Estimated result
Enter measurements and select Calculate.
Wall, gable, and package model
Wall areas are summed, openings are subtracted without going below zero, and optional triangular gable area is added. Allowance produces adjusted area; one siding square is 100 square feet.
Coverage boundary
Package count uses only coverage entered by the user. The calculator does not estimate trim, starter strip, flashing, fasteners, labor, overlap, wind loading, or manufacturer requirements.
Worked example
The editable example values above demonstrate the formula and show every planning assumption used in the result.
Related calculators
This browser-local tool provides a planning estimate, not a purchase guarantee, supplier quote, structural design, engineering specification, permit decision, or code approval.