Siding calculator

Rips, gables, and a story break. 10% is a planning start for a simple house. A house with a lot of gables needs more.

Job sheet

Plumb siding job sheet

1,400 sq ft net.

  • Squares15.4100 sq ft per square, after the allowance.
Plumb siding job sheet
1,400 sq ft net.

Squares: 15.4 (100 sq ft per square, after the allowance.)

Measure each wall, length times height, and add them. Subtract windows and doors you are not covering. Divide by 100. That is the square count before waste. Insulation behind the siding is insulation. The wall area itself can be built on square feet.

FAQ

What is a square of siding?

100 square feet of wall after you remove windows and doors, then after the waste you add for cuts. A 1,600 square foot wall minus 200 square feet of openings is 1,400. Ten percent is 1,540 square feet, 15.4 squares.

Does vinyl need its own page?

No. Vinyl, fiber cement, and wood laps are all ordered from net area. The piece count depends on the exposure printed on that product. Squares stay the same.

Sources

  1. NIST Handbook 44: 100 square feet is one square. The same unit roofers use.