How this site is built
Review the calculation methodology to see which figures are exact geometry, which depend on material assumptions, and which figures have recorded sources. The source registry records every cited figure and its review status.
How the fence calculator works
Sections are the run divided by maximum spacing, rounded up so spacing never exceeds the limit. An open run needs one more endpoint post than sections; a closed loop does not.
Gate sides, corners, stepped grade and terminal conditions are layout events. Add their extra posts explicitly rather than hiding them in a vague waste percentage.
Formula used for fence calculator
The calculator keeps the measured quantity separate from any purchase rounding or allowance.
- Sections
ceil(run length ÷ maximum spacing) - Open-run posts
sections + 1 + layout extras - Closed-loop posts
sections + layout extras
Planning choices for fence calculator
| Situation | Use | Why it matters |
|---|---|---|
| Straight open run | Open-run mode | Counts both endpoints |
| Closed enclosure | Closed-loop mode | First post is also the last |
| Gates or direction changes | Add explicit posts | They are physical layout events |
These are measurement and ordering choices, not structural specifications or code requirements.
Measure and order fence
Measure every run along the fence line. Draw gates, ends and corners before trusting a count.
Maximum spacing is not a structural recommendation. Use the fence system, site conditions and local requirements to choose spacing and footing details.
Fence Calculator questions
Why are there more posts than sections?
An open line of sections needs a post at both ends, so posts equal sections plus one.
Does a gate need extra posts?
Usually gate openings have dedicated posts; enter the extra count from the hardware layout.
Does this calculate pickets?
No. Pickets depend on panel style, picket width and gap.
Variables and units
For the default “Open fence run” mode. Other modes label their own fields in the calculator.
length- Total fence length: ft, in, yd, m, cm.
spacing- Maximum post spacing: ft, in, yd, m, cm.
gates- Extra posts for gates and corners: unitless; optional.
Worked example: a 96 ft open run
A fence runs 96 ft with posts no farther than 8 ft apart and two extra posts at a gate.
| Field | Value |
|---|---|
| Total fence length | 96 ft |
| Maximum post spacing | 8 ft |
| Extra posts for gates and corners | 2 |
| Result | Value |
|---|---|
| Posts to plan for | 15 posts |
| Fence sections | 12 sections |
| Even spacing before layout changes | 8 ft |
These figures are generated by the same calculation the calculator above uses, so they update automatically if the method changes.
Where these numbers come from
This calculator uses geometry and values shown in the form. Editable product dimensions, coverage figures, prices and allowances are inputs, not universal recommendations; confirm them against the product label, drawing or supplier quote.
Content release:
Published by Material Totals. Review the methodology and source assumptions.
Related calculators
- Decking CalculatorEstimate deck boards from surface area, actual board width, gap, stock length and cuts.
- Board Foot CalculatorCalculate total board feet from nominal thickness, nominal width, length and piece count.
- Rebar CalculatorCalculate rebar linear feet and bar runs from slab dimensions, spacing and lap allowance.
- Paint CalculatorEstimate paint for room walls, one wall, a ceiling or known area using coats and product coverage.
- Tile CalculatorEstimate whole tiles from area, tile dimensions, grout joint and a cut or breakage allowance.
- Flooring CalculatorCalculate whole flooring boxes from room area, carton coverage and a cuts allowance.