Fence Picket Calculator

Why Fence Picket Estimates Matter

Pickets are the most visible part of any wood fence and, board for board, the biggest line item in the whole project. A 100-foot privacy fence swallows 200 or more pickets, so being off by even 10 percent means a second trip to the lumber yard — and replacement boards from a different batch that never quite match the color and grain of the originals. This free fence picket calculator exists to keep that from happening: enter your fence length and height, pick a picket width and gap, and you get an exact picket, rail, and post count before you spend a dollar.

Getting the count right up front protects both your budget and your weekend: order too many and cedar warps against the garage wall; order too few and the fence sits half-finished waiting on a restock. Because pickets, rails, and posts all share the same measurements, updating all three at once beats re-running the math by hand every time you change the gap or add a gate.

How to Use This Calculator

1. Enter your fence length and height. Walk the property line with a long tape and add up each straight run in feet, then choose a height. Six feet is the most common privacy height; 3 to 4 feet suits a front yard.
2. Select your picket width and gap. Standard dog-ear privacy boards are 5.5 inches wide (1×6 nominal). Slide the gap from a tight 1/4 inch for full privacy out to 2 to 3 inches for a classic open picket look.
3. Review your picket, rail, and post counts. The results update instantly with the pickets, rails, and posts you need, plus total linear feet of lumber so you can price the order in one pass.

How to Calculate Fence Pickets Manually

1. Measure total fence length in feet. Add up every straight segment of the run. A simple back-yard line might be 100 feet.
2. Subtract gate openings. A single walk gate is about 3 to 4 feet wide. For one 4-foot gate: 100 − 4 = 96 feet of picketed fence.
3. Convert to inches. Multiply by 12. 96 feet × 12 = 1,152 inches.
4. Add picket width + gap to get effective spacing. A 5.5-inch picket with a 1/4-inch gap is 5.75 inches per board.
5. Divide fence length in inches by effective spacing. 1,152 ÷ 5.75 ≈ 200.3.
6. Round up. That is 201 pickets, before adding roughly 5 percent for cuts and cull boards.
7. Figure posts. Fence length ÷ 8-foot spacing, plus 1: 100 ÷ 8 = 12.5, round up to 13, plus 1 = 14 posts (add 2 more for the gate).
8. Figure rails. Use 2 or 3 rails per section and multiply by the number of sections (posts minus 1). Thirteen sections × 2 rails = 26 rails.

Once you have a post count, size the footings with the fence post concrete calculator and use the concrete slab calculator for landing pads. Building a deck too? The deck board calculator handles surface boards the same way. Planning a retaining wall along the fence line? The retaining wall block calculator sizes the block courses and cap rows.

Fence Picket Sizes and Spacing Guide

Picket width and gap drive both the look and the board count. This table shows common sizes with a typical gap and how many boards fill a standard 8-foot (96-inch) section.

Common Fence Picket Mistakes

Measuring along a slope without accounting for grade. A tape pulled straight up a hill reads shorter than the stepped fence line you actually build. On sloped runs, measure the horizontal distance and plan for stepped or racked panels — both change your picket and rail counts.

Forgetting gate posts. A gate opening needs two extra heavy-duty posts — one to hang the gate and one to catch the latch — set deeper and often in bigger footings than line posts. Counting only line posts leaves you two posts short on gate day.

Not checking local fence-height codes first. Before you buy 8-foot pickets, confirm what your city and HOA allow. Many areas cap fences at 6 feet in back yards and 3 to 4 feet in front without a permit, and a too-tall fence can mean a costly tear-down.

Using untreated wood for ground-contact sections. Posts and any boards near soil need pressure-treated, ground-contact-rated lumber or rot-resistant cedar. Standard untreated pine in contact with the ground can fail within a few seasons, taking the panel above it down with it.

Frequently Asked Questions

How many pickets do I need for 100 feet of fence?

For 100 feet of privacy fence using 5.5-inch (1×6) pickets with a tight 1/4-inch gap, you need about (100 × 12) ÷ 5.75 ≈ 209 pickets. Switch to a wider 2-inch gap and that drops to roughly 160. Always add about 5 percent for cuts and cull boards.

What is the standard gap between fence pickets?

It depends on the look. Privacy fences use a 1/4 to 1/2 inch gap so cedar and pine can swell in humidity without buckling. Decorative picket fences leave a deliberate 2 to 3 inch gap. Butting boards tight with no gap almost always leads to warping.

How far apart should fence posts be?

Standard spacing is 8 feet on center, which keeps rails from sagging and uses lumber efficiently. Count one post every 8 feet, then add one for the final end post. Corners and gates need their own posts, so a run with a gate gets two extra heavy-duty posts.

Do I need 2 or 3 rails for a fence?

Use 2 rails for fences up to 5 feet tall and 3 rails for 6-foot and 8-foot fences. The third rail keeps long pickets from cupping and twisting over time. Heavy or commercial-grade fences sometimes add a fourth rail near the bottom for extra rigidity.

How tall can I build a fence without a permit?

Most jurisdictions allow backyard fences up to 6 feet and front-yard fences up to 3 or 4 feet without a permit, but rules vary widely by city and HOA. Anything taller — including 8-foot pickets — usually needs a permit. Always check with your local building department first.