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At 5'1" and 100 lbs, your BMI is 18.9, placing you in the Normal category. A BMI of 18.9 falls in the healthy range (18.5 to 24.9). This is associated with the lowest risk of weight-related health complications.
18.9
BMI
Normal
Category
98-132
Healthy range (lbs)
In range
Weight status
BMI 18.9: Normal
| BMI | Category | Weight (lbs) | Your Status |
|---|---|---|---|
| Below 18.5 | Underweight | Below 98 lbs | - |
| 18.5 to 24.9 | Normal | 98 to 132 lbs | You are here |
| 25.0 to 29.9 | Overweight | 133 to 158 lbs | - |
| 30.0+ | Obese | Above 158 lbs | - |
Your BMI of 18.9 puts you in the Normal category for someone 5'1".
You are within the healthy weight range of 98 to 132 lbs for 5'1". Focus on body composition: maintaining or building lean mass while keeping body fat in a healthy range.
Keep in mind that BMI does not account for muscle mass. Two people at 5'1" and 100 lbs can have very different body compositions. Body fat percentage is a more precise indicator of health risk.
You are already in the healthy weight range at 100 lbs. The healthy BMI range (18.5 to 24.9) corresponds to 98 to 132 lbs for someone 5'1". 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.
For someone 5'1", the healthy weight range based on BMI is 98 to 132 lbs. At 98 lbs, BMI is 18.5 (lower boundary of healthy). At 132 lbs, BMI is 24.9 (upper boundary of healthy). Below 98 lbs is underweight; above 132 lbs is overweight.
BMI only uses height and weight. Body fat percentage measures actual fat tissue as a proportion of total weight, making it more precise for body composition assessment. Two people with the same BMI of 18.9 can have very different body fat percentages depending on muscle mass. Athletes often have BMI values above 25 while maintaining low body fat. Use body fat percentage to set specific fitness goals.
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 7-day trial.
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