Deck Calculator
Calculate decking boards, joists, posts, concrete, and hardware for your deck build.
Deck Dimensions
feet
feet
feet
Materials
Decking Materials
Deck Area
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Decking Boards
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Linear Feet of Decking
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Framing Materials
Joists (2x8 or 2x10)
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Rim/Band Joists
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Beams (2x doubled)
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Posts (4x4 or 6x6)
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Concrete Footings
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Hardware
Deck Screws (3")
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Joist Hangers
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Post Anchors/Brackets
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Deck Building Tips
- Joist sizing: 2x8 for spans up to 3 m (10'), 2x10 for up to 4.2 m (14'), 2x12 for longer
- Post spacing: Typically 1.8-2.4 m (6-8 ft) apart, check local codes
- Footings: Below frost line (varies by region, often 90-120 cm / 36-48")
- Use joist hangers for all joist-to-beam connections
- Crown joists up - the slight bow should face upward
- Stainless or coated screws required for pressure-treated and composite
- Pre-drill near board ends to prevent splitting
Ad Space - 728x90
Joist Span Table
Maximum joist spans for common lumber (40 PSF live load):
| Joist Size | 40 cm (16") O.C. | 60 cm (24") O.C. |
|---|---|---|
| 2x6 (38x140 mm) | 3 m (9' 9") | 2.6 m (8' 6") |
| 2x8 (38x184 mm) | 3.9 m (12' 10") | 3.4 m (11' 0") |
| 2x10 (38x235 mm) | 5 m (16' 5") | 4.3 m (14' 0") |
| 2x12 (38x286 mm) | 5.5 m (18' 0") | 5 m (16' 6") |
* Based on #2 grade Southern Pine. Always check local building codes.