Stair Materials Calculator
Generate a complete stair materials list: stringers, treads, risers, screws, handrail, and balusters. Output as a printable shopping list.
How It Works
Enter basic stair dimensions (total rise, run per step, stair width, and whether you want risers and railing). The calculator generates a comprehensive shopping list with exact quantities for every component: stringer boards (2x12), treads, risers, construction adhesive, structural screws, stair stringer hangers, handrail, balusters, newel posts, and all associated hardware. Quantities include a standard 10% waste factor. The list is formatted for easy use at the lumber yard.
Frequently Asked Questions
How many 2x12 boards do I need for stringers?
You need one 2x12 board per stringer. For stairs up to 36" wide, use 3 stringers. Each board must be long enough for the stringer length (calculated from total rise and run). Common lengths are 10', 12', or 14' depending on your stair height.
What screws should I use for stair construction?
Use #9 or #10 structural screws (like GRK or SPAX) for attaching treads to stringers — typically 3" length. For stringer-to-framing connections, use 3.5" or longer structural screws or through-bolts. Avoid drywall screws, which are brittle.
How much extra material should I buy?
This calculator includes a 10% waste factor. For treads and risers, buy 1-2 extra pieces in case of cutting errors or defective boards. For pressure-treated lumber, buy extra since boards may be warped or damaged.