Imperial BMI Calculator
BMI Calculator in lbs & feet
Calculate your BMI using pounds, feet, and inches.
The imperial formula: BMI = (lbs × 703) ÷ in²
For Your Height
Status
Your Personalized Plan
BMI Prime
0.74–1.0 is normal
Ponderal Index
kg/m³
How You Compare
BMI Report
BMI:
Category:
Generated by BMIHero
Imperial BMI Formula Explained
BMI = (lbs × 703) ÷ in²
Step 1: Convert height to total inches (feet × 12 + inches).
Example: 5'9" = (5 × 12) + 9 = 69 inches
Step 2: Square your height in inches.
Example: 69 × 69 = 4,761 in²
Step 3: Multiply weight (lbs) by 703, then divide by in².
Example: (154 × 703) ÷ 4,761 = 108,262 ÷ 4,761 = BMI 22.7 (Normal weight)
The factor 703 is the conversion constant that adjusts for pounds and inches to match the metric formula result.
Quick Reference
BMI at Common Weights for 5'9" (175cm)
| Weight (lbs) | Weight (kg) | BMI | Category |
|---|---|---|---|
| 120 lbs | 54 kg | 17.7 | Underweight |
| 135 lbs | 61 kg | 19.9 | Normal |
| 150 lbs | 68 kg | 22.2 | Normal |
| 169 lbs | 77 kg | 25.0 | Overweight |
| 185 lbs | 84 kg | 27.4 | Overweight |
| 203 lbs | 92 kg | 30.0 | Obese |
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