How many fence pickets do I need? A 120-foot straight fence with 5.5-inch pickets and no gaps needs 262 base pickets, or 289 with a 10% example allowance. For spaced pickets, count the gaps between boards, not an extra gap after the last board. Our chart uses the same N – 1 gap calculation as the fence picket calculator.
The fence picket formula
Base pickets = round up [(length in inches + gap) / (actual picket width + gap)]. Multiply feet by 12 before using the formula. Width and gap must be in inches. Extra pickets = round up [base pickets x (1 + extra percent / 100)].
Why add the gap to the top of the fraction? N pickets cover N x width, but there are only N – 1 internal gaps. Covered length = N x width + (N – 1) x gap. Solving for N gives the formula above. This is our geometry calculation, not wording taken from a supplier worksheet. It assumes one continuous line of pickets on one side, with no overlap and no end-gap allowance.
The Outdoor Essentials worksheet hosted by Lowe’s uses a simpler estimate: length in inches divided by actual width plus spacing. It also recommends increasing the picket count by 10%. Its 120-foot, tight 5.5-inch example gives 262 pickets.1 The no-gap count matches our formula; spaced counts can differ by one board because its shortcut counts a gap with every picket. Measure the real layout before ordering.
Chart: base pickets by fence length
These are our calculated base counts, before extra. Widths are actual face widths, not nominal lumber sizes. All rows assume one side and a continuous run. Posts are not deducted from the covered length; separate runs, gate openings and layouts where pickets stop between posts need their own measurements.
| Fence length | 3.5 in, no gap | 3.5 in, 1/2-in gap | 5.5 in, no gap | 5.5 in, 1/2-in gap |
|---|---|---|---|---|
| 24 ft | 83 | 73 | 53 | 49 |
| 48 ft | 165 | 145 | 105 | 97 |
| 96 ft | 330 | 289 | 210 | 193 |
| 120 ft | 412 | 361 | 262 | 241 |
| 200 ft | 686 | 601 | 437 | 401 |
Use actual picket width
A product named 6 inches wide may not have a 6-inch face. One Lowe’s Severe Weather picket lists actual width as 5.5 inches.2 That is a product example, not a guarantee about every 6-inch picket. Read the specification or measure a board. On a tight 100-foot fence, 6-inch faces give 200 base pickets, while 5.5-inch faces give 219. That difference matters before any extra allowance.
Three checked examples
1. A tight 120-foot straight fence
Length: 120 x 12 = 1,440 inches. With 5.5-inch pickets and zero gap: 1,440 / 5.5 = 261.8182, round up to 262 base pickets. Add 10%: 262 x 1.10 = 288.2, round up to 289 pickets. At 8-foot maximum spacing, a single open-ended straight run has 120 / 8 = 15 sections and 16 posts. Three rail pieces per section gives 45 section pieces. These post and rail counts are our straight-run model, not the worksheet’s multi-run gate example.
2. A 50-foot run with 1/2-inch gaps
Length: 50 x 12 = 600 inches. With 5.5-inch pickets and 0.5-inch gaps: (600 + 0.5) / (5.5 + 0.5) = 100.0833, round up to 101 base pickets. Add 10%: 101 x 1.10 = 111.1, round up to 112 pickets. The shortcut 600 / 6 gives 100, but 100 pickets with 99 gaps cover only 599.5 inches. The end-gap assumption determines that half-inch difference.
3. A tight 96-foot straight fence
At 8-foot maximum spacing: 96 / 8 = 12 sections, 13 posts. Three rail pieces per section gives 36 section pieces. Pickets: 96 x 12 = 1,152 inches; 1,152 / 5.5 = 209.4545, round up to 210 base pickets. At 10% extra, 210 x 1.10 = 231 pickets. This example has no gate. Lay out any gate separately rather than adding an unexplained post or ignoring its opening.
Posts, rails and gates need a layout
For one straight run with both ends supported, sections = round up [length / maximum spacing], and posts = sections + 1. The worksheet uses 6- or 8-foot sections, two backer rails for a 4-foot-tall fence or three for a 6-foot-tall fence, and one cap per post.1 Those are worksheet assumptions, not a universal structural design. Use the product instructions, site conditions and local requirements for your fence.
Rail pieces = sections x rails per section in our calculator. That does not necessarily equal the number of stock boards to buy. Lowe’s installation guide explains that longer stringers can span several posts, with joints alternated on different posts; sloping ground can require shorter pieces.3 Count stock lengths after choosing the rail layout. The picket allowance does not add spare posts or rails.
The worksheet’s illustrated 120-foot project includes multiple runs and a gate, and uses 15 sections + 1 end post + 1 gate post = 17 posts.1 Do not copy 17 posts into every 120-foot fence. Subtract gate openings from each picket run, count the gate’s own boards separately and check shared corners and existing supports on a sketch. Shadowbox and board-on-board fences overlap or alternate boards, so this one-sided chart does not calculate them.
Common counting mistakes
- Using feet with inch-wide pickets. Convert the length first.
- Using nominal instead of actual face width.
- Counting N gaps for N pickets when the layout has only N – 1 internal gaps.
- Rounding down before adding an allowance. First round the base count up, then add extra and round up again.
- Treating rail section pieces as an optimized stock-board purchase list.
- Including gate openings in the fence picket count without accounting for the gate layout.
FAQ
How many pickets per linear foot?
For a long run, 12 / (actual width + gap) is a useful average. At 5.5 inches with no gap, that is 2.1818 pickets per foot. For a finite run, use the full formula and round up. A one-foot target needs three 5.5-inch pickets before trimming.
How many pickets in an 8-foot section?
For 96 inches of continuous coverage, 5.5-inch pickets need 18 with no gap. With 1/2-inch internal gaps, (96 + 0.5) / 6 = 16.0833, so 17 base pickets. If the actual between-post opening is shorter than 96 inches, or you plan end gaps, use that opening instead.
Should I buy extra?
The Outdoor Essentials worksheet recommends increasing the picket count by 10%.1 Our calculator defaults to 10%, but the right allowance depends on rejected boards, cuts and layout. The extra applies to pickets only. It does not replace a separate gate, rail or post takeoff.
What if I have several separate fence runs?
Calculate the pickets for each continuous run separately, round each run up and add them. Two runs have separate end conditions. For posts, count shared corners, gate supports and existing end supports from the layout rather than adding sections + 1 to every run blindly.
Related tools and guides
Fence picket and board calculator, fence post spacing, concrete bags per fence post, fence cost guide.
Sources
- Outdoor Essentials: Fence Calculator – Building With Pickets, hosted by Lowe’s (supplier worksheet; actual width, simplified count, rail assumptions, 10% recommendation and illustrated example)
- Lowe’s: Severe Weather dog-ear picket (supplier product example; nominal 6-inch name and actual 5.5-inch width)
- Lowe’s: Wood Fence Tips – Installing Posts, Rails and Pickets (supplier installation guide; rail spans, shorter pieces and staggered joints)