Deck & Fence Calculators

Deck and fence calculators convert a plan length or deck area into boards, panels, posts, and rails. They help you build a materials list before you stand in the timber aisle guessing how many packs fit the run.

What this category covers

• Decking: board count from deck area, board width, and gap assumptions, plus a waste line for cuts and bad boards.
• Fencing: panel count, posts, and rails from run length, panel width, and post spacing on a straight line.

Deck planning notes

Joist spacing, beam sizing, and ledger attachment are structural decisions. This calculator counts surface boards — it does not design the frame. If your local code or a lumber yard span table disagrees with a sketch you found online, follow the code and the span table.

Waste rises with picture-frame borders, diagonal decks, and lots of blocking. A simple rectangle with boards parallel to one edge needs less.

Fence planning notes

Straight, level runs match the model well. Add posts for every corner and gate by hand. Slopes may need stepped or racked panels — order a spare panel on long grade changes. Post-hole concrete is a separate takeoff; use the concrete bag tools for hole volumes.

Height changes wind load and post size more than it changes panel math. A taller privacy fence on the same line can need heavier posts even when panel width stays the same.

Cost and labour

Materials lists here exclude digging, clearing, permits, and finishing (stain, paint). Installation is often priced per linear foot or per panel — add that in the Cost Estimator if you are comparing DIY versus hire.

Related reading

Guides cover decking board estimates, fence materials for a straight run, and comparing contractor quotes. Open the matching calculator from those articles when you want to reuse the worked numbers with your fence length or deck size.