BMI Result: 6ft 8in, 139 lbs (BMI 15.3) - Female
According to CDC and WHO standards, a BMI of 15.3 is classified as Underweight.
A female who is 6ft 8in tall and weighs 139lbs has a BMI of 15.3, 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 8in: 168 lbs – 227 lbs
Metric: 203.2 cm, 63.0 kg
📏 Healthy waist circumference for your height: 30" – 35" (below 35" for female)
So you're 6ft 8in and weigh 139lbs. Your BMI is 15.3, 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 women over 5ft 11in, BMI may slightly underestimate body fat due to higher bone density. Muscle mass is also a factor—consider body fat percentage as a complementary measure.
Weight & Threshold
Gaining approximately 29.1 lbs would bring your BMI to 18.5, the start of the next category.
⬆️ Gaining approximately 29.1 lbs would put you in the Normal BMI range.
Waist & Health
The CDC recommends that non-pregnant women keep waist circumference below 35 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 12-year-old girl at 6ft 8in and 139lbs, a BMI of 15.3 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 15.3 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 females stay under 35 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
How common is a BMI of 15.3 for a 6ft 8in woman?
Is 139lbs overweight for a 6ft 8in woman?
How does a BMI of 15.3 affect health for a 6ft 8in woman?
What else should I track besides BMI for a 6ft 8in woman?
Related Tools & Articles
💡 About this calculation: BMI = (139 × 703) ÷ (80 × 80) = 15.3 | Metric: 203.2 cm, 63.0 kg
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Published: 2026-08-29