Calculate fence picket count and equal spacing from opening length, picket width and maximum desired gap. Plan a balanced layout before fastening pickets.
Enter your measurements and material details.
Measure the clear distance between fixed posts or boundaries after the posts are installed; small post-position errors can noticeably change the final gap.
Equal picket spacing is a layout problem, not just a material-count problem. The calculator finds a whole number of pickets that fit the clear opening while keeping the resulting gaps at or below the maximum gap you enter.
Measure the clear span where pickets will actually be placed, usually between post faces. Enter the real picket width, because nominal lumber dimensions may differ from finished width. The output gives a balanced gap that can be marked with a spacer block.
Use the clear bay width, picket width and a target maximum gap; the calculator returns a whole picket count and equal gap.
No. Use the actual measured or manufacturer-listed finished width.
This calculator treats the opening as a balanced layout with spaces distributed between pickets; end conditions should be checked against your design.
Only if the clear bay widths are close enough. Measure each bay when appearance matters.
No. Verify any maximum opening or guard requirements that apply to the project.
Using the example inputs shown in the calculator — Clear fence run (ft) = 8, Picket width (in) = 3.5, Maximum desired gap (in) = 2.5 — the result is 17 pickets. This demonstrates the formula with a complete set of numbers rather than a hidden assumption.
The result breakdown also shows Equal gap: 2.281 in; Clear run: 96 in. Replace the example values with field measurements and the exact product coverage, yield or package size you plan to buy.
For this fence picket spacing calculator, the inputs with the greatest practical effect are clear fence run, picket width and maximum desired gap. Recalculate when any of those change; do not reuse a result from a different room, run, layer depth or product specification.
These quick examples use the same calculator formula and the assumptions stated in each row. They are useful for scale checks; use your own measurements for ordering.
| Example | Calculated result |
|---|---|
| 6 ft fence bay with 3.5 in pickets | 13 pickets |
| 8 ft fence bay with 3.5 in pickets | 17 pickets |
| 10 ft fence bay with 3.5 in pickets | 21 pickets |
A useful fence picket spacing estimate begins with dimensions taken from the actual project. Small measurement errors can become significant when they are repeated across many boards, joints, courses, bags or rolls. Record the dimensions you used and keep net geometry separate from the purchase allowance so the result can be checked later.
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