BMI Calculator
Calculate your Body Mass Index and determine your weight category.
Body Measurements
BMI Results
Body Mass Index
22.9
Category
Normal weight
Healthy Weight Range
56.7 kg - 76.3 kg
BMI Categories:
Underweight: < 18.5
Normal: 18.5 - 24.9
Overweight: 25 - 29.9
Obese: ≥ 30
About This Calculator
The BMI (Body Mass Index) Calculator helps you determine your body mass index, which is a measure of body fat based on height and weight. BMI is widely used as a screening tool to identify potential weight problems in adults.
While BMI is a useful screening tool, it doesn't directly measure body fat and may not accurately reflect body composition for athletes, older adults, or those with high muscle mass. It's best used as a general indicator alongside other health metrics.
Formula & Calculation Method
BMI Calculation:
Metric Formula:
BMI = Weight (kg) ÷ Height (m)²
Imperial Formula:
BMI = (Weight (lbs) ÷ Height (inches)²) × 703
BMI Categories:
Underweight: BMI < 18.5
Normal weight: BMI 18.5-24.9
Overweight: BMI 25-29.9
Obese: BMI ≥ 30
BMI provides a simple numeric measure of a person's thickness or thinness. It's calculated by dividing weight by the square of height. The World Health Organization (WHO) uses these standard categories, though some organizations may use slightly different ranges.
How to Use This Calculator
- Select Unit System: Choose metric (kg, cm) or imperial (lbs, feet/inches).
- Enter Height: Input your height in centimeters (metric) or feet and inches (imperial).
- Enter Weight: Input your weight in kilograms (metric) or pounds (imperial).
- View Results: See your BMI value, weight category, and healthy weight range.
Frequently Asked Questions
What is a healthy BMI?
A healthy BMI is typically between 18.5 and 24.9. This range is associated with the lowest risk of health problems. However, BMI is just one indicator and should be considered alongside other factors.
Is BMI accurate for everyone?
BMI may not be accurate for athletes with high muscle mass (may show as overweight), older adults (may underestimate body fat), or those with low muscle mass (may underestimate health risks). It's a screening tool, not a diagnostic measure.
What if my BMI is in the overweight or obese range?
If your BMI indicates overweight or obesity, consider consulting with a healthcare provider. They can help assess your overall health, including body composition, and develop a personalized plan for weight management if needed.
Can BMI be used for children?
BMI calculations for children and teens use the same formula but are interpreted differently using age and sex-specific percentile charts. This calculator is designed for adults (18+).
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