To calculate the surface area of your sub box, you need to find the total amount of square inches on all six sides of the box.
Given the dimensions:
Height (h) = 14 inches
Width (w) = 14 inches
Depth (d) = 14 inches
The formula for the surface area of a rectangular box is:
Surface Area = 2*(hw + wd + h*d)
Substitute the values:
Surface Area = 2*(1414 + 1414 + 1414)
Surface Area = 2(196 + 196 + 196)
Surface Area = 2*(588)
Surface Area = 1176 square inches
So, your sub box has a surface area of 1176 square inches.