Shed exterior material math
Shed Siding Calculator
Estimate siding square footage, 4×8 sheet count, lap siding boards, battens, trim, fasteners, waste, and rough material cost for a shed.
How to use the shed siding calculator
- Enter the shed width, length, wall height, and gable height.
- Subtract the main door and window areas.
- Choose sheet siding, lap siding, or board-and-batten planning.
- Adjust waste and prices to create a first-pass shopping list.
The calculator starts with the four wall faces, adds triangular gable area when entered, subtracts openings, then adds waste before converting the result into common siding materials.
Shed siding example
A 10×12 shed with 8 ft walls, two 2 ft gables, a 35 sq ft door, and 12 sq ft of windows needs roughly 358 sq ft of siding after a 10% waste allowance. With 4×8 sheet siding, that rounds to about 12 sheets.
FAQ
How many 4×8 siding sheets are needed for a 10×12 shed?
For a typical 10×12 shed with 8 ft walls and small gables, plan around 11 to 13 sheets after subtracting a door and window area and adding waste. The exact count depends on roof shape, openings, and cuts.
Does this calculator work for T1-11 siding?
Yes. Use the sheet siding option and keep sheet coverage at 32 sq ft for a standard 4×8 panel, unless your product has a different exposed coverage.
How much waste should I add for shed siding?
Use at least 10% for a simple rectangular shed. Add more for many openings, angled cuts, board-and-batten patterns, or if you want spare material for repairs.
Does siding area include trim?
The siding square footage is separate from trim. The calculator adds a simple trim-board estimate for corners, doors, windows, and gable edges.