Layout model and usable dimensions
Even fence post spacing avoids a short leftover bay at the end of a straight run. This calculator divides the measured distance between end post centers into equal bays that do not exceed your chosen maximum center spacing. It returns the number of bays, number of posts, and a station list measured from the first end post. Use the output to mark a layout line before digging. The maximum spacing must come from the fence system or a suitable project design; this calculator does not select post sizes, foundations, or wind-rated spans.
Read the fence post spacing outputs
- Posts including both ends
- End posts are included for this continuous run. Shared corners across separate runs need reconciliation.
- Equal bays
- Bay count is rounded before equal spacing is calculated.
- Post center spacing
- Center spacing includes the post width.
- Clear space between posts
- Clear space excludes the physical post faces.
Fit, direction and offcut constraints
- Clear panel opening and center-to-center post spacing are different measurements. Check which dimension your panel system specifies.
- Gates and corners interrupt the run and should be laid out as separate segments.
- The final site layout must account for utilities, property boundaries, grade, and any local requirements before excavation.
Layout arithmetic and example
A worked example
A 100 ft center-to-center run with an 8 ft maximum divides into 13 bays and 14 posts. Centers are 7.6923 ft apart; 3.5 in posts leave about 88.8077 in clear.
Measure and compare a layout
- Establish the two end-post center locations.
- Enter the largest center spacing permitted by your selected fence system.
- Mark each equal station from a single reference point to reduce accumulated error.
Frequently asked questions
How do I avoid a short last fence panel?
Divide the run into equal bays using the rounded-up bay count rather than repeatedly marking the maximum spacing.
Are the station marks post edges or centers?
They are post center locations. The clear opening result subtracts one actual post width from the center spacing.
Can I use 8 feet for every fence?
No. Use the span permitted for the product, loads, post arrangement, and project conditions.
Read the project guides
- Fence Material Takeoff: Posts, Pickets, Gates and Equal Spacing
Break a fence into runs, account for gate openings, lay out posts, count pickets, and estimate finish for the surfaces actually coated.
Calculation method: JICWH methodology. Examples are planning assumptions, not product recommendations.