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Lumber Calculator
Estimate joists and stock boards for simple framing layouts.
Calculator inputs stay on this page.
Estimate only. Adjust inputs for your product and check local requirements before buying or building.
Constants status
Market start: United States
Profile: United States
The Home Depot deck framing guide: Supports the common 12, 16, or 24 in joist-spacing family. The calculator estimates pieces only and does not choose spans, loads, fasteners, or code-compliant assemblies. Verified 2026-09-03.
The Home Depot 2 x 6 x 12 ft lumber listing: Supports the 12 ft US stock board-length default. Actual dimensions and grade remain product-specific. Verified 2026-09-03.