Board-on-Board Fence Calculator
Use this board-on-board fence calculator to estimate pickets, visible coverage, posts, rails, concrete bags, waste, and optional cost. Enter fence length, post spacing, board width, overlap, gates, and prices.
Use the number of bags you expect per post. For post depth and concrete volume, use the Fence Post Depth Calculator.
Results
This calculator assumes a standard one-sided board-on-board layout. It does not include shadowbox layouts, advanced hardware, post depth, stain, or permit requirements.
How to use this calculator
- 01Enter the total fence length, height, post spacing, and gate details.
- 02Enter rails per section, picket width, overlap, waste, and concrete bags per post.
- 03Check the visible coverage. It is the picket width minus the overlap.
- 04Open the cost section and add material prices or labor if you want a cost estimate.
- 05Read the sections, posts, rails, pickets, concrete bags, material cost, labor cost, and total estimate.
Understanding the math
Board-on-board layout starts with visible coverage, not full board width. The overlap is subtracted from the picket width, so each board covers less run. That is why board-on-board fences need more pickets than a basic privacy fence.
Total gate width = gate count x gate width Adjusted fence run = max(total length - total gate width, 0) Sections = adjusted fence run / post spacing Posts = sections + 1 + gate count x 2 Rails = sections x rails per section Visible coverage = picket width - overlap Pickets per section = post spacing / visible coverage + 1 Pickets to buy = pickets before waste x (1 + waste / 100) Concrete bags = posts x bags per post
Example: a 100 ft fence with one 4 ft gate has 96 ft of board run. With 8 ft post spacing, 5.5 in pickets, 1.5 in overlap, three rails per section, and 10 percent waste, the estimate is 12 sections, 15 posts, 36 rails, 330 pickets, and 15 concrete bags.
For regular wood privacy or spaced picket material, use the Wood Fence Calculator. For non-overlap picket gap layout, use the Picket Fence Calculator. For post depth and concrete volume, use the Fence Post Depth Calculator. After installation, the Fence Stain Calculator can estimate stain quantity.
Board-on-board quick reference
Use these values as a starting point, then adjust the calculator to match your boards and overlap.
| Item | Value | Notes |
|---|---|---|
| Common fence height | 6 ft | Check local height rules before ordering material |
| Common post spacing | 6 to 8 ft | Shorter spacing adds posts and sections |
| Common picket width | 5.5 in | Use actual board width, not the nominal lumber name |
| Common overlap | 1 to 2 in | Overlap must stay smaller than the board width |
| Visible coverage example | 4 in visible | Width minus overlap controls the picket count |
| Rails per section | 3 | Board-on-board fences are often heavier than basic privacy fences |
| Default waste | 10% | Covers cuts, damaged boards, and layout changes |
Frequently asked questions
How do you calculate pickets for a board-on-board fence?
Subtract the overlap from the picket width to get visible coverage. Divide each post-spaced section by that visible coverage, round up, then add one extra overlapping board for the section. Multiply by sections and add waste.
How much do you overlap a board-on-board fence?
Many board-on-board fences use about 1 to 2 inches of overlap. The overlap must be smaller than the picket width. More overlap gives more coverage but increases the picket count.
Is board-on-board fence more expensive?
Usually, yes. Board-on-board uses more pickets than a basic privacy fence because each board overlaps the next. It may also use three rails per section because the fence face is heavier.
How many pickets do I need for 100 feet?
With one 4 ft gate, 8 ft post spacing, 5.5 in pickets, 1.5 in overlap, and 10 percent waste, a 100 ft board-on-board fence needs 330 pickets.
How do you calculate board-on-board fence materials?
Subtract gate openings from the fence run, divide by post spacing for sections, add posts, multiply sections by rails per section, then calculate pickets from visible coverage. Add concrete bags per post and waste for pickets.
What is the difference between board-on-board and privacy fence material?
A basic privacy fence usually counts boards by board width. A board-on-board fence counts by visible coverage after overlap, so the same run needs more pickets.
Related calculators
Wood Fence Calculator
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