How to Convert Weight and Height for BMI Calculation

Body Mass Index (BMI) is a simple screening tool used to categorize weight status. The standard formula for BMI uses Metric Units.

BMI = kg / m²

(Weight in Kilograms divided by Height in Meters squared).

If You Know Your Stats in Imperial (Lbs/Feet)

If you are in the US, you probably know you weigh "180 lbs" and stand "5'11". You cannot plug these into the standard formula directly.

Step 1: Convert Weight

Go from Pounds to Kilograms. 180 lbs / 2.2046 = 81.65 kg. Use Lbs to Kg Tool

Step 2: Convert Height

Go from Feet to Meters. 5' 11" is approximately 71 inches. 71 inches * 0.0254 = 1.80 meters. Use Feet to Meters Tool

Step 3: Calculate

81.65 / (1.80 * 1.80) = 25.2 BMI.

Accuracy Matters

Because BMI squares your height, a small error in height conversion makes a big difference in the final score. Always use a precise converter rather than guessing.