BMI Result: 6ft 4in, 140 lbs (BMI 17.0) - Male
According to CDC and WHO standards, a BMI of 17.0 is classified as Underweight.
A male who is 6ft 4in tall and weighs 140lbs has a BMI of 17.0, 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 4in: 152 lbs – 205 lbs
Metric: 193.0 cm, 63.5 kg
📏 Healthy waist circumference for your height: 35" – 40" (below 40" for male)
So you're 6ft 4in and weigh 140lbs. Your BMI is 17.0, 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 12.3 lbs would bring your BMI to 18.5, the start of the next category.
⬆️ Gaining approximately 12.3 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 adults 65 and older, BMI targets shift. Clinical guidelines (ESPEN, NIH) often recommend a slightly higher BMI range (around 23–26) for seniors to protect against bone loss and muscle decline. At 65 years old, a man at 6ft 4in and 140lbs has a BMI of 17.0.
Your BMI of 17.0 is within the standard range but sits near the lower end. Maintaining muscle mass through protein intake and light resistance training is particularly important at this age.
👉 Use our Senior BMI Calculator for age-stratified recommendations.
👉 Check our Asian BMI Calculator for ethnicity-specific guidelines (if applicable).
Health Analysis
Recommendations
General Health
A BMI of 17.0 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
Health Risks
With a BMI of 17.0 for a 6ft 4in man, the underweight 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.
Monitoring
At 6ft 4in, track your weight weekly. The healthy weight range for men at this height is 152-204lbs. Monitor waist circumference too—the CDC recommends below 40 inches.
Frequently Asked Questions
Am I at a healthy weight at 6ft 4in and 140lbs?
What health risks are associated with a BMI of 17.0 for a 6ft 4in man?
How common is a BMI of 17.0 for a 6ft 4in man?
How can a 6ft 4in man maintain a healthy weight?
Related Tools & Articles
💡 About this calculation: BMI = (140 × 703) ÷ (76 × 76) = 17.0 | Metric: 193.0 cm, 63.5 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: 2026-09-30