The BMI Metric to Imperial Converter converts body measurements between metric (kg, cm) and imperial (lbs, feet/inches) and calculates BMI in either unit system. Essential when your scale reads pounds but your doctor uses kilograms — or when comparing health data across different countries.
22.9
154.3
lb
68.9
in
5.74
ft
2
56.7
kg
76.3
kg
124.9
lb
168.1
lb
-13.3
kg
6.3
kg
22.9
154.3
lb
68.9
in
5.74
ft
2
56.7
kg
76.3
kg
124.9
lb
168.1
lb
-13.3
kg
6.3
kg
The US uses pounds and inches for body measurements; the rest of the world uses kilograms and centimeters. When your gym app reports weight in kg, your doctor enters height in cm, or you're reading a clinical trial that used metric units, you need a reliable conversion that also feeds into the correct BMI formula. The BMI metric to imperial converter handles both the unit conversion and the BMI calculation in one step.
Metric formula: BMI = weight (kg) ÷ height² (m²)
Imperial formula: BMI = 703 × weight (lbs) ÷ height² (inches²)
The constant 703 converts from lbs/in² to kg/m² — the two formulas produce identical BMI results when you input the same physical measurement. Example: 154 lbs = 69.9 kg; 5'7" = 67 inches = 170.2 cm. Metric BMI = 69.9/1.702² = 24.1. Imperial BMI = 703 × 154/67² = 703 × 154/4489 = 24.1. ✓
Use this online calculator to convert and compute in either system. The BMI calculator for women and BMI calculator for men provide sex-specific health context for your result.
Quick conversion table for BMI-relevant measurements:
Minor discrepancies between BMI calculators usually come from rounding in the unit conversion step. If one app rounds 154 lbs to 70 kg (instead of the exact 69.85 kg) before applying the metric formula, the BMI will differ by 0.1–0.2 units — clinically insignificant but noticeable. For maximum precision: use the native formula for whichever units your measuring instruments provide, without converting first. If your scale reads in lbs and your height is measured in inches, use the imperial formula directly rather than converting to metric first.
The ideal weight calculator, waist-to-hip ratio calculator, and health converters complete your body measurement toolkit.
BMI is a screening tool, not a diagnostic measure. A BMI of 22-25 is typically considered optimal for most adults. The category number provides a quick reference: 1 = Underweight, 2 = Normal, 3 = Overweight, 4 = Obese. Consult a healthcare provider for personalized health assessment.
Inputs
Results
70 kg at 175 cm = BMI 22.9 (Normal)
Inputs
Results
95 kg at 180 cm = BMI 29.3 (Overweight)
How helpful was this calculator?
Be the first to rate!
