BMI Calculator: What Your Body Mass Index Really Means
BMI is the world's most widely used health metric — but it has serious limitations. Here's what it tells you, what it misses, and what to track instead.
How to Calculate BMI
BMI formula: BMI = weight (kg) ÷ height² (m)
Example: 75 kg, 175 cm → BMI = 75 ÷ (1.75²) = 75 ÷ 3.0625 = 24.5
BMI Categories (WHO)
- 🔵 Below 18.5: Underweight
- 🟢 18.5 – 24.9: Normal weight
- 🟡 25.0 – 29.9: Overweight
- 🔴 30.0 and above: Obese
The Problem with BMI
BMI doesn't distinguish between muscle and fat. A professional athlete with 8% body fat and 85 kg of muscle can have a BMI of 28 — technically "overweight." Meanwhile, a sedentary person with 28% body fat and little muscle might have a "healthy" BMI of 23. This is the core flaw of the metric.
- BMI doesn't account for fat distribution (visceral fat is far more dangerous than subcutaneous fat)
- It varies significantly by ethnicity (Asian populations face health risks at lower BMI thresholds)
- It doesn't reflect cardiovascular fitness or metabolic health
Better Metrics to Track
- Waist-to-height ratio: Waist should be less than half your height. Simple and highly predictive of metabolic risk.
- Body fat percentage: More accurate than BMI for assessing actual composition.
- Progress photos + weight trend: Track direction of change over weeks, not daily fluctuations.
- Energy levels and performance: The best health marker is how you feel and function.
Yedimmi Tracks What Actually Matters
Yedimmi automatically calculates your BMI from your profile data. More importantly, it tracks your weekly weight trend, nutrition quality score, and activity level — a far more complete picture of your health progress than BMI alone.
Track Your Health Progress with Yedimmi
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