How it works
Count posts for one open straight run with a post at each end. Gates, corners and closed loops need separate treatment.
posts = ceil(length/spacing)+1
Worked example
Show example inputs and result
Straight fence length: 30 · Maximum post spacing: 2.5.
- Posts
- 13
Questions and answers
Why are some results rounded?
Results display up to 8 decimal places. Calculations use the unrounded values; very small values use scientific notation. JavaScript floating-point arithmetic can introduce tiny rounding differences.
Are my inputs sent to a server?
The calculator processes inputs in your browser. Its code does not send your values to a server.
Method reviewed: October 8, 2026 · Methods & accuracy