Deck Material Calculator
Calculate all materials needed for deck construction including boards, joists, posts, and footings.
Formula & Explanation
The deck material calculator determines quantities of all major materials for deck construction. Deck Boards = (Deck Area) ÷ [(Board Width + Gap) × Board Length] Joist Linear Feet = Joists Quantity × Joist Length Posts Needed = User input (typically calculated as posts along length × posts along width) Footing Volume = Number of Posts × Footing Depth × π × (Hole Diameter ÷ 2)² This calculator combines results from specialized calculators for boards, joists, posts, and footings to give a comprehensive material takeoff.
Assumptions
- •Deck boards include 10% waste allowance
- •Joists are evenly spaced along the deck length
- •Posts are placed at regular spacing intervals
- •Footing holes are assumed to be 12 inches diameter and circular
- •Footing depth is below the frost line (verify local code)
- •Post quantity should be calculated separately and entered
- •Material costs not included - use individual calculators for pricing
Example Calculation
A 16x12 deck requires 37 boards, 156 linear feet of 2x8 joists, 4 posts, and 9.4 cubic feet of concrete for footings.
Inputs
Results
Standard Framing Lumber Sizes for Deck Construction
| component | material | use | grade |
|---|---|---|---|
| Deck Boards | 2x6 PT | Surface decking | #2 Standard |
| Joists | 2x8 PT | Span support (10-12 ft) | #2 Ground Contact |
| Joists | 2x10 PT | Span support (12-15 ft) | #2 Ground Contact |
| Beams | 2x10/2x12 PT | Primary support | #2 Ground Contact |
| Posts | 4x4 PT | Under 8 ft height | #2 Ground Contact |
| Posts | 6x6 PT | Over 8 ft height | #2 Ground Contact |
| Concrete | 60/80 lb bags | Post footings | Standard Mix |
Frequently Asked Questions
Related Calculators
Deck Board Calculator
Calculate the number of deck boards needed to cover your deck surface, accounting for board width, length, gaps, and waste.
Deck Joist Calculator
Calculate the number of joists needed for deck framing based on span length and spacing requirements.
Deck Post Calculator
Calculate the number and size of posts needed for deck support based on deck dimensions and height.
Deck Footing Calculator
Calculate concrete volume and bags needed for deck footing holes below the frost line.
Deck Cost Calculator
Calculate total deck project cost including materials, labor, waste, and taxes.