BMI Result: 6ft 5in, 138 lbs (BMI 16.4) - Male
According to CDC and WHO standards, a BMI of 16.4 is classified as Underweight.
A male who is 6ft 5in tall and weighs 138lbs has a BMI of 16.4, which falls into the Underweight category used by the CDC and WHO for adults.
| Category | BMI Range |
|---|---|
| Underweight | < 18.5 |
| Underweight | < 18.5 |
| Obese | ≥ 30 |
Healthy weight range for 6ft 5in: 156 lbs – 210 lbs
Metric: 195.6 cm, 62.6 kg
📏 Healthy waist circumference for your height: 35" – 40" (below 40" for male)
So you're 6ft 5in and weigh 138lbs. Your BMI is 16.4, which falls into the Underweight category according to CDC and WHO standards. Let's break down what this means for your health.
Adjust Your Numbers
Change your height or weight to see how your BMI changes.
Understanding Your BMI
A BMI below 18.5 may indicate nutritional insufficiency. According to the CDC, this range is associated with increased risk of bone density loss and immune function decline. Consulting a healthcare provider is recommended for a thorough nutritional assessment.
What This Means for Your Height
For men over 6ft, BMI may overestimate body fat due to higher muscle mass. Consider waist circumference and body fat percentage for a more accurate assessment.
Weight & Threshold
Gaining approximately 17.7 lbs would bring your BMI to 18.5, the start of the next category.
⬆️ Gaining approximately 17.7 lbs would put you in the Normal BMI range.
Waist & Health
The CDC recommends that men keep waist circumference below 40 inches. A waist-to-height ratio below 0.5 is also associated with lower health risks.
Age Context
For children and teenagers (under 18), BMI is interpreted differently. Unlike adults, BMI for youth is age- and sex-specific, using percentiles from CDC growth charts. For a 11-year-old boy at 6ft 5in and 138lbs, a BMI of 16.4 would be evaluated using pediatric growth percentiles rather than the adult underweight category.
👉 Use our Child BMI Calculator for a more accurate assessment for children and teens under 18.
👉 Visit our Kids BMI Percentile tool for detailed growth tracking.
Health Analysis
Recommendations
General Health
A BMI of 16.4 is below the CDC and WHO healthy range of 18.5-24.9. This may indicate nutritional insufficiency. Consulting a healthcare provider is recommended for a thorough nutritional assessment.
Monitoring
In addition to BMI, pay attention to waist circumference. The CDC recommends males stay under 40 inches. Regular tracking of your measurements over time provides the most useful insight into your health trends.
Next Steps
If you're concerned about your weight or body composition, a healthcare provider can offer personalized guidance based on your full health profile.
Personalized Notes
Physical Activity
For a man at 6ft 5in, focus on strength training 3-4 times per week to build muscle mass. Compound exercises like squats, deadlifts, and bench press are most effective. The CDC recommends consulting a healthcare provider before starting any new exercise program.
Goals
For a man at 6ft 5in, the CDC recommends a healthy weight range of 156-210lbs. At 138lbs, you're below this range. Consider setting a goal to gain 5-10% of your current weight over the next 3-6 months.
Frequently Asked Questions
What else should I track besides BMI for a 6ft 5in man?
Am I at a healthy weight at 6ft 5in and 138lbs?
What health risks are associated with a BMI of 16.4 for a 6ft 5in man?
What is the BMI for a 6ft 5in man at 138lbs?
Related Tools & Articles
💡 About this calculation: BMI = (138 × 703) ÷ (77 × 77) = 16.4 | Metric: 195.6 cm, 62.6 kg
📖 Recommended reading:
Editorial Review: This page was generated by the BMI Calculator Web Editorial Team and reviewed at template and content-pool level for accuracy and guideline alignment by Dr. Sarah K. Johnson, PhD, RD. All content is aligned with current WHO, CDC, and NIH guidelines.
Published: 2026-10-07