Phone:
(701)814-6992
Physical address:
6296 Donnelly Plaza
Ratkeville, Bahamas.
Deck Board Calculator
Plan your project efficiently using our deck board calculator with spacing precision. Instantly determine the deck board calculator square feet coverage and material counts for straight or diagonal layouts.
Deck Dimensions
4ft50ft
4ft50ft
Board Width
Configuration
Logic includes standard 1/8" to 1/4" spacing.
Material Needed
Total Linear Feet
0 ft
12ft Boards
0
16ft Boards
0
Total Area:
0 sq. ft.
*Includes 10% waste factor for cuts.
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How It Works
1
Measure Deck
Enter the overall width and length of your framing area in feet.
2
Select Board
Choose your material width. Standard decking is usually 5.5 inches wide.
3
Get Count
We calculate the linear footage needed, including a buffer for waste and spacing.
Deck Board Calculator Formula
Wondering how the math works? Our Deck Board Calculator formula calculates the effective coverage of every plank.
Total Linear Feet = (Deck Area in Sq Ft) / (Board Width in Ft + Spacing in Ft)
This formula ensures that the gap between boards (usually 1/8" to 1/4") is accounted for, preventing you from over-ordering material.
Diagonal vs. Straight Lay
Straight Lay: The most efficient use of material. We apply a standard 10% waste factor for cutoffs and errors.
Diagonal Deck Board Calculator: When laying decking at a 45° angle, every board end must be cut at an angle, creating significant scrap. Our calculator automatically increases the waste factor to 15% to ensure you have enough coverage.
User Reviews
4.8 (115 Reviews)
"Spot on. I ordered exactly what the calculator said for my 16x20 deck and had just 2 boards left over."
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Mike T."The diagonal waste factor is very accurate. I almost didn't order enough until I clicked that option."
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Sarah Jenkins"Simple and fast. Would love a price estimator built in, but for quantities it is perfect."
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Jason R."I used this for a composite project (Trex) and the 5.25 inch setting was super helpful."
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Dave P."Saved me a trip back to the lumber yard. Don't guess, just use this."
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Amanda L."Works great for rectangles. I had to do some manual math for my octagon deck, but still useful."
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Robert K."The 16ft board count estimate helped me rent the right size trailer."
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Tom H."Very clean design. Easy to use on my phone while standing in the backyard."
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Lisa M."I like that it separates linear feet from the board count. Gives me options when buying."
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Brian W.Frequently Asked Questions
What size gap should I leave between boards?
For pressure-treated wood, a 1/8 inch gap (about the size of an 8d nail) is standard as the wood will shrink as it dries. For composite decking, follow the manufacturer's instructions, typically 1/4 inch, to allow for expansion.
Does this calculator account for joist spacing?
No, this calculator determines the surface decking only. Joist spacing (typically 16" on center) determines the structural frame underneath but does not significantly change the amount of decking needed.
Should I buy 12ft or 16ft boards?
Choose the length that minimizes seams. If your deck is 12ft wide, buy 12ft boards. If it is 20ft wide, use 20ft boards or stagger 12ft and 8ft boards to avoid a single line of joints.
Why does diagonal decking require more material?
Laying boards at a 45-degree angle creates triangular cut-offs at both ends of every board. These small pieces are often too short to reuse, resulting in higher waste (typically 15-20%).
How much should I order for waste?
A general rule is 10% for simple, straight patterns and 15% for diagonal patterns or complex shapes. This covers cutting errors and bad spots in the lumber.
What is nominal vs. actual size?
"Nominal" is the name of the board (e.g., 1x6), while "Actual" is the physical size after drying and planing (e.g., 5.5 inches). Always use actual dimensions for calculations.