BMI Calculator -- Body Mass Index
Calculate Body Mass Index (BMI) to evaluate body weight relative to height. Assess potential health risks based on standard World Health Organization criteria.
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📐 Formula
💡 Practical Example
175 cm, 70 kg: BMI = 70 ÷ (1.75)² = 70 ÷ 3.0625 = 22.86. Category: Normal Weight. Healthy range: 56.5–76.3 kg.
📖 About BMI Calculator -- Body Mass Index
The Body Mass Index (BMI), developed by Adolphe Quetelet in the 1830s, is a universally recognized screening metric estimating body fat based on weight and height. The formula is weight in kilograms divided by height in meters squared. The World Health Organization (WHO) defines standard categories: below 18.5 is considered underweight; 18.5 to 24.9 is normal weight; 25.0 to 29.9 is overweight; and 30.0 or higher is classified as obese. While BMI is a valuable population-level metric, it has limitations at the individual level. It does not account for muscle mass, bone density, or fat distribution. Athletes may have a high BMI due to increased muscle mass rather than excess body fat. Additionally, metabolic risk factors vary by ethnicity; Asian populations face higher risks for conditions like type 2 diabetes at lower BMI thresholds (23.0 and above), leading to tailored regional guidelines.
How to Use This Calculator
Enter your Measurement System — select from Metric (kg / cm), Imperial (lbs / ft, in), Height (Metric: cm) (e.g. 175 in cm), Height Feet (Imperial) (e.g. 5 in ft), Height Inches (Imperial) (e.g. 9 in in), Weight (Metric: kg) (e.g. 70 in kg), Weight (Imperial: lbs) (e.g. 154 in lbs), Age (e.g. 30 in years), and Sex — select from Male, Female. Results update instantly — no submit button needed. Use metric or imperial units as labeled. For the most accurate result, measure height and weight in the morning without shoes.
The Formula
BMI = Weight (kg) ÷ Height² (m²)
Imperial: BMI = [Weight (lbs) ÷ Height² (in²)] × 703
BMI Prime = BMI ÷ 25
Worked Example
175 cm, 70 kg: BMI = 70 ÷ (1.75)² = 70 ÷ 3.0625 = 22.
- Category: Normal Weight. Healthy range: 56.5–76.3 kg.
Understanding Your Result
WHO classification: Underweight below 18.5 — Normal weight 18.5–24.9 — Overweight 25.0–29.9 — Obese Class I 30.0–34.9 — Obese Class II 35.0–39.9 — Obese Class III 40 and above. BMI does not distinguish fat from muscle: athletes and those with high muscle mass often read overweight on BMI while having healthy body composition. For adults over 65, a BMI of 23–27 is associated with better outcomes than the standard "normal" range. Use waist circumference alongside BMI: above 88 cm (women) or 102 cm (men) indicates elevated metabolic risk regardless of BMI category.
💡 Expert Health Guidance & Clinical Context
- This calculator uses clinically validated formulas and population reference data published by the WHO and NIH. Results are screening estimates, not medical diagnoses.
- Consult a licensed healthcare provider before making any changes to diet, medication, or exercise based on these results — individual variation is significant.
- Genetics, chronic conditions, and concurrent medications can dramatically affect what a "normal" result means for a specific individual.
- Track your results over time: a single data point is less meaningful than a trend measured consistently across multiple weeks or months.
- The CDC recommends adults receive routine health screenings at least annually. Use these calculations to prepare informed questions for your physician.
- Body composition, lifestyle factors, and stress levels all interact with the metrics shown here. No single number captures your full health picture.
- For pediatric or geriatric populations, reference ranges may differ significantly from the adult standards used in general calculators.
- Always cross-reference results with laboratory tests, clinical examinations, and professional medical evaluation before acting on any finding.
Results are for informational and educational purposes only. Always verify critical decisions with a qualified professional.