1Select Imperial (lbs, feet/inches) or Metric (kg, cm).
2Enter your height and weight.
3Click Calculate BMI to see your result and category instantly.
What Is BMI?
Body Mass Index (BMI) is a numerical value calculated from a person's height and weight. It provides a simple screening tool to categorize adults into underweight, normal weight, overweight, or obese ranges. The CDC and World Health Organization use BMI as a cost-effective, non-invasive tool for population-level health monitoring.
BMI Formula
Imperial: BMI = (weight in lbs × 703) ÷ (height in inches)²
Metric: BMI = weight in kg ÷ (height in meters)²
Limitations of BMI
BMI does not distinguish between muscle and fat mass. Athletes and highly muscular individuals may score as "overweight" despite having very low body fat. BMI also doesn't account for fat distribution — belly fat (visceral fat) poses greater health risks than fat stored elsewhere. For a complete picture, consider also measuring waist circumference and body fat percentage.
Healthy Weight Range by Height
To be in the "Normal Weight" BMI range (18.5–24.9), here are approximate healthy weight ranges for common heights:
5'4" (64 in): 108–145 lbs
5'6" (66 in): 115–154 lbs
5'9" (69 in): 125–168 lbs
5'11" (71 in): 132–178 lbs
6'0" (72 in): 136–183 lbs
6'2" (74 in): 144–194 lbs
Frequently Asked Questions
A BMI of 18.5 to 24.9 is considered normal and healthy for adults by the CDC. Below 18.5 is underweight, 25–29.9 is overweight, and 30 or above is classified as obese.
BMI is a general screening tool and not a diagnostic measure. It correlates moderately well with body fat in the general population, but can be inaccurate for athletes, elderly individuals, pregnant women, and some ethnic groups. Always pair BMI with a professional health assessment.
Yes, according to standard BMI classifications, a score of 25.0 or above falls into the "overweight" category. However, this is a general guideline. A BMI of 25 in a fit, muscular person may not indicate excess body fat. Consult your doctor for a personalized assessment.
According to CDC data, the average BMI for American adults is approximately 29.7 for women and 29.1 for men — placing the average American in the "overweight" category (25–29.9). About 42% of US adults are classified as obese (BMI ≥ 30).
To lower your BMI, you need to reduce body fat through a caloric deficit (consuming fewer calories than you burn). A combination of a balanced, moderate-calorie diet and regular physical activity is the most sustainable approach. Even a 5–10% reduction in body weight can significantly improve health markers.