Gable ends.
Calculate the square footage of a triangle.
Enter only the actual height and the actual width.
DO NOT add 1 to the height or enter half the width.
Allow the computer to do it for you.

This section will calculate the number of squares of siding you will need
based on the information you have entered above.

To complete the estimate for siding material, all surface area calculations are added, then 10% is added to allow for waste, then the final figure is divided by 100 to get the number of squares of siding needed.

Wall surface area + Gable Ends surface area + Gambrel surface area + Dormer surface area ============================= Number of squares of siding needed