Deck Material Calculator
Estimate deck area, decking linear feet, board quantity and joist lines from dimensions and spacing.
Why use this deck material calculator?
Deck Material Calculator estimates surface area, linear decking, board count and an approximate joist-line count.
Example
Enter a 20 × 12 ft deck, 5.5-inch boards and 16-inch joist spacing to create a first material takeoff.
Important note
Structural member sizes, spans, footing design, fastening and local code are outside this quantity estimate.
How to use it
Start with the inputs shown above, review any options or assumptions, then generate the result. Where the tool creates a file, keep the original until you have opened and checked the downloaded output.
Frequently asked questions
Is this tool free?
Yes. The core tool is free to use.
Do I need an account?
No. You can use it without signing up.
Does it work on mobile?
Yes. Toolbox is designed for modern mobile and desktop browsers.