calcs.homes
calcs.homes
Enter your home's perimeter and wall height to get exterior siding coverage and estimated cost, minus your windows and doors.
Estimate only — includes 10% waste for cuts and overlap.
Gross wall area is perimeter times wall height. Subtract your window and door area to get net area, then add 10% for waste. Siding is sold in "squares" — one square covers 100 sq ft — so US results divide net area by 100; metric siding is typically sold and priced by the square meter directly.
A square is a roofing and siding industry unit equal to 100 square feet of coverage — it's how most US suppliers price and package siding.
For a precise estimate, add up the area of all windows and doors and enter the total. For a rough estimate, many contractors just add 10-15% waste and skip the subtraction — either approach works with this calculator.