical activity (like daily walking), balanced nutrition, and adequate sleep. Consult a healthcare professional for personalized advice.
How many steps should I walk based on my BMI?
For maintaining a healthy BMI, aim for 10,000 steps daily. If you're looking to lose weight, consider 12,000+ steps. Start with your current level and gradually increase by 1,000 steps per week.
Is BMI different for children?
Yes, BMI for children and teens is calculated differently and compared to age and sex-specific percentiles. This calculator is designed for adults 18 and older. For children, consult a pediatrician.
How to calculate your BMI
Body Mass Index (BMI) estimates body composition category from height and weight, using the CDC adult categories.
Enter your height
Enter height in centimeters or feet/inches.Enter your weight
Enter weight in kilograms or pounds.Read your BMI and category
The calculator returns your BMI value and the CDC health category (underweight, healthy, overweight, obese) with a short description of each.