BMI Calculator

Body Mass Index (BMI) is a simple calculation using a person's height and weight. The formula is BMI = kg/m² where kg is a person's weight in kilograms and m² is their height in meters squared. BMI is used to screen for weight categories that may lead to health problems.

Understanding BMI Categories

Underweight (BMI < 18.5): May indicate malnutrition, eating disorder, or other health problems
Normal weight (BMI 18.5-24.9): Indicates a healthy weight range
Overweight (BMI 25-29.9): May increase risk of health problems
Obese (BMI ≥ 30): Significantly increases risk of serious health conditions

BMI Formulas

Metric: BMI = weight (kg) ÷ height² (m²)
Imperial: BMI = (weight (lbs) ÷ height² (inches²)) × 703

Limitations of BMI

While BMI is a useful screening tool, it has limitations:

Doesn't distinguish between muscle and fat mass
May not be accurate for athletes or very muscular individuals
Doesn't account for age, sex, or ethnicity differences
Doesn't measure body fat distribution
May not be accurate for elderly individuals

Health Risks by BMI Category

Underweight: Weakened immune system, osteoporosis, anemia
Overweight: Type 2 diabetes, high blood pressure, heart disease
Obese: Stroke, certain cancers, sleep apnea, joint problems

When to See a Doctor

If your BMI is outside the normal range, consider consulting with a healthcare provider. They can assess your overall health, body composition, and risk factors to provide personalized recommendations for achieving or maintaining a healthy weight.

Tips for Healthy Weight

Eat a balanced diet rich in fruits, vegetables, and whole grains
Exercise regularly (at least 150 minutes per week)
Get adequate sleep (7-9 hours per night)
Manage stress through healthy coping mechanisms
Stay hydrated by drinking plenty of water
Avoid crash diets and focus on sustainable lifestyle changes

BMI Calculator

Calculate Your BMI

BMI Categories