How to calculate bs of box?

To calculate the box's base surface area (bs), you need to find the area of the bottom face of the box. For a rectangular box, this is done by multiplying the length (L) by the width (W): ( \text{bs} = L \times W ). For a square box, simply square the length of one side: ( \text{bs} = L^2 ). Ensure all measurements are in the same unit for accurate results.