it is that simple. It is a base number.Pounds and inches Formula: weight (lb) / [height (in)]2 x 703Calculation: [weight (lb) / height (in) / height (in)] x 703Calculate BMI by dividing weight in pounds (lbs) by height in inches (in) squared and multiplying by a conversion factor of 703.Example: Weight = 150 lbs, Height = 5’5” (65")Calculation: [150 ÷ (65)2] x 703 = 24.96