Deck Board Calculator
Estimate deck board quantity based on board width, length, and gap spacing. Accounts for cut waste and rip factors.
Frequently Asked Questions
How many deck boards for a 12x12 deck?
A 12x12 deck with 5.5 inch wide boards needs about 28 boards at 12 feet long, plus 10% for cuts.
What size deck board is most common?
5/4 by 6 inch (actual 1 by 5.5 inches) is standard for pressure-treated and composite decking.
How do I reduce deck board waste?
Plan board runs to match joist spacing. Order boards 2 feet longer than deck length to minimize butt joints.