EXTERIOR PROJECTS
Siding Calculator
Estimate exterior siding area, gables, whole packages, and material costs.
Preparing your calculator…
How this calculator works
Exterior wall area = rectangular perimeter × wall height. Add triangular gables: base × height ÷ 2 × gable count. Subtract standard opening allowances, apply waste, and round up packages using supplier coverage. One siding square is 100 sq ft.
Use current quotes, local rates, and measured dimensions to make this estimate useful for your situation.
Frequently asked questions
Are gables included?+
Yes. Enter the base and height of identical triangular gables and their count. Different gables can be estimated separately.
Does the cost include trim?+
No. Whole siding packages are priced, while corners, starter strips, channels, housewrap, delivery, and labor remain separate.