What gap should I leave between deck boards?

Leave 1/8 in for kiln-dried boards; wet pressure-treated boards can be butted tight since they shrink.

How much waste should I add?

Add 10% for straight decks and 15% for diagonal or picture-frame patterns.

Enter your deck dimensions and board size to estimate the number of deck boards, including a waste factor and optional cost.

Estimates only. Round up and buy a little extra to account for waste, spills, and breakage.

Boards = deck area ÷ board coverage, × (1 + waste%). Board coverage = (board width + gap) × board length.

What gap should I leave between deck boards?: Leave 1/8 in for kiln-dried boards; wet pressure-treated boards can be butted tight since they shrink.
How much waste should I add?: Add 10% for straight decks and 15% for diagonal or picture-frame patterns.

Calculate board feet of lumber from thickness, width, length, and quantity.

Calculate the number of steps, rise, and run from total height.

Plan posts, rails, and pickets for a wood fence.

Estimate deck board cost by entering a price per board.