Siding Calculator

Your details

The height of the wall face you are covering, from foundation to eave.
ft
The combined length of all wall runs you are siding. Add each elevation together.
ft
How many windows to subtract from the wall area.
A typical 3 x 4 ft window is 12 sq ft. Use an average for mixed sizes.
sq ft
How many doors to subtract. Count a single garage door as one large door.
A standard 3 x 7 ft entry door is 21 sq ft; a single garage door is about 63 sq ft.
sq ft
Extra material for cuts, trim, offcuts and breakage. 10% is typical; 15% for complex walls.
%
Optional. The exposed coverage of one panel so the count of panels can be shown. A vinyl lap panel covers roughly 14 sq ft. Leave at 0 to skip.
sq ft
Optional. How many panels come in a box or carton, used to round up to whole boxes. Leave at 0 to skip.
Currency
Squares to order
2.9
Net area (with waste)294 sq ft
Gross wall area360 sq ft
Gross wall area360
Openings removed93
Net (with waste)293.70000000000005

Order about 3 squares of siding for these walls.

  • Net coverage is the rectangular wall area plus any gable triangles, minus the window and door openings, with the waste allowance added on top.
  • A "square" is the siding trade unit of 100 sq ft of coverage; most siding is sold and priced by the square.
  • Subtracting openings keeps you from paying for siding you would only cut away; the waste allowance covers the offcuts you cannot reuse.

Next stepRound up to whole boxes or panels, and keep a spare bundle from the same batch for future repairs and color matching.

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