What is BMI and how is it calculated?

BMI (Body Mass Index) is a measure of body fat based on height and weight. It's calculated as weight (kg) divided by height (meters) squared, or weight (lbs) divided by height (inches) squared times 703.

What are the BMI categories?

BMI categories according to WHO: Underweight (below 18.5), Normal weight (18.5-24.9), Overweight (25-29.9), Obese Class I (30-34.9), Obese Class II (35-39.9), Obese Class III (40 and above).

Is BMI accurate for everyone?

BMI is a screening tool but has limitations. It doesn't distinguish between muscle and fat mass, so athletes with high muscle mass may have high BMI but low body fat. It's also less accurate for older adults, children, and certain ethnic groups.

What is a healthy BMI range?

A healthy BMI range is 18.5-24.9 according to WHO guidelines. However, optimal ranges may vary slightly based on age, ethnicity, and individual factors. Consult healthcare providers for personalized assessments.

How often should I calculate my BMI?

Monitor BMI monthly or quarterly as part of overall health tracking. Daily fluctuations are normal due to water weight, so focus on trends over time rather than single measurements.

BMI Calculator - Body Mass Index Calculator

Calculate Your Body Mass Index (BMI)

Determine your BMI and health category using the standard WHO formula. Get BMI categories, ideal weight ranges, and health recommendations based on your height and weight measurements.

⚠️ Health & Science Disclaimer

Important: BMI is a screening tool based on population statistics and the WHO formula (weight/height²). It doesn't distinguish between muscle and fat mass, so results may not be accurate for athletes, bodybuilders, or individuals with high muscle mass.

Not Medical Advice: BMI results are for educational purposes only and should not replace professional medical advice. Individual health assessments should consider body composition, medical history, and other factors beyond BMI.

Data Sources: BMI categories based on World Health Organization guidelines and validated by medical associations. Consult healthcare providers for personalized health assessments.

📚 Understanding BMI

BMI (Body Mass Index) is a measure that uses height and weight to estimate if you're a healthy weight for your height. It's calculated as weight divided by height squared.

BMI Formula:

Metric: BMI = weight (kg) ÷ height (m)²
Imperial: BMI = [weight (lbs) ÷ height (inches)²] × 703

BMI Limitations:

Muscle vs Fat: Doesn't distinguish between muscle and fat mass
Age Factor: Less accurate for children and older adults
Ethnicity: Optimal ranges may vary by ethnic background
Body Shape: Doesn't account for fat distribution patterns

WHO BMI Categories:

Underweight: Below 18.5 (may indicate malnutrition)
Normal weight: 18.5-24.9 (associated with lowest health risks)
Overweight: 25-29.9 (increased health risks)
Obese: 30+ (significantly increased health risks)

Fitness Flash Report

📊 BMI Calculator

Calculate Your Body Mass Index (BMI)

📊 Your BMI Results

⚠️ Health & Science Disclaimer

📚 Understanding BMI