Building tool
Deck Material Calculator
Estimate boards, joists, fasteners, and waste for a rectangular deck.
Runs in your browserEstimate
- Deck area
- 192 sq ft
- Board rows
- 26
- Decking needed
- 457.6 linear ft
- Joists
- 13
- Fasteners
- 744
Assumes straight boards across the deck width. Stairs, picture framing, beams, posts, and code requirements are separate.
How to use this deck material calculator
- Measure the project, enter the dimensions in the units shown, and add the waste, spacing, coverage, or material settings that apply.
- Review the calculated totals, units, and assumptions. Check the inputs and units before relying on the result.
- Change one input at a time to compare another case, then copy or save the result you plan to use.
About this deck material calculator
The Deck Material Calculator lets you estimate boards, joists, fasteners, and waste for a rectangular deck. The controls cover only the inputs needed for the result.
You can also use it to compare results after changing one input.
Example
For a 16-by-12-foot deck, enter the board face width, gap, joist spacing, and waste percentage to estimate decking and fasteners.
Common uses
- → estimate boards, joists, fasteners, and waste for a rectangular deck
- → compare results after changing one input
- → save an estimate for planning or comparison