Planning the board layout
Decide which way the boards run before you count them – they run across the joists. Use the actual board width and the gap from the manufacturer’s installation guide, and check whether your board length covers a full row or needs end joints, which must land on framing.
What the estimate covers
These calculators count decking surface material only. Joists, beams, posts, footings, ledgers and railings depend on loads, spans and local codes, so have the structure designed or checked by a qualified professional.