Calculate the exact number of deck boards needed for your deck project. Enter your deck dimensions and board width to get accurate material counts. Works for both wood and composite decking. Includes a waste factor for cuts and trimming.
Enter Your Measurements
Results
Boards Needed (with waste)
29
boards
Boards (exact)
26
boards
Deck Area
192
sq ft
Rows of Boards
26
rows
Deck Screws
480
screws
Formula
How to Use This Calculator
How to Use
- 1
Enter the deck length in feet (the direction boards will run).
- 2
Enter the deck width in feet (perpendicular to board direction).
- 3
Enter the board width in inches (5.5 in for standard 2x6, 5.25 in for composite).
- 4
Enter the board length available at your supplier.
- 5
Adjust the waste factor for angled or complex deck shapes.
Frequently Asked Questions
Frequently Asked Questions
What size deck boards should I use?
How much gap should I leave between deck boards?
Should deck boards run lengthwise or widthwise?
In-Depth Guides
Deck Building Guide: Materials, Cost & Calculator (2026)
Complete guide to planning and building a deck. Covers cost per square foot by material, joist spacing, ledger attachment, footings, railing requirements, and permit needs.
How Much Does It Cost to Build a Deck in 2026?
Deck building cost guide for 2026. Compare pressure-treated wood, composite, and Ipe decking by cost per square foot. Includes permit costs and contractor vs DIY savings.
Vinyl vs. Composite Decking: Which Is Better for Your Home?
A complete comparison of vinyl and composite decking — cost, appearance, maintenance, longevity, and how each compares to wood decking.
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About This Calculator
This calculator uses the formula: Rows = Deck Width ÷ (Board Width + Gap) × 12 | Total Boards = Rows × Boards per Row × Waste Factor. All calculations follow industry-standard methods. Results are estimates — always verify with a licensed professional for structural or code-compliant work.
Built and maintained by the CalcSmart team. Last updated March 2026.
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