Quick answer
Estimate deck-board rows, linear footage and purchase allowance from deck dimensions, board width and gap. Use the working RenoMetric calculator below for the actual estimate, then use this page to check assumptions, package rounding and project-specific considerations.
Open the working Deck calculator
Formula
Worked planning example
For a 12 ft wide deck, the number of board rows depends on the installed face width plus the planned gap between boards.
Common uses
- Wood decking
- Composite decking
- Platform decks
- Board replacement
How to get a better estimate
Measure the actual project rather than relying on listing dimensions. For irregular spaces, split the surface into simple measurable sections and add the results. Use the exact product label for package coverage, yield, density or square-foot coverage whenever it is available.
Keep waste and package rounding as separate steps. Waste covers cuts, breakage, pattern matching and unavoidable offcuts. Package rounding reflects the fact that many materials are sold only in complete bags, boxes, bundles or cans.
Before you buy: this page is a planning guide, not a contractor quotation or structural design. Verify final quantities with the product manufacturer, supplier or installer when project conditions could materially change the result.
Deck Board Calculator FAQ
Do I use nominal or actual board width?
Use the actual installed face width, not the nominal lumber name.
Why include the gap?
The repeated gap contributes to total deck width and affects the number of board rows.
Does this include picture-frame borders?
Not automatically. Borders and breaker boards should be added as separate measured components.