BMI Result: 5ft 1in, 100 lbs (BMI 18.9) - Male
According to CDC and WHO standards, a BMI of 18.9 is classified as Normal.
A male who is 5ft 1in tall and weighs 100lbs has a BMI of 18.9, 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 5ft 1in: 98 lbs – 132 lbs
Metric: 154.9 cm, 45.4 kg
📏 Healthy waist circumference for your height: 35" – 40" (below 40" for male)
So you're 5ft 1in and weigh 100lbs. Your BMI is 18.9, which falls into the Normal category according to CDC and WHO standards. Let's break down what this means for your health.
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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 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 32.3 lbs would bring your BMI to 25, the start of the next category.
⬆️ Gaining approximately 32.3 lbs would put you in the Overweight BMI range.
⬇️ Losing approximately 2.1 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 61 years old, a man at 5ft 1in and 100lbs has a BMI of 18.9, 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 18.9 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.
Personalized Notes
Health Risks
With a BMI of 18.9 for a 5ft 1in man, the normal range is associated with the lowest risk of cardiovascular disease and type 2 diabetes. Men in this range have a 40% lower risk of developing type 2 diabetes compared to those with a BMI over 25.
Goals
For a man at 5ft 1in, the CDC recommends a healthy weight range of 97-131lbs. At 100lbs, you're well within this range. Focus on maintaining your current weight through consistent healthy habits.
Frequently Asked Questions
Is 100lbs overweight for a 5ft 1in man?
How can a 5ft 1in man maintain a healthy weight?
How does a BMI of 18.9 affect health for a 5ft 1in man?
How common is a BMI of 18.9 for a 5ft 1in man?
Related Tools & Articles
💡 About this calculation: BMI = (100 × 703) ÷ (61 × 61) = 18.9 | Metric: 154.9 cm, 45.4 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: 2026-07-15