How do you calculate equal spacing between fence pickets?

Measure the clear opening, subtract the total width of the pickets, then divide the remaining space by the number of gaps. If you want equal end gaps, use one more gap than the number of pickets. If pickets touch the posts, use one fewer gap than the number of pickets.

Should fence pickets have gaps?

Many privacy fences use little to no gap, while spaced picket fences often use 2 to 4 inch gaps. Wood can move with moisture, so follow your fence style, local requirements, and the material supplier's guidance.

How many pickets do I need for an 8 foot fence section?

It depends on picket width and desired gap. For example, an 8 foot clear span with 3.5 inch pickets and about 2.5 inch equal end gaps typically uses 16 pickets with an exact gap near 2.35 inches.

Fence layout calculator

Fence Picket Spacing Calculator

Plan a clean fence panel before you cut. Enter the opening width, picket width, and target gap to estimate the picket count, exact equal spacing, and material cost.

Recommended layout 16 pickets Exact gap: 2.35 in across a 96 in opening.

Panel measurements

Clear opening Opening unit Picket width (inches)

Measure the clear distance between posts or layout marks. For nominal 1×4 pickets, use the actual width, often about 3.5 inches.

Spacing goal

Target gap (inches) Equal gaps at both ends? Price per picket ($)

The calculator chooses the picket count closest to your target gap, then gives the exact equal gap to mark on the rails.

How to use this fence picket spacing calculator

Measure the clear opening between your fence posts, enter the actual picket width, and choose the gap you want. The calculator tests nearby picket counts and picks the layout with an equal gap closest to your target.

Use “include end gaps” for a balanced spaced-picket look. Choose “pickets meet posts” when the first and last pickets will sit tight against posts or trim boards.

Fence layout tips

Use actual board width: nominal lumber sizes are not the same as measured width.
Check every bay: post-to-post openings can vary, especially on older fences or sloped yards.
Make a spacer block: once you know the exact gap, cut a scrap spacer to keep installation consistent.

FAQ

What is a good gap between fence pickets?

Decorative spaced picket fences often use 2 to 4 inch gaps. Privacy fences commonly use a very small gap or overlapping boards. The best gap depends on privacy, airflow, style, and material movement.

Do I measure between posts or outside posts?

Measure the clear opening where the pickets will be placed. If the pickets fit between posts, measure inside post to inside post. If they run across the face of the posts, measure the layout span you want to cover.

Why is the exact gap different from my target gap?

Pickets are whole pieces, so the calculator finds the nearest practical count and adjusts the gap evenly. That avoids an awkward skinny gap at one end of the panel.