Garden Shed Materials Calculator
Calculate lumber, roofing, siding, and hardware to build a garden shed.
Get a full materials list with quantities and standard dimensions by shed size.
Building a garden shed requires careful planning of materials. The exact quantities depend on the shed size, wall height, roof style, and material choices.
Basic shed structure components:
- Floor frame: Pressure-treated 2×6 joists spaced 16 inches on center, plus 3/4-inch plywood subfloor
- Wall framing: 2×4 studs spaced 16 inches on center, with top and bottom plates
- Roof framing: 2×4 or 2×6 rafters depending on span, spaced 24 inches on center
- Sheathing: 1/2-inch OSB or plywood for walls and roof
- Roofing: Asphalt shingles over tar paper/underlayment
- Siding: T1-11 panels, lap siding, or board and batten
Estimating lumber:
- Floor joists: (Width in feet / 1.33) + 1 joists, each the length of the shed
- Wall studs: Perimeter in feet × 0.75 studs per foot (16" OC) + extras for corners and openings
- Roof rafters: (Length in feet / 2) + 1 rafters, with appropriate overhang
Roof area depends on pitch. A standard 4/12 pitch multiplier is 1.054. A 6/12 pitch multiplier is 1.118.
Additional materials include nails, screws, hurricane ties, door hardware, drip edge, and paint or stain.
Waste factor: Always add 10-15% extra material for cuts, waste, and mistakes. This calculator includes a 10% waste factor in all estimates.
How we build and check this calculator
This calculator runs entirely in your browser, so the numbers you enter stay on your device. The math behind it is written by hand and tested against worked examples and standard references before the page goes live.
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