Why is BMI inaccurate?

BMI only uses height and weight, ignoring muscle mass, bone density, and body composition. A muscular athlete and sedentary person at the same height/weight have identical BMIs but vastly different health risks.

What should I track instead of BMI?

Track body fat percentage, waist-to-height ratio, and fitness markers like resting heart rate, blood pressure, and strength. These metrics reflect actual health status better than BMI alone.

What is a healthy body fat percentage?

For men: 10-20% is athletic to fit, 20-25% average. For women: 18-28% is athletic to fit, 25-31% average. Athletes may be lower.

How do I measure body fat percentage?

Use the Body Fat Calculator with circumference measurements for estimates. For accuracy, use DEXA scans, hydrostatic weighing, or bioelectrical impedance scales at a gym or clinic.

Can BMI be wrong for athletes?

Yes, BMI commonly misclassifies muscular individuals as overweight or obese. Muscle weighs more than fat, so athletes often have high BMIs despite low body fat and excellent health.

What is the waist-to-height ratio?

Divide waist circumference by height. Below 0.5 is healthy, 0.5-0.6 is moderate risk, above 0.6 is high risk. This is a better predictor of health than BMI.

Is BMI outdated science?

BMI was invented in 1832 for population studies, not individual health. Modern research shows it's only 50% accurate. Better metrics like body fat percentage are now recommended.

Should I still calculate my BMI?

Use BMI for context only, not diagnosis. If your BMI is high but body fat is normal, trust the body fat measurement. BMI is useful for tracking population trends, not personal health.

Loading BMI Is a Lie: Why I Stopped Trusting the Scale (And What I Track Instead)

BMI Is a Lie: Why I Stopped Trusting the Scale (And What I Track Instead)

For 10 years, BMI told me I was 'overweight' while my body fat was 12%. Here's why the BMI calculator is outdated science and the free tools that actually matter.

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