Deck Calculator - Calculate Deck Materials
Calculate deck materials including boards, joists, and hardware. Free deck calculator with cost estimates.
Deck Calculator: Estimate materials for your deck including boards, joists, and hardware.
Deck Materials
Deck Area
192
square feet
Decking Boards
423
5/4×6 boards (with 10% waste)
Joists (2×8)
11
16" on center
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Deck Materials
Calculate decking boards, joists, posts, and hardware. Standard deck uses 5/4×6 boards, 2×8 joists 16 inches on center, 4×4 posts. Include concrete footings and fasteners.
Frequently Asked Questions
How much does deck cost?
Pressure-treated: $15-30 per sq ft installed. Composite: $25-45 per sq ft. A 12×16 deck costs $2,900-8,600 installed.
How many deck boards needed?
For 5/4×6 boards: divide deck length by 0.5 ft. Multiply by width. Add 10% waste.
How far apart deck joists?
16 inches on center standard. Some composite requires 12 inches. Check manufacturer specs.
Do I need permit for deck?
Most areas require permits for decks over 30 inches high. Check local codes.
What size joists for deck?
2×8 spans 12 ft, 2×10 spans 16 ft, 2×12 spans 18 ft at 16 inch spacing.
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