How this calculator works
One straight run has one more post than spans. Each span occupies a clear panel width plus a post width, with one extra end post. The tool rounds span and vertical course counts up. Default dimensions are planning examples; use the manufacturer clear span and actual post width, since a labelled panel width may instead describe post centres or overall length. Stacking courses is a count only and requires a product designed for it.
Formula
Spans = ceil((overall run - post width)/(maximum clear panel width + post width)); posts = spans + 1; courses = ceil(fence height / panel course height); panels = spans x courses; rails = panels x rails per panel.
Worked example
Three 2 m clear panels and four 100 mm posts occupy 6.4 m overall. One panel course needs three panels and four posts; at two rails per panel, six rail components are counted.
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Frequently asked questions
Are gates included?
No. Split the fence into straight runs around gates and count gate posts and gate assemblies separately.
Can I cut every panel to the equal span?
Only if the product installation instructions allow that cut and maintain the required connections. The output is a geometric equal span.
Should I buy separate rails?
Some panel kits include rails. Set separate rail components to zero if rails are already included in your purchasing unit.