BMI Calculator - Body Mass Index Calculator
Calculate your Body Mass Index (BMI) and determine if you are underweight, normal weight, overweight, or obese. Free, accurate BMI calculator with imperial and metric units.
About This Calculator
Body Mass Index (BMI) is a simple calculation using your height and weight to determine if your weight falls within a healthy range. While BMI has limitations (it doesn't account for muscle mass or body composition), it's a useful screening tool recommended by the CDC and WHO for assessing weight-related health risks.
How is BMI Calculated?
BMI is calculated using the formula: weight (kg) / height (m)² for metric units, or (weight (lbs) / height (in)²) × 703 for imperial units. The resulting number is then classified into categories: underweight (<18.5), normal weight (18.5-24.9), overweight (25-29.9), or obese (≥30).
BMI Limitations
While BMI is a useful screening tool, it has limitations. It doesn't distinguish between muscle and fat mass, so athletes or very muscular individuals may have high BMIs despite being healthy. It also doesn't account for body fat distribution or other health markers. Always consult healthcare professionals for comprehensive health assessments.
What is a Healthy BMI?
For most adults, a BMI between 18.5 and 24.9 is considered healthy. However, optimal BMI can vary based on factors like age, sex, ethnicity, and individual body composition. Some research suggests slightly different ranges may be healthier for certain populations.
Find Foods That Fit Your Goals
Now that you know your targets, explore our food database to find meals that match your calorie and macro goals.