BMI Result: 5ft 8in, 103 lbs (BMI 15.7) - Male
According to CDC and WHO standards, a BMI of 15.7 is classified as Underweight.
A male who is 5ft 8in tall and weighs 103lbs has a BMI of 15.7, 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 8in: 122 lbs – 164 lbs
Metric: 172.7 cm, 46.7 kg
📏 Healthy waist circumference for your height: 35" – 40" (below 40" for male)
So you're 5ft 8in and weigh 103lbs. Your BMI is 15.7, which falls into the Underweight category according to CDC and WHO standards. Let's break down what this means for your health.
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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 18.4 lbs would bring your BMI to 18.5, the start of the next category.
⬆️ Gaining approximately 18.4 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 65 and older, BMI targets shift. Clinical guidelines (ESPEN, NIH) often recommend a slightly higher BMI range (around 23–26) for seniors to protect against bone loss and muscle decline. At 67 years old, a man at 5ft 8in and 103lbs has a BMI of 15.7.
Your BMI of 15.7 is within the standard range but sits near the lower end. Maintaining muscle mass through protein intake and light resistance training is particularly important at this age.
👉 Use our Senior BMI Calculator for age-stratified recommendations.
👉 Check our Asian BMI Calculator for ethnicity-specific guidelines (if applicable).
Health Analysis
Recommendations
General Health
A BMI of 15.7 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.
Frequently Asked Questions
Am I at a healthy weight at 5ft 8in and 103lbs?
How can a 5ft 8in man maintain a healthy weight?
What health risks are associated with a BMI of 15.7 for a 5ft 8in man?
How common is a BMI of 15.7 for a 5ft 8in man?
Related Tools & Articles
💡 About this calculation: BMI = (103 × 703) ÷ (68 × 68) = 15.7 | Metric: 172.7 cm, 46.7 kg
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Published: 2026-08-26