Deck Boards

Rows across width × board run; 8% waste.

Board run (ft)

Width (ft)

Board width (in)

Gap (in)

Tab to move between fields

Rows

LF +8%583.2 LF

How to Use This Calculator

Enter the board run length in feet (the direction boards span, typically the long dimension).
Enter the deck width in feet (the direction you count rows of boards).
Enter the face width of each board in inches — a standard 5/4×6 deck board has a 5.5 inch face.
Enter the gap between boards in inches — 1/8 inch (0.125) is a common spacing.
Read the number of board rows needed and total linear feet to purchase including 8% waste.

How the result changes with Width (ft)

Board run (ft): Length each board spans (the direction boards run). Typically the longer deck dimension.
Width (ft): Width of the deck perpendicular to board direction. Determines how many rows are needed.
Board width (in): Actual face width of each deck board in inches. A standard 5/4x6 board has a 5.5-inch face.
Gap (in): Spacing between boards for drainage and expansion. 1/8 inch (0.125) is typical.

Identify Input Parameters
4 parameters
Board run (ft) = 18, Width (ft) = 14, Board width (in) = 5.5, Gap (in) = 0.125 = 4 input(s) provided
Calculate Rows
Rows
30 = 30

Engine last updated August 5, 2026. Checked against 2 independently-derived tests — how we verify calculators.

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