Deck Board Calculator
Enter deck dimensions, board width, and board length to get an exact count of deck boards, pounds of screws, and full material cost. Works for 5/4×6, 2×6, composite Trex, and other board sizes.
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Top Pick5/4×6 Pressure Treated Decking — Home Depotfrom $2.29/lin ft* Affiliate links — we may earn a commission at no cost to you.
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How to Use This Calculator
- 1Enter your measurements in the fields above. Use the units shown next to each field (ft, in, etc.).
- 2Click Calculate to get your material estimate instantly.
- 3Review the highlighted result — it shows the key quantity you need to order.
- 4Use Copy Results to save your estimate, or bookmark the URL — your inputs are encoded in the link.
Pro tip: Always add 10% to your material order to account for waste, cuts, and defects.
Frequently Asked Questions
How many deck boards do I need for a 12×16 deck?
A 12×16 deck using 5/4×6 boards (5.5" wide) with 1/4" gaps needs about 26 rows across 12 ft. With 16 ft boards, that's 26 boards plus 10% waste = approximately 29 boards.
Should I use 5/4×6 or 2×6 for deck boards?
5/4×6 (actual 1"×5.5") is lighter, cheaper, and the most common choice for residential decks with joists at 16" OC. Use 2×6 (1.5"×5.5") if joists are at 24" OC or for heavier-use commercial decks.