🚧 Decking, Fencing & Siding Calculators
📝 JusTheTool Editorial | 🔄 Last reviewed: July 21, 2026 | 8 tools
Outdoor structures are the category where building code shows up most often in a DIY project — guard heights, baluster gaps, stair geometry, post depth. Getting the quantity right matters less than getting the spacing legal.
These calculators flag the relevant code limits as you work, but local amendments always govern. Confirm with your building department before you buy.
Most used in this category
- Vinyl Siding Calculator
Calculate how many squares and boxes of vinyl siding you need — including gables, minus windows and doors — with material cost estimate. - Deck Material Calculator
Calculate exactly how many deck boards, joists, and screws you need. Supports 5/4 and 2x decking with gap spacing, picture framing, and waste factor.
All decking, fencing and siding tools
- Fence Calculator: Boards, Posts & Lumber
Calculate fence posts, panels, rails, and concrete for any fence length. Supports wood, vinyl, chain link, and aluminum fencing with gate allowances. - Baluster Spacing Calculator
Baluster spacing calculator for deck railings. Find how many balusters and the exact even gap that meets the 4-inch code between posts. - Board & Batten Calculator
Board and batten calculator. Find the number of battens, exact on-center spacing, and gap for an evenly spaced accent wall or wainscoting. - Stair Stringer & Rise/Run Calculator
Free stair building calculator: stringer length, rise, run, and tread depth for any total height. Code-compliant calculations for indoor and deck stairs. - How Much Does It Cost to Build a Fence in 2026?
A contractor's cost breakdown for wood, chain-link, vinyl, and aluminum fencing, including a 10-year cost comparison and a printable installation chec - Composite vs. Wood Decking: The 15-Year Cost Breakdown (2026 Guide)
Composite vs Wood Decking: A contractor's 15-year cost breakdown with a cumulative cost crossover chart and a printable wood deck maintenance schedule
Before you order
- Measure twice, at the building. Plans and reality diverge. A wall drawn at 30 ft is often 30 ft 1 in once framed.
- Add a waste factor. Every calculator here exposes one. The defaults are industry-standard ranges, not guarantees — complex layouts need more.
- Confirm code locally. We cite the model IRC where a limit applies. Your jurisdiction amends it, and your building department has the final word.
- These are estimates, not quotes. Useful for budgeting and comparing options; not a substitute for a supplier quote or a licensed professional.
How we derive every figure is set out on our methodology page, including the code sections and manufacturer specs behind each constant.
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