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Deck Board Calculator
Estimate deck board rows and board count with waste allowance.
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
Trex decking product guide: Supports common composite deck board dimensions: 5.5 in / 140 mm board width and 12/16/20 ft product lengths. Board dimensions remain visible product inputs. Verified 2026-09-03.
Trex deck board spacing guide: Supports the default deck board gap of 3/16 in, represented as 0.1875 in or 5 mm. Users should still follow the specific manufacturer guide for their material. Verified 2026-09-03.