About Deck Board Calculator
Plan decking from deck dimensions, actual board width, gap, orientation and available stock length.
Inputs and calculations stay in your browser and require no signup.
How the calculation works
Planning calculation
Rows satisfy rows × board width + (rows − 1) × gap across the deck; each row is divided by stock length.
How to use this calculator
- 1Enter measured project dimensions and quantities.
- 2Adjust material, spacing, waste or density assumptions to match the project.
- 3Review the live planning quantities.
- 4Round purchasing quantities appropriately and confirm field conditions.
Understanding the result
The result distinguishes board-face coverage from the deck footprint and counts stock boards after waste.
Results use the units shown beside each field and output.
Important limitations
- Enter actual rather than nominal lumber width.
- Layouts with picture frames, diagonal boards, complex joints or mixed stock lengths need additional allowance.
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Frequently asked questions
Are gaps included?
Yes. The row calculation explicitly includes spacing between boards.
What does orientation change?
It swaps which deck dimension defines row length and which defines the number of rows.
Should I enter nominal width?
No. Use the board’s actual face width.
Use with
These tools support a practical next or previous step in the same workflow.
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