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Body Gang Education gives you straight-up, expert-backed guidance that cuts through the noise and tells you exactly what works—and why. From The Method to What the Fck Are Macros*, and our 30-Day Belly Fat Burn Blueprint—you’re not just learning theory. You’re getting a step-by-step strategy to shift habits, tighten discipline, and see change. It’s structured. It’s aggressive. And it’s built to get you out of your way.
Expect raw truth, clear direction, and no sugarcoating. You’ll also get a complete nutritional breakdown, macro targets, and meal strategies that match your fitness game plan. No starvation. No fluff. Just real results.
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Body Mass Index
What is BMI
What is BMI?
BMI (Body Mass Index) measures body leanness or corpulence based on height and weight. It's a general indicator of whether a person has a healthy weight for their height.
BMI Classification for Adults
| Classification | BMI range (kg/m²) |
|---|---|
| Severe Thinness | < 16 |
| Moderate Thinness | 16 - 17 |
| Mild Thinness | 17 - 18.5 |
| Normal | 18.5 - 25 |
| Overweight | 25 - 30 |
| Obese Class I | 30 - 35 |
| Obese Class II | 35 - 40 |
| Obese Class III | > 40 |
BMI for Children and Teens (Ages 2–20)
| Category | Percentile Range |
|---|---|
| Underweight | < 5% |
| Healthy weight | 5% - 85% |
| At risk of overweight | 85% - 95% |
| Overweight | > 95% |
Risks of Being Overweight
- High blood pressure, Type II diabetes, coronary heart disease
- Osteoarthritis, sleep apnea, certain cancers
- Lower quality of life, depression, increased risk of mortality
Risks of Being Underweight
- Malnutrition, osteoporosis, lowered immune function
- Growth/development issues, reproductive problems, surgery risks
- Possible underlying medical conditions
Limitations of BMI
BMI does not account for muscle mass, fat distribution, age, or gender. It may misclassify muscular individuals or misestimate fat in seniors or children.
BMI Formulas
- US Units: BMI = 703 × weight (lbs) / height² (in)
- Metric Units: BMI = weight (kg) / height² (m)
Example: A person 5'10" and 160 lbs has a BMI of 23.0
BMI Prime
BMI Prime = BMI / 25
Used to assess how far someone is from the healthy upper limit. A value above 1 indicates overweight; below 0.74 indicates underweight.
Ponderal Index
Similar to BMI, but height is cubed. It’s more accurate for very tall or very short individuals.
- US Units: PI = height (in) / ∛weight (lbs)
- Metric Units: PI = weight (kg) / height³ (m)
Calculator
Body Gang BMI Calculator
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