BMI Result: 5ft 1in, 91 lbs (BMI 17.2) - Male
According to CDC and WHO standards, a BMI of 17.2 is classified as Underweight.
A male who is 5ft 1in tall and weighs 91lbs has a BMI of 17.2, 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 1in: 98 lbs – 132 lbs
Metric: 154.9 cm, 41.3 kg
📏 Healthy waist circumference for your height: 35" – 40" (below 40" for male)
So you're 5ft 1in and weigh 91lbs. Your BMI is 17.2, 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 under 5ft 5in, abdominal fat is a key health indicator. Even with a normal BMI, excess belly fat can increase cardiovascular risk.
Weight & Threshold
Gaining approximately 6.9 lbs would bring your BMI to 18.5, the start of the next category.
⬆️ Gaining approximately 6.9 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
For adults 45-64, metabolic health becomes increasingly important. At 46 years old, a man at 5ft 1in and 91lbs has a BMI of 17.2, which falls into the Underweight 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 17.2 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
Monitoring
At 5ft 1in, track your weight weekly. The healthy weight range for men at this height is 97-131lbs. Monitor waist circumference too—the CDC recommends below 40 inches.
Diet & Nutrition
At 5ft 1in and 91lbs, a BMI of 17.2 indicates underweight. For men of this height, the CDC recommends a healthy weight range of 97-131lbs. Focus on protein-rich foods and resistance training to build muscle mass.
Frequently Asked Questions
How can a 5ft 1in man maintain a healthy weight?
Am I at a healthy weight at 5ft 1in and 91lbs?
What is the BMI for a 5ft 1in man at 91lbs?
How does a BMI of 17.2 affect health for a 5ft 1in man?
Related Tools & Articles
💡 About this calculation: BMI = (91 × 703) ÷ (61 × 61) = 17.2 | Metric: 154.9 cm, 41.3 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: 2026-07-15