Fence Calculator
Estimate posts and panels for a simple fence run. Treat outputs as planning estimates — not a contractor takeoff.
How to use
Enter fence length, post spacing, panel width, gates, and any extra posts, then calculate. Treat the result as a starting estimate.
How the calculation works
Posts are estimated from run length and spacing. Panels use remaining length after gate openings. Extra posts can cover corners or special locations.
Formula
posts ≈ ceil(length ÷ post_spacing) + 1 + extra_posts; panel_run = max(length − gates × gate_width, 0); panels = ceil(panel_run ÷ panel_width)
Example calculation
A 96 ft run with 8 ft spacing suggests ceil(96/8)+1 = 13 posts before extras.
Assumptions
Estimate type
Simple straight-run planning estimate
Material: fence · Key: scope
Not a professional takeoff. Terrain, corners, and code can change counts.
Source: Model limitation
Post formula
ceil(run ÷ spacing) + 1 + extra posts
Material: fence · Key: post_formula
Gate posts may already be represented by spacing/end posts depending on layout.
Source: Geometric planning model
Panel formula
ceil(max(run − gate openings, 0) ÷ panel width)
Material: fence · Key: panel_formula
Assumes uniform panel width and rectangular openings.
Source: Geometric planning model
Practical notes
- Mark corners, ends, and gate posts on a sketch before buying.
- Slopes and stepped layouts often need more posts than a flat run.
- Check local code for height, setback, and post depth requirements.
Limitations
- Does not design structural posts, frost depth, or wind loads.
- Corners, transitions, and racked panels are simplified.
- Always verify with product instructions and site conditions.
FAQ
- Why is this only an estimate?
- Fence material counts change with corners, gates, terrain, and the specific panel system. This tool provides a starting point only.
- Do gates add posts?
- Use Extra posts when your layout needs dedicated gate posts beyond the basic spacing count.
Related calculators
Results are planning estimates. See the Calculator Disclaimer.