🪥 Deck Board Estimator

Get exact board counts and calculate fasteners for any sized deck layout.

Total Boards Required

Deck Boards

Total Deck Area: 0 Sq. Ft

Deck Screws Needed: 0 Screws

* Assumes standard 5.5" wide decking boards with Â¼" spacing, and 16" on-center joists for screw counts. Includes 10% waste.

📏 Deck Surface Math

Deck boards are usually estimated in Linear Feet and then converted into actual piece counts based on the board lengths available at your lumber yard.

      Total Boards = CEIL(((SqFt / (5.75 / 12)) / Board Length) x 1.10)
    

The Gap Multiplier: We assume standard 5.5" wide decking (wood or composite) with a 1/4" gap for drainage and expansion. This makes each "course" of boards 5.75" wide.
Screw Counts: For 16" on-center (OC) joists, you should expect to use roughly 3.5 screws per square foot. This accounts for 2 screws at every joist intersection.
Lumber Matching: Whenever possible, buy the board length that matches your deck's longest dimension to minimize "butt joints" which are the first places a deck will rot or fail.

💡 Expert Tip

If your deck is 16 feet wide, buy 16-foot boards even if 8-foot boards are cheaper per foot. A deck with continuous boards looks much more professional and will have fewer water penetration points on the joists below.

💵 Decking Material Pricing Guide per Linear Foot (2026 Averages)

Understanding typical material and installation costs is key to planning a successful contracting project. Below are regional averages for cost planning.

Material Type	Avg. Cost / Linear Foot	Estimated Lifespan	Maintenance Requirements
Pressure-Treated Wood	$1.50 - $2.50	10 - 15 Years	Annual staining, sealing & power washing
Western Red Cedar	$3.50 - $5.50	15 - 20 Years	Sanding, oiling & staining every 2 years
Redwood	$5.00 - $8.00	20 - 25 Years	Periodic oiling to prevent graying
Composite Decking (PVC)	$7.00 - $12.00	25 - 50 Years	Minimal; simple soap and water cleanings

❓ Frequently Asked Questions (FAQ)

How do I calculate decking waste factors?

When ordering deck boards, you should always add a waste allowance. Add 10% for straight-laid patterns and 15% for diagonal or herringbone patterns. This ensures you have enough wood for cuts, trim, and minor board defects.

Is wood or composite decking a better long-term investment?

While wood decking has a much lower upfront cost ($20-$35 per sq ft installed), composite decking ($45-$75 per sq ft installed) does not require sealing or staining, saving hundreds of dollars in annual maintenance and outlasting wood by up to three decades.