# Lumber Calc - slug: `lumber-calc` - url: https://lumber-calc.com - tagline: Free lumber, deck, and stair calculators - categories: calculators, utilities - locales: en - founded_case: false - ownership_status: unclaimed - editorial_status: approved - verification_status (legacy): unverified - link_rel (ops): nofollow - created_at: 2026-11-09 - updated_at: 2026-11-09 ## Description Lumber Calc is a set of free browser calculators for decks, stairs, lumber and roofs. It includes deck board, deck stair and baluster spacing calculators, a whole-deck planner, stair, landing and stringer layout tools, board foot, log board foot and board-foot-to-linear-foot converters, a cut list optimizer, fence, siding and stud estimators, and rafter length and roof pitch calculators. Each page shows a diagram, a code check against IRC and DCA 6 next to the result, and a printable shopping list. Lengths stay exact to 1/16 inch until display, imperial and metric are supported, projects can be saved, and inputs stay in the browser. ## Links for agents - HTML: /p/lumber-calc/ - Markdown: /p/lumber-calc.md - JSON: /api/v1/listings/lumber-calc.json