BMI Result: 4ft 11in, 91 lbs (BMI 18.4) - Female
According to CDC and WHO standards, a BMI of 18.4 is classified as Underweight.
A female who is 4ft 11in tall and weighs 91lbs has a BMI of 18.4, 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 4ft 11in: 92 lbs – 123 lbs
Metric: 149.9 cm, 41.3 kg
📏 Healthy waist circumference for your height: 30" – 35" (below 35" for female)
So you're 4ft 11in and weigh 91lbs. Your BMI is 18.4, 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 under 5ft 2in, waist-to-height ratio is particularly important. Research suggests that even at a normal BMI, a waist-to-height ratio above 0.5 may indicate increased health risks.
Weight & Threshold
Gaining approximately 0.5 lbs would bring your BMI to 18.5, the start of the next category.
⬆️ Gaining approximately 0.5 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 adults in early to middle adulthood (20-44), BMI is a reliable screening tool. At 36 years old, a woman at 4ft 11in and 91lbs has a BMI of 18.4, which falls into the Underweight category according to CDC and WHO standards.
Your BMI is below the healthy range. Consider consulting a healthcare provider for a nutritional assessment.
👉 Check your Healthy Weight Range for more context.
👉 Measure your Body Fat Percentage for a more complete picture.
Health Analysis
Recommendations
General Health
A BMI of 18.4 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.
Personalized Notes
Monitoring
At 4ft 11in, track your weight weekly. The healthy weight range for women at this height is 91-123lbs. Monitor waist circumference too—the CDC recommends below 35 inches.
Goals
For a woman at 4ft 11in, the CDC recommends a healthy weight range of 91-123lbs. At 91lbs, you're below this range. Consider setting a goal to gain 5-10% of your current weight over the next 3-6 months.
Frequently Asked Questions
What is the BMI for a 4ft 11in woman at 91lbs?
What else should I track besides BMI for a 4ft 11in woman?
How does a BMI of 18.4 affect health for a 4ft 11in woman?
What percentage of women have a BMI of 18.4 at 4ft 11in?
Related Tools & Articles
💡 About this calculation: BMI = (91 × 703) ÷ (59 × 59) = 18.4 | Metric: 149.9 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: 2026-07-08