BMI Calculator
Calculate Body Mass Index (BMI) and discover your healthy adult weight range.
Your BMI is within the healthy weight category recommended by WHO.
How to Calculate Body Mass Index (BMI)
- Select your preferred measurement units: Metric (cm, kg) or Imperial (feet/inches, lbs).
- Enter your current body weight.
- Enter your standing height without shoes.
- View your BMI score instantly along with your official WHO weight category classification.
WHO Metric & Imperial BMI Formulas
-
Metric Formula:
BMI = Weight (kg) / [ Height (m) ]² -
Imperial Formula:
BMI = [ Weight (lbs) × 703 ] / [ Height (inches) ]² - WHO Classifications: Underweight (< 18.5) | Normal weight (18.5 – 24.9) | Overweight (25.0 – 29.9) | Obesity Class I (30.0 – 34.9) | Obesity Class II (35.0 – 39.9) | Severe Obesity (≥ 40.0).
Screening Example
-
An adult weighing
70 kgwith a height of175 cm (1.75 m):BMI = 70 / (1.75 × 1.75) = 70 / 3.0625 = 22.86.
Classification: Normal Weight (Healthy Range).
Common Applications
- Preliminary population-level wellness screening benchmark.
- General fitness journey baseline progress tracking.
- Insurance health assessment reference.
Important Clinical Limitations of BMI
- BMI cannot differentiate between lean muscular mass and adipose fat tissue. Muscular athletes often register falsely in the "overweight" category despite possessing low body fat percentages.
- BMI does not measure visceral fat distribution around abdominal internal organs, which carries greater metabolic significance.
- Age and bone density variations among geriatric populations and growing teenagers require specialized pediatric percentiles.
Frequently Asked Questions
Is BMI an accurate measure for athletes?
No. Athletes with high muscle mass often have elevated BMIs that do not reflect excess body fat. Body composition scans (such as DEXA) offer superior clinical accuracy.
What is the healthy BMI range for adults?
According to the World Health Organization (WHO), a BMI between 18.5 and 24.9 is considered within the normal, healthy adult weight range.
Is personal biometric data saved?
No. All calculations run strictly in your web browser. Your physical measurements are never recorded or sent to any external server.
Medical Disclaimer: Body Mass Index (BMI) is a general statistical screening estimate and does not constitute medical diagnosis or healthcare advice. Consult a licensed physician or registered dietitian for comprehensive clinical health evaluations.