How Many Fence Pickets Do I Need? (2026 Guide)
How many fence pickets do I need? Length × 12 ÷ (picket width + gap), rounded up — plus a size table and a worked 100 ft example.
What a fence order is really counting
A wood fence has three material lists, not one: pickets (the vertical boards), posts (the anchors, one at each end plus every spacing along the run) and rails (the horizontal stringers pickets nail to). Estimate all three before you buy — a missed count means an extra trip or leftover boards.
The fence math, step by step
We'll work a 100 ft run with 5.5 in pickets, 0.5 in gaps, 8 ft post spacing and 6 ft-tall boards as the example — your fence uses the same steps.
1. Convert the fence length to inches
Every picket and gap is measured in inches, so start there: 100 ft × 12 = 1,200 in.
2. Add one gap for the run of boards
A run of N pickets covers N board widths plus N−1 gaps, because the last board isn't followed by a gap. Adding one gap to the length keeps that final board in the count: 1,200 + 0.5 = 1,200.5 in.
3. Divide by picket width plus gap, round up
Each picket "owns" its width plus the gap that follows it: 1,200.5 ÷ (5.5 + 0.5) = 1,200.5 ÷ 6 ≈ 200.1. You can't buy a tenth of a board, so round up to 201 pickets.
4. Count the posts and rails
Posts go at both ends and every 8 ft between: 100 ÷ 8 = 12.5, rounded up to 13 spans, plus 1 end post = 14 posts. Each span between two posts carries its own rails — 3 for a 6 ft fence, 2 for a 4 ft one — so rails = (posts − 1) × rails per section: 13 × 3 = 39 rails. Run your numbers through the fence calculator and it will add concrete and hardware to the same counts.
Pickets, posts and rails for common fence lengths
Assuming 5.5 in pickets with 0.5 in gaps, posts every 8 ft and 3 rails per section on a 6 ft fence:
| Fence length | Pickets | Posts | Rails |
|---|---|---|---|
| 50 ft | ~101 | 8 | 21 |
| 100 ft | ~201 | 14 | 39 |
| 150 ft | ~301 | 20 | 57 |
| 200 ft | ~401 | 26 | 75 |
Counts are rounded up to whole boards. Wider pickets or bigger gaps shift the totals — run the formula above with your own numbers.
Picket bundles and buying tips
- Add 5–10% for waste. You'll cut at corners, gates, posts and grade changes, and a split or cupped board slips in often enough to matter — buy the extras rather than make a mid-job reorder.
- Use pressure-treated posts. Pickets and rails can be cedar, pine or composite, but posts sit in the ground — buy ground-contact pressure-treated lumber so they don't rot out from under the fence.
- Set posts below the frost line. In cold climates, dig each hole below the local frost depth and backfill with concrete; heaving posts will push rails out of level and crack joints the first winter.
Final tip
Order pickets, posts and post-mix concrete on the same trip so the lumber matches. Once your fence line is staked out, the same measure-then-estimate playbook covers the ground around it: check how much gravel you need for a driveway or how much paver base and sand to order for a patio.
FAQ
How many pickets do I need for a 100 ft fence?
With 5.5 in pickets and 0.5 in gaps: (100 × 12 + 0.5) ÷ 6 ≈ 200.1, rounded up to 201 pickets. Add 5–10% for cuts and defects when you buy.
How far apart should fence posts be?
8 ft apart is the standard for most wood fences: 100 ft ÷ 8 = 12.5 spans, rounded up to 13, plus one at the end — 14 posts total. Wider spacing lets pickets sag.
Do I need 2 or 3 rails per section?
Use 3 rails for a 6 ft fence (top, middle and bottom) and 2 rails for a 4 ft fence. A 100 ft fence with 14 posts has 13 sections, so at 3 rails each you need 13 × 3 = 39 rails.
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