BMI Calculator

Calculate your Body Mass Index to determine if you're underweight, normal, overweight, or obese.

Weight (lbs)

Height

BMI Categories

Underweight	Below 18.5
Normal weight	18.5 - 24.9
Overweight	25 - 29.9
Obese	30 and above

Note: BMI is a general indicator and does not account for muscle mass, bone density, age, or gender. Consult a healthcare professional for personalized advice.

How to Use This Calculator

Select your preferred unit system (US or Metric)
Enter your weight in pounds or kilograms
Enter your height in feet/inches or centimeters
Click 'Calculate BMI' to see your result
Review your BMI category and healthy weight range

Formula

BMI = weight (kg) / height (m)²

Frequently Asked Questions

What is BMI?▼

BMI (Body Mass Index) is a measure of body fat based on height and weight. It's calculated by dividing your weight in kilograms by your height in meters squared. BMI is used as a screening tool to identify potential weight problems in adults.

What is a healthy BMI range?▼

A healthy BMI is generally considered to be between 18.5 and 24.9. Below 18.5 is classified as underweight, 25-29.9 as overweight, and 30 or above as obese. However, BMI doesn't account for factors like muscle mass, bone density, age, and gender.

Is BMI accurate for athletes?▼

BMI may not be accurate for athletes or people with high muscle mass. Since muscle weighs more than fat, athletes may have a high BMI despite having low body fat. Other measurements like body fat percentage may be more appropriate for these individuals.

Does BMI apply to children?▼

For children and teens, BMI is calculated the same way but interpreted differently. It's compared to growth charts that account for age and gender, resulting in a BMI percentile. A healthcare provider should interpret children's BMI.

How often should I check my BMI?▼

Checking your BMI once every few months is generally sufficient unless you're actively trying to change your weight. Focus on overall health habits rather than daily BMI fluctuations.