Deck Calculator

Most of a deck estimate is counting: rows of board across the width, joists along the length, posts under the beam. Give the length and width, the face width and length of the board you are buying, and the gap you leave between boards, and this returns the boards to buy, the lineal feet including waste, and the screw count at two per board per joist. The framing mode counts joists at twelve, sixteen or twenty four inch spacing, the beam and rim board, the posts and footings, hangers, blocking and railing pieces, for a single level deck on one outer beam. It counts pieces and nothing else: what size joist will span your width, how deep footings go and how a ledger is bolted are span table and building code questions.

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Measurements In

How many boards cover the surface, at the width and length of board you are buying.

Feet, or metres if you chose metric. The side the boards run along, and the side against the house on an attached deck.
Feet, or metres if you chose metric. How far the deck reaches out from the house. Joists run this way.
Trade names, because that is what the label on the rack says. The 5.5 in face is the 140 mm decking sold in metric markets and the 3.5 in face is the 90 mm; the answer prints them in millimetres when you pick metric.
The length the rack actually holds, whichever system you measured the deck in. Feet in North America, metres almost everywhere else; a 4.8 m board is 77 mm shorter than a 16 ft one, so they are two products rather than one length written twice.
Inches, or millimetres if you chose metric. An eighth of an inch, about 3 mm, is normal for dry boards; wet treated lumber is often laid tight.
The module the frame is set out on. 400 mm is not 16 in rounded off, and 600 mm exists because it divides a 1200 mm sheet, so each market keeps its own rungs.
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Measurements In

The frame under the boards for a single level rectangular deck with one outer beam.

Feet, or metres if you chose metric. The side the boards run along, and the side against the house on an attached deck.
Feet, or metres if you chose metric. How far the deck reaches out from the house. Joists run this way.
The module the frame is set out on. 400 mm is not 16 in rounded off, and 600 mm exists because it divides a 1200 mm sheet, so each market keeps its own rungs.
Feet, or metres if you chose metric. How far apart the beam can carry between posts, from the span table for your beam.
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