Deck Project Summary
Fill in your deck once and get one combined bill of materials for boards, joists, fasteners, and footing concrete — instead of running four separate calculators and copying numbers between them.
1. Deck & boards
2. Joists
Joists are assumed to run perpendicular to the deck boards, distributed along the same dimension the boards run.
3. Fasteners
Board rows (26) and joist count (13) are carried over automatically from sections 1 and 2 above — no re-entry needed.
4. Footings
Below grade. Confirm against your local frost-depth requirement -- this tool does not know your jurisdiction.
80lb ~0.6, 60lb ~0.45, 50lb ~0.375 cu ft. Use the value on your product.
Applied to boards, joists, fasteners, and concrete below. Change it and every section updates together.
Combined bill of materials
| Category | Item | Quantity | Unit | Note |
|---|---|---|---|---|
| Decking | Deck boards to purchase | 29 | boards | includes waste |
| Decking | Board rows | 26 | rows | |
| Framing | Joists | 13 | joists | |
| Fasteners | Deck screws (incl. waste) | 744 | screws | |
| Fasteners | Screw boxes | 3 | boxes | |
| Footings | Concrete bags (incl. waste) | 26 | bags |
Railing is not included above
A safe railing estimate depends on which sides need railing and where stairs or doors interrupt it, which this summary does not collect. Use the Deck Railing Calculator separately and add its output to this list by hand.
This is a combined material-quantity estimate only
It does not evaluate structural safety, span tables, footing/frost design, or local code compliance. See our methodology for formulas and assumptions, and confirm requirements with your local building department before ordering.
How this is different from the standalone calculators
- Enter your deck dimensions and board settings once, in section 1.
- Set joist spacing in section 2 — the run and span are derived from the same deck dimensions your boards use, the same way "Use my deck project" does on the standalone Joist Calculator.
- Choose your fastener system in section 3. Board rows and joist count feed in automatically; you never re-type them.
- Add footing count, shape, and depth in section 4.
- Review one combined bill of materials below, export it as a CSV, print it, or save the deck & joist inputs to your project.
Every number here is checkable
Limitations
Railing is intentionally left out of the combined total (see the notice above the bill of materials). Share links carry every input on this page — deck dimensions, joist spacing, fastener system, and footing choices — so anyone who opens a shared link sees the same combined bill of materials you did.
Frequently asked questions
Methodology & review
This page estimates material quantities only, by combining the same transparent formulas used on each standalone calculator. It does not evaluate structural safety or local code compliance. See our methodology for assumptions and rounding rules. Last reviewed: August 14, 2026.