Decking Calculator
Smart Decking Calculator
Accurately calculate deck surface boards, joists, support beams, posts, concrete bags, and material cost.
📐 Deck Dimensions
Custom Sizes📋 Estimate Summary
192 sq ftDeck Surface Boards
5/4" x 6" x 16' (+10% waste)
Floor Joists
2x8 x 12' PT @ 16" O.C.
Beams & Rim Joists
Double 2x10 Beams & Rim
Support Posts
4x4 / 6x6 PT @ 3.5' High
Concrete Bags
50 lb Fast-Setting Mix
Hardware & Screws
Hangers, Bolts & Screws
Why Builders Trust Decking Calculator
Engineered for accurate lumber takeoffs according to residential building standards.
Precise Joist Counts
Calculates framing quantities including ledger boards, rim joists, and standard on-center joist spacing (12", 16", or 24").
Real Lumber Sizing
Supports pressure-treated pine, cedar, redwood, and composite decking profiles.
Budget & Waste Control
Includes customizable cutting waste factors (5% to 15%) so you never run out of materials.
Frequently Asked Questions
Quick tips before shopping for lumber.
What joist spacing should I choose?
Standard 16" on-center (O.C.) spacing is ideal for most 5/4" wood deck boards. For diagonal boards or composite decking, 12" O.C. is recommended.
How much waste should I add?
For simple rectangular decks, 10% is standard. If your deck features picture framing or diagonals, allocate 15% for waste.
How deep should post footings be?
Footings must extend below your local frost line (typically 12" to 48" depending on your region) to prevent frost heaving.
Can I export this material list?
Yes! Click "Print / Save PDF" to create a bill of materials you can take directly to Home Depot, Lowe's, or your lumberyard.
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