BMI Calculator
Our BMI (Body Mass Index) calculator helps you determine your body mass index based on your height and weight. BMI is a widely used screening tool that can indicate whether you may have a healthy weight for your height.
BMI Results
BMI Categories
Note: BMI is a screening tool, not a diagnostic tool. Factors such as muscle mass, age, sex, ethnicity, and body fat distribution are not accounted for in BMI calculations.
What is BMI?
Body Mass Index (BMI) is a numerical value calculated from your height and weight. It provides a simple way to categorize individuals as underweight, normal weight, overweight, or obese. The formula for BMI is:
- Metric: BMI = weight (kg) / height² (m²)
- Imperial: BMI = (weight (lbs) × 703) / height² (inches²)
BMI Categories
BMI values are interpreted using standard weight status categories that are the same for all adults, regardless of age or gender:
| BMI Range | Weight Status |
|---|---|
| Below 18.5 | Underweight |
| 18.5 - 24.9 | Normal weight |
| 25.0 - 29.9 | Overweight |
| 30.0 and above | Obesity |
How to Use the BMI Calculator
- Select your preferred unit system - Choose between metric (kilograms, centimeters) or imperial (pounds, feet, inches)
- Enter your height - In centimeters for metric or feet and inches for imperial
- Enter your weight - In kilograms for metric or pounds for imperial
- View your results - Your BMI value and weight category will be displayed instantly
Understanding Your BMI Results
Your BMI result falls into one of four categories:
Underweight (BMI less than 18.5)
Being underweight may indicate malnutrition, an eating disorder, or other health problems. If you're underweight, consider consulting with a healthcare provider.
Normal Weight (BMI 18.5 - 24.9)
This range is generally associated with the lowest health risks for most adults. Maintaining a weight in this range is often recommended for optimal health.
Overweight (BMI 25.0 - 29.9)
Being overweight may increase your risk for certain health conditions like heart disease, high blood pressure, and type 2 diabetes. Small weight reductions can provide health benefits.
Obesity (BMI 30.0 and above)
Obesity is associated with higher risks for many serious health conditions, including heart disease, stroke, type 2 diabetes, and certain cancers. If your BMI falls in this range, consider discussing weight management strategies with a healthcare provider.
Limitations of BMI
While BMI is a useful screening tool, it has several limitations:
- Doesn't account for body composition - BMI doesn't distinguish between muscle and fat. Athletes with high muscle mass may have a high BMI without excess fat.
- Doesn't consider fat distribution - Where you carry your weight matters. Abdominal fat carries more health risks than fat in other areas.
- May not be accurate for all populations - BMI may not be as accurate for certain ethnic groups, older adults, or very short individuals.
- Doesn't assess overall health - BMI is just one factor and doesn't consider other important health indicators like blood pressure, cholesterol levels, or blood sugar.
When to Consult a Healthcare Professional
BMI is a screening tool, not a diagnostic tool. If you have concerns about your weight or health, consult with a healthcare provider who can:
- Evaluate your overall health status
- Consider your personal and family medical history
- Assess other health indicators
- Provide personalized recommendations
Remember that healthy bodies come in many shapes and sizes, and BMI is just one of many tools to assess health.