Construction

Board-on-Board Fence Calculator

Count boards for a board-on-board (overlap) fence.

Fence length

Board width

Overlap

Calculated Output

Boards needed 0

Formula: boards = length × 12 ÷ (board width − overlap)

Step-by-Step Breakdown

1. Values used:

2. Fence length = 1

3. Board width = 1

4. Overlap = 1

6. Boards needed = 0

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The math behind it

boards = fence length (in) ÷ (board width − overlap). Count both front and back rows.

100 ft, 5.5 in boards, 1.5 in overlap → 300 boards.

Two rows?

Yes — front and back boards. Multiply the result by 2 if using one board per row.