Calculate your Body Mass Index (BMI) and discover your World Health Organization (WHO) weight classification category.
BMI Calculator Results
Your BMI Score
23 kg/m²
Weight Category
Normal weight
WHO Standard
Healthy Weight Range
128.9 – 173.5 lbs
BMI 18.5 – 24.9
Prime Metric
0.92
BMI Prime (ratio to 25)
Note: BMI is an estimate and does not directly measure body fat percentage or muscle mass. Athletes and elderly individuals may have different ideal ranges.
The standard WHO metric categorizing body weight relative to height squared.
📐 Step-by-Step Calculation Breakdown
Substituted values from your current calculation inputs:
Unit System: us
Height (Feet): 5
Height (Inches): 10
Weight (lbs): 160
Height (cm): 178
Weight (kg): 72
How to Use This Calculator
Choose your preferred unit system (US / Imperial or Metric).
Enter your height and current weight.
Optionally specify your age and biological sex.
Click Calculate to see your BMI score and healthy weight range.
Example Calculation
A person who is 5 ft 10 in (70 in) and weighs 160 lbs has a BMI of 23.0, which falls into the Normal / Healthy Weight range (18.5 – 24.9).
Understanding the Results
BMI is an informational screening tool. Muscle mass, bone density, age, and sex affect health risk.
BMI Calculator — Understanding Body Mass Index
Body Mass Index (BMI) is a widely used screening tool that estimates body fatness based on height and weight. It was developed by Belgian statistician Adolphe Quetelet in the 19th century and has been adopted by the World Health Organization (WHO) as a population-level health metric.
What Is BMI?
BMI is a ratio of body mass to the square of height. It acts as a simple proxy for body fatness and is used by clinicians worldwide as an initial screening indicator for underweight, healthy weight, overweight, or obesity classifications.
BMI is a useful population screening tool, but it has well-documented limitations for individual assessment:
Athletes and bodybuilders often have high BMI due to muscle mass, not fat — they may be classified as "overweight" despite being extremely lean and healthy.
Older adults may have a "normal" BMI while carrying significant visceral fat due to age-related muscle loss (sarcopenia).
Ethnic variation: Studies show that South Asian and East Asian populations have higher body fat and cardiometabolic risk at lower BMI values. The WHO has proposed adjusted thresholds for Asian populations.
Pregnancy: BMI is not applicable during pregnancy.
BMI vs Body Fat Percentage — Which Is Better?
For most people, BMI provides a quick and free first approximation. For a more accurate picture of health, combine BMI with Body Fat Percentage, waist circumference, and ideally waist-to-height ratio. Together, these metrics paint a much more complete picture than any single measurement alone.
Medical Disclaimer: Medical Disclaimer: This calculator provides mathematical estimates based on published physiological equations for educational purposes only. It does not provide medical advice, diagnosis, or treatment. Always consult a qualified physician or healthcare professional before making health decisions.
Frequently Asked Questions
What is a healthy BMI for adults?
A healthy BMI according to the WHO is between 18.5 and 24.9 kg/m² for adult men and women.
Does BMI apply to athletes with high muscle mass?
BMI can overestimate body fat in athletes because muscle tissue is denser and weighs more than adipose fat.
⚖️Body Composition & Weight Assessment Cluster
Related Calculators & Recommended Tools
Body fat percentage, BMI benchmarks, lean mass, military body fat, ideal weight, and body frame shape. Use these interconnected tools to verify results and explore alternative calculation scenarios:
Health calculator results are statistical estimates based on published population formulas. They are not medical diagnoses. Consult a qualified professional for medical decisions.
