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Deck board calculator

Estimate boards for an outdoor wooden deck from its rectangular size, board width, gap, stock length and support spacing. Add waste and an optional board price.

Planning estimate only. Assumes a rectangular deck and a simple repeating layout. It does not design framing, foundations, stairs, guards, drainage, code compliance or safe construction. Board-end joints must land on suitable supports; the count does not produce a cut map or verify joint support. Check product instructions and local rules with a qualified builder.

How many deck boards do I need?

For an outdoor wooden deck, enter the length along the board direction and the width across it. Add the actual board width, gap, stock-board length and joist spacing from your plan. The estimate counts rows, approximate stock boards, support lines and fasteners.

Frequently asked questions

How many deck boards do I need?

For an outdoor wooden deck, enter the length along the board direction and the width across it. Add the actual board width, gap, stock-board length and joist spacing from your plan. The estimate counts rows, approximate stock boards, support lines and fasteners.

Are my deck measurements uploaded?

No. This estimate runs in your browser and does not send your measurements to a server.

What if my stock boards are shorter than the deck?

The estimate includes multiple pieces per row in its total linear-material count. It reports approximate end joints, but does not create a cut layout or confirm that each joint lands on adequate framing. Plan and support every joint before buying.

Does this calculator tell me how to build a safe deck?

No. It estimates surface boards and a simplified fastener count only. Joists, beams, posts, foundations, loads, guards, stairs, permits and local building rules require a separate design and qualified review.