BMI Calculator
Calculate your Body Mass Index (BMI) and see what it means for your health. Supports both imperial and metric units.
Your BMI
25.1
Healthy weight range for your height
129 – 174 lbs
| Category | BMI Range |
|---|---|
| Underweight | 0 – 18.5 |
| Normal weight | 18.5 – 25 |
| Overweight← You | 25 – 30 |
| Obese (Class 1) | 30 – 35 |
BMI is a screening tool only. Consult a healthcare provider for personalized health assessment.
Frequently Asked Questions
What is a healthy BMI?
The CDC defines BMI ranges as: Underweight (below 18.5), Normal weight (18.5–24.9), Overweight (25–29.9), and Obese (30 and above). These ranges apply to adults 20 years and older.
Is BMI accurate?
BMI is a useful screening tool but has limitations. It doesn't distinguish between muscle and fat mass, so athletes may have a high BMI despite low body fat. It also doesn't account for age, sex, or body composition differences across ethnic groups.
How is BMI calculated?
BMI = weight (kg) ÷ height² (m²). In imperial units: BMI = (weight in lbs × 703) ÷ height in inches². For example, a 180 lb person who is 5'10" (70 inches) has a BMI of (180 × 703) ÷ 70² = 25.8.
What BMI is considered obese?
A BMI of 30 or higher is classified as obese. Class 1 obesity is 30–34.9, Class 2 is 35–39.9, and Class 3 (severe obesity) is 40 and above. Obesity is associated with increased risk of heart disease, diabetes, and other conditions.