Privacy Fence Calculator
Calculate posts, rails, pickets, and concrete needed for a privacy wood fence.
Formula
Posts = ⌈length/spacing⌉+1; Rails = bays×2; Pickets = ⌈length×12/(width+gap)⌉×1.05
- Add a third rail for fences over 6 ft.
- Picket widths: 1×4 = 3.5 in actual; 1×6 = 5.5 in actual.
- Standard post spacing: 6–8 ft for wood privacy fences.
100 ft, 6 ft high, 8 ft posts, 5.5 in pickets, no gap
Inputs
- Total Fence Length: 100 ft
- Fence Height: 6 ft
- Post Spacing: 8 ft
- Picket Width: 5.5 in
- Gap Between Pickets: 0 in
Posts: 14. Rails: 26 (2/bay). Pickets: ⌈1200/5.5⌉×1.05 = 219×1.05 = 230 pickets.
Frequently asked questions
How far apart should fence posts be?
8 ft OC is standard for wood privacy fences with 2×4 rails. Heavy panels (composite, vinyl) may need 6 ft OC.