BMI Result: 6ft 5in, 123 lbs (BMI 14.6) - Male
According to CDC and WHO standards, a BMI of 14.6 is classified as Underweight.
A male who is 6ft 5in tall and weighs 123lbs has a BMI of 14.6, 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, 55.8 kg
📏 Healthy waist circumference for your height: 35" – 40" (below 40" for male)
So you're 6ft 5in and weigh 123lbs. Your BMI is 14.6, 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 32.9 lbs would bring your BMI to 18.5, the start of the next category.
⬆️ Gaining approximately 32.9 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
At ages 18-19, BMI interpretation transitions. This age range sits between pediatric percentiles and adult fixed cutoffs. A 19-year-old man at 6ft 5in and 123lbs has a BMI of 14.6, which falls into the Underweight category under adult CDC/WHO standards.
👉 For younger individuals, visit our Teen BMI Calculator.
👉 Check your Healthy Weight Range for more context.
Health Analysis
Recommendations
General Health
A BMI of 14.6 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.
Frequently Asked Questions
What is the BMI for a 6ft 5in man at 123lbs?
Is 123lbs overweight for a 6ft 5in man?
What health risks are associated with a BMI of 14.6 for a 6ft 5in man?
What percentage of men have a BMI of 14.6 at 6ft 5in?
Related Tools & Articles
💡 About this calculation: BMI = (123 × 703) ÷ (77 × 77) = 14.6 | Metric: 195.6 cm, 55.8 kg
📖 Recommended reading:
Published: 2026-09-05