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At 5'4" and 100 lbs, your BMI is 17.2, placing you in the Underweight category. A BMI of 17.2 falls in the underweight range (below 18.5). This may indicate insufficient body mass for your height. Consulting a healthcare provider is recommended.
17.2
BMI
Underweight
Category
108-145
Healthy range (lbs)
+8 lbs
To healthy low
BMI 17.2: Underweight
| BMI | Category | Weight (lbs) | Your Status |
|---|---|---|---|
| Below 18.5 | Underweight | Below 108 lbs | You are here |
| 18.5 to 24.9 | Normal | 108 to 145 lbs | Goal range |
| 25.0 to 29.9 | Overweight | 146 to 174 lbs | - |
| 30.0+ | Obese | Above 174 lbs | - |
Your BMI of 17.2 puts you in the Underweight category for someone 5'4".
To reach the lower boundary of the healthy range (108 lbs), you would need to gain approximately 8 lbs. A safe rate of weight gain is 0.5 to 1 lb per week through a calorie surplus combined with resistance training to prioritize lean mass.
Keep in mind that BMI does not account for muscle mass. Two people at 5'4" and 100 lbs can have very different body compositions. Body fat percentage is a more precise indicator of health risk.
FitCommit uses AI body scanning to estimate your actual body fat percentage, not just weight-to-height ratio. See your lean mass, fat mass, and a 12-month transformation preview. 60-second phone scan, no equipment needed.
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A healthy weight for someone 5'4" is between 108 and 145 lbs, based on a BMI of 18.5 to 24.9. This range reflects the weights most associated with reduced risk of chronic disease. Individual factors like muscle mass, frame size, and body fat distribution also matter.
A BMI of 17.2 falls in the Underweight range. A BMI of 17.2 falls in the underweight range (below 18.5). This may indicate insufficient body mass for your height. Consulting a healthcare provider is recommended. BMI is a population-level screening tool, not a diagnostic measure. Factors like waist circumference, body fat percentage, blood pressure, and cholesterol provide a more complete picture of metabolic health.
You would need to gain approximately 8 lbs to reach the low end of the healthy range. The healthy BMI range (18.5 to 24.9) corresponds to 108 to 145 lbs for someone 5'4". A sustainable rate of weight loss is 0.5 to 1 lb per week through a calorie deficit of 250 to 500 calories per day.
BMI is a useful screening tool but has real limitations. It does not distinguish between muscle and fat, so muscular athletes often show elevated BMI despite low body fat. It also does not account for where fat is stored. Waist-to-height ratio and body fat percentage are more precise measures. Use BMI as a starting point, not a definitive health verdict.
To reach low end (108 lbs)
8 lbs to gain
To reach high end (145 lbs)
45 lbs to gain
BMI tells you where you are. FitCommit shows you what to do about it. AI body scanning estimates your body fat percentage and lean mass. Food camera scanning tracks your nutrition automatically. Free 1-month trial.
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