DIY Shed Cost Calculator

What Is a DIY Shed Cost Calculator?

A DIY shed cost calculator estimates the materials cost to build a backyard storage shed, garden shed, or lean-to structure. Enter shed dimensions, roof type, and price per square foot or square meter for flooring, walls, and roofing. The tool calculates floor area, wall area, roof area, rafter span, and total estimated cost.

Area and Cost Formulas

Floor area:

$$ A_f = L \times W $$

Wall area:

$$ A_w = 2(L + W) \times H + W \times R \times c $$

Where $c = 0$ for flat roofs and $c = 1$ for slanted or gable roofs. $R$ is the roof rise above the wall height.

Total cost:

$$ \text{Cost} = A_f P_f + A_w P_w + A_r P_r $$

$P_f$, $P_w$, and $P_r$ are your material prices per unit area for floor, walls, and roof. Roof area and rafter span depend on roof type (flat, slanted, or gable) and overhang length.

Roof Types Supported

• Flat roof: Simple single-slope or flat-top shed with no gable triangle.
• Slanted / lean-to: One-direction slope, ideal for lean-to sheds against a wall.
• Gable roof: Classic peaked roof with two sloped sides.

For lumber and framing estimates, see our Board and Batten Calculator and Concrete Calculator if you plan a slab foundation.