BMI Result: 6ft 4in, 171 lbs (BMI 20.8) - Male
According to CDC and WHO standards, a BMI of 20.8 is classified as Normal.
A male who is 6ft 4in tall and weighs 171lbs has a BMI of 20.8, which falls into the Normal category used by the CDC and WHO for adults.
| Category | BMI Range |
|---|---|
| Underweight | < 18.5 |
| Normal | 18.5 – 24.9 |
| Obese | ≥ 30 |
Healthy weight range for 6ft 4in: 152 lbs – 205 lbs
Metric: 193.0 cm, 77.6 kg
📏 Healthy waist circumference for your height: 35" – 40" (below 40" for male)
So you're 6ft 4in and weigh 171lbs. Your BMI is 20.8, which falls into the Normal 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 in the 18.5-24.9 range is considered healthy by CDC and WHO standards. This range is associated with the lowest risk of cardiovascular disease and type 2 diabetes.
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 34.5 lbs would bring your BMI to 25, the start of the next category.
⬆️ Gaining approximately 34.5 lbs would put you in the Overweight BMI range.
⬇️ Losing approximately 18.9 lbs would bring you to the Underweight BMI threshold.
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 45-64, metabolic health becomes increasingly important. At 47 years old, a man at 6ft 4in and 171lbs has a BMI of 20.8, which falls into the Normal category.
For adults in this age range, maintaining stable weight and regular physical activity is key to preserving metabolic health.
👉 Calculate your Body Fat Percentage for a more complete health assessment.
👉 Try our Athlete BMI Calculator if you have higher muscle mass.
Health Analysis
Recommendations
General Health
A BMI of 20.8 is within the normal range defined by the CDC and WHO. Staying within this range is generally associated with lower rates of chronic conditions compared to higher or lower BMI categories.
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
Is 171lbs overweight for a 6ft 4in man?
How can a 6ft 4in man maintain a healthy weight?
What is the BMI for a 6ft 4in man at 171lbs?
What percentage of men have a BMI of 20.8 at 6ft 4in?
Related Tools & Articles
💡 About this calculation: BMI = (171 × 703) ÷ (76 × 76) = 20.8 | Metric: 193.0 cm, 77.6 kg
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Published: 2026-07-05