Most BMI calculators online ask for your weight in kilograms and height in centimeters. If you think in feet, inches, and pounds — like most people in the US and UK — you end up doing a unit conversion just to use the calculator.

The BMI calculator at Ultimate Tools accepts imperial units directly: feet, inches, and pounds. No conversion step.

Calculate your BMI in imperial units: BMI Calculator — Feet, Inches, Pounds

The Imperial BMI Formula

For those who want to understand the math:

BMI = (weight in pounds × 703) ÷ (height in inches)²

Example: 5'9" (69 inches), 160 lbs

BMI = (160 × 703) ÷ (69²) = 112,480 ÷ 4,761 = 23.6

The 703 factor is the conversion constant that makes the imperial formula produce the same BMI values as the metric formula.

How to Use the Calculator

Go to the BMI Calculator

Select Imperial units

Enter your height in feet and inches (e.g., 5 ft 9 in)

Enter your weight in pounds

Click Calculate — your BMI and category appear instantly

BMI Categories (Same Regardless of…