Toolnoza

CONSTRUCTION TOOL

Deck Calculator

Estimate deck area, decking boards and joists from dimensions, board size and spacing.

Deck Calculator

FREE ONLINE TOOL
Formula and assumptions

Board rows = ceil((width + gap) ÷ (board width + gap)); joists = ceil(length ÷ spacing) + 1.

A planning estimate for a simple rectangle. Excludes beams, footings, fasteners, stairs, railing and structural design. Verify span and local code requirements.

A 4 × 3 m deck with 140 mm boards, 5 mm gaps, 400 mm joist spacing and 4 m stock boards needs about 21 board rows, 24 stock boards and 11 joists.

STEP BY STEP

How to use deck calculator

  1. Check the input units and assumptions.
  2. Review the result and example.

IN PRACTICE

Example

A 4 × 3 m deck with 140 mm boards, 5 mm gaps, 400 mm joist spacing and 4 m stock boards needs about 21 board rows, 24 stock boards and 11 joists.

GOOD TO KNOW

Which formula and assumptions are used?

A planning estimate for a simple rectangle. Excludes beams, footings, fasteners, stairs, railing and structural design. Verify span and local code requirements.

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