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BMI Calculator - Body Mass Index Calculator
Free BMI calculator to check your body mass index. Find out if you're underweight, normal, overweight, or obese. See your healthy weight range.
BMI Calculator
Calculate your Body Mass Index
Your BMI Results
Enter your values to see results
and click the "Calculate" button
What is BMI?
Body Mass Index (BMI) is a measure of body fat based on height and weight. It's used to screen for weight categories that may lead to health problems. While BMI doesn't directly measure body fat, it correlates with health risks. A BMI between 18.5 and 24.9 is considered healthy for most adults.
How to Use This Calculator
- Enter your weight in kg or lbs
- Enter your height in cm or feet/inches
- Click Calculate to see your BMI
- Review your category and healthy weight range
BMI Formula
BMI = Weight (kg) / Height (m)²
For imperial: BMI = (Weight in lbs × 703) / (Height in inches)²
Frequently Asked Questions
What do BMI categories mean?
Underweight: Below 18.5. Normal: 18.5-24.9. Overweight: 25-29.9. Obese Class I: 30-34.9. Obese Class II: 35-39.9. Obese Class III: 40+.
Is BMI accurate for everyone?
BMI has limitations. It doesn't distinguish between muscle and fat, so athletes may have high BMI despite low body fat. It also doesn't account for age, gender, or fat distribution.
What is a healthy BMI?
A BMI of 18.5-24.9 is considered healthy for most adults. However, optimal BMI may vary by age and ethnicity.
How does BMI relate to health risks?
Higher BMI is associated with increased risk of heart disease, type 2 diabetes, high blood pressure, sleep apnea, and certain cancers.
Is BMI different for children?
Yes, children's BMI is interpreted using age and gender-specific percentiles. A child in the 85th-95th percentile is overweight; above 95th is obese.
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