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Fence Post and Rail Materials Calculator

Posts, rails, and boards needed for a fence run.

Calculates number of fence posts = ceil(total length / spacing) + 1, rails = posts × rails_per_span, and boards if a panel fence.

Dr. Helena Ortiz By Dr. Helena Ortiz
Published Last reviewed 1 min read

Inputs

m
m
m

Results

Enter values and click Calculate to see results.
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How to use this calculator

  1. Fill in the inputs above using the units you already have.
  2. Values update automatically as you type — no submit button needed.
  3. Hover any result row for the underlying formula and intermediate values.

Formula

Posts = ceil(L/spacing)+1; Rails = (posts−1)×rails per bay

In depth

Calculates number of fence posts = ceil(total length / spacing) + 1, rails = posts × rails_per_span, and boards if a panel fence.