These calculators do the same math I did on scratch paper while planning my garage — minus the eraser marks. They give planning estimates; always confirm quantities against your plans and get local price quotes before ordering.
Garage cost estimator
Estimate the total cost of a detached garage by size, foundation, roofing, siding and finishes — and compare building it yourself with hiring out.
Garage Cost Estimator
Ballpark the total cost of a detached garage — DIY vs. hiring out.
Estimate
Want the story behind the numbers? Read what my garage cost and why contractors quoted so much more.
Wall framing lumber calculator
Studs, sill and top plates, OSB sheathing, anchor bolts and house wrap for four walls with door and window openings.
Wall Framing Lumber Calculator
Studs, plates, OSB sheets, anchor bolts and house wrap for the walls.
Estimate
Related: Wall Framing Basics · Assembling a Wall Frame
Concrete and block calculator
Cubic yards for a slab or a continuous footing, or blocks and grout for a fully grouted block stem wall like mine.
Concrete & Block Calculator
Cubic yards for slabs and footings, or blocks and grout for a block stem wall.
Estimate
Related: Foundation types compared · Pouring the foundation
Roof pitch and materials calculator
Rafter length, ridge height, truss count, roof sheathing, shingle bundles, underlayment and drip edge for a gable roof.
Roof Pitch & Materials Calculator
Rafter length, ridge height, trusses, sheathing and shingles for a gable roof.
Estimate
Related: Roof pitch, snow load and wind load · Roof sheathing and roofing
These are estimates
Calculators can’t see your site, your plans or your local prices. Use them for budgeting and planning, add a waste factor, and verify everything against your approved plans before ordering materials.