Fence Calculator
Turn a fence length into posts, rails, pickets or panels, and bags of concrete from the post spacing.
Processed locally in your browser — nothing is uploaded.
Fence Calculator
6 or 8 ft is standard
2 for ≤6 ft tall, 3 above
50-lb bags; 1–2 per post is typical
Enter the fence length to estimate materials.
About Fence Calculator
From the run length and post spacing (6 or 8 ft presets) it computes sections, posts including the end post, and rails at 2–3 per section. Picket mode counts boards from the picket width and gap; panel mode simply needs one prebuilt panel per section. A bags-per-post field totals the concrete.
Common uses
- Build a materials list for a 100 ft privacy fence
- Compare stick-built picket counts against prebuilt panels
Example
Input
100 ft, 8 ft spacing, 2 rails, 5.5 in pickets with 0.5 in gap
Output
13 sections · 14 posts · 26 rails · 200 pickets · 28 bags
Limitations
- Assumes one straight run; corners and gates add posts and hardware
- Panel mode assumes spacing matches the panel width
Frequently asked questions
How many fence posts do I need for 100 feet of fence?
At 8 ft spacing, 100 ft divides into 13 sections, which takes 14 posts — always one more post than sections for a straight run. At 6 ft spacing it's 17 sections and 18 posts.
Should fence posts be 6 or 8 feet apart?
8 ft is the standard for most wood privacy fences and matches common rail lengths. 6 ft spacing makes a stiffer fence for windy sites, tall solid panels, or heavier boards, at the cost of more posts and concrete.
How many bags of concrete per fence post?
Commonly 1–2 60- or 80-lb bags per post, depending on the hole diameter and depth — a 10 in wide, 24 in deep hole around a 4×4 takes about two 80-lb bags. This calculator multiplies your bags-per-post figure by the post count.
How do I calculate the number of fence pickets?
Divide the fence length in inches by one picket width plus one gap. A 100 ft run with 5.5 in pickets and 1/2 in gaps is 1,200 ÷ 6 = 200 pickets; board-on-board styles that overlap need more.
Do my fence measurements leave my device?
No. The post, rail, picket, and concrete math all runs in your browser — nothing you enter is uploaded or stored anywhere.