BMI Result: 5ft 9in, 109 lbs (BMI 16.1) - Male
According to CDC and WHO standards, a BMI of 16.1 is classified as Underweight.
A male who is 5ft 9in tall and weighs 109lbs has a BMI of 16.1, 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 5ft 9in: 125 lbs – 169 lbs
Metric: 175.3 cm, 49.4 kg
📏 Healthy waist circumference for your height: 35" – 40" (below 40" for male)
So you're 5ft 9in and weigh 109lbs. Your BMI is 16.1, 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 of average height, BMI is a reliable screening tool. The CDC recommends keeping waist circumference below 40 inches to minimize health risks.
Weight & Threshold
Gaining approximately 16.3 lbs would bring your BMI to 18.5, the start of the next category.
⬆️ Gaining approximately 16.3 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 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 17-year-old boy at 5ft 9in and 109lbs, a BMI of 16.1 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 16.1 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 16.1 for a 5ft 9in 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.
Diet & Nutrition
At 5ft 9in and 109lbs, a BMI of 16.1 indicates underweight. For men of this height, the CDC recommends a healthy weight range of 125-168lbs. Focus on protein-rich foods and resistance training to build muscle mass.
Frequently Asked Questions
Is 109lbs overweight for a 5ft 9in man?
What else should I track besides BMI for a 5ft 9in man?
What health risks are associated with a BMI of 16.1 for a 5ft 9in man?
How do I calculate my BMI at 5ft 9in and 109lbs?
Related Tools & Articles
💡 About this calculation: BMI = (109 × 703) ÷ (69 × 69) = 16.1 | Metric: 175.3 cm, 49.4 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: 2026-08-20