Fence Calculator
Calculate fence panels, posts, and rails for any perimeter.
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How It Works
Perimeter=2x(length+width). Posts=perimeter/spacing+1. Rails=posts x rails per bay. Add extra posts for corners and gates.
Formula
Panels = Length / Panel WidthQuick Reference
Common calculations — results you can verify instantly.
100×100ft yard
Perimeter=400ft, 8ft spacing
51 posts
50×80ft yard
Perimeter=260ft, 6ft spacing
44 posts
Gate opening
Adds 2 extra posts
1 gate = 2 posts
Tips & Shortcuts
Post spacing: 6-8 ft wood, 8-10 ft metal.
Posts set 1/3 of length underground: 6ft fence needs 8ft post.
Common Mistakes
Forgetting corner and gate posts
Add extra posts for each corner and each side of gate.
Not accounting for post width in rail span
Rail span = post spacing. Set posts exactly that distance apart.
Frequently Asked Questions
200/8=25 spans + 1 = 26 posts. Add corners and gate posts.
One-third of total post length. 8ft post set 2ft deep in concrete.
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