Planning guide · Outdoor
Fence Project Planning: Run Length, Panels, Posts, Corners, and Gates
Measure individual fence runs, mark corners and gates, choose panel or picket inputs, and prepare whole-unit material summaries.
Introduction
A fence plan is a sequence of runs, not one perimeter number. Start and end each run at a corner, direction change, gate opening, or other layout control point. Record the net straight length that the calculator will model, and show which posts may be shared between adjacent runs.
The calculator supports one straight run at a time in individual-picket or prefabricated-panel mode. It has no gate input and does not resolve corner sharing automatically. Model the straight net runs, keep gate materials separate, and reconcile end, corner, gate, and shared posts on the site sketch before ordering.
Planning sequence
Plan at a glance
- 01Draw every run with start/end points, direction changes, corners, and gate openings.
- 02Enter one straight net run at a time in panel or individual-picket mode.
- 03Verify panel width or post spacing and all product dimensions.
- 04Reconcile calculated sections, panels/pickets, and posts against shared corner/end/gate locations.
Calculator scope
What this calculator can estimate
- For individual pickets: sections from maximum post spacing, posts, rails, exact/whole pickets, and optional picket cost.
- For prefabricated panels: panel layout sections, posts, exact/whole panels, installed/purchased length, and optional panel cost.
- Whole-unit rounding and entered waste adjustment for one straight run.
What it does not determine
- Property boundary, easement, permit, utility location, grade stepping, wind load, structural design, post footing size/depth, or code compliance.
- Gate count, width, hardware, gate posts, corner-post sharing, end conditions, or connections.
- A universal post spacing, panel width, rail count, picket gap, or waste allowance.
Set the scope first
Decisions to make before measuring
Confirm the legal/layout line
Establish the proposed fence alignment from authoritative project information before measuring; the calculator cannot locate a property boundary.
Define each straight run
Break at corners, direction changes, gates, ends, or material changes. Give every run an arrow and ID.
Choose material mode
Use panel mode for actual prefabricated panel width or picket mode for post spacing, rails, picket width, and gap.
Plan gates outside the calculator
Subtract confirmed gate openings from affected straight runs only as the layout requires, then schedule gate leaves, hardware, and special posts separately.
Take to the site
Measurement checklist
- Run ID, start/end point, direction arrow, and net straight length.
- Corner, end, direction-change, and shared-post locations.
- Gate opening location and width on the site sketch; gate materials separate.
- Selected mode: individual pickets or prefabricated panels.
- Actual panel width, or maximum post spacing, rails per section, picket width, and gap.
- Units for every length and spacing.
- Project-selected waste allowance and optional price.
- Grade changes, obstructions, utilities, access, and boundary/permit questions for professional review.
Measurement worksheet diagram
Fence worksheet diagram: a site plan numbers separate runs and control points, marks a corner, direction arrows, gate opening, panel/post spacing, and highlights posts requiring layout reconciliation.
- Run A
- Run B
- gate opening
On-site sequence
Step-by-step site-measurement workflow
Establish control points
Mark F-A, F-B, and so on at ends, corners, gates, and direction changes. Do not begin with one summed perimeter.
Measure each run
Measure the straight distance between control points along the intended alignment. Record slope/grade notes separately because the calculator uses linear run length.
Resolve gate openings
Place gate width and posts on the sketch. The calculator has no gate field, so define which net straight run is being entered and keep gate materials outside its result.
Choose product inputs
Copy actual panel width or establish project spacing/rail/picket/gap inputs from the selected system and responsible project party.
Calculate run by run
Save sections, panels or pickets, posts, rails where applicable, whole-unit rounding, and optional cost for each straight run.
Reconcile the site layout
Overlay results on the sketch and remove only verified duplicate shared posts. Add gate, corner, brace, and special components from the approved system takeoff.
Simplify complex geometry
Break the project into simple sections
A run ends where direction, material, grade strategy, or gate condition changes. The calculator result for one run must be reconciled with neighboring endpoints.
Straight run
Enter its net measured length in one selected material mode.
Corner or direction change
End one run and begin another; review whether the physical post is shared.
Gate opening
Show separately because the calculator has no gate logic.
Different product or spacing
Start a new run/calculation even if the alignment remains straight.
Match the calculator
Input worksheet
Each row maps a physical measurement or project decision to a field that exists in the Fence Calculator.
| Calculator field | What to record | Worksheet value | Source |
|---|---|---|---|
| Mode | mode | individual pickets / panels | Selected fence system |
| Straight net run length | fenceLength | value + linear unit | Control-point measurement |
| Maximum post spacing | maximumPostSpacing | value + linear unit | Project/system decision; picket mode |
| Rails per section | railsPerSection | whole number | Project/system decision; picket mode |
| Picket width | picketWidth | value + linear unit | Selected product; picket mode |
| Picket gap | gap | value + linear unit | Project/system decision; picket mode |
| Panel width | panelWidth | value + linear unit | Selected product; panel mode |
| Waste allowance | wastePercent | project-selected percent | Layout/cut review |
| Unit price | price | optional currency value | Current quote for panel or picket |
Verify, do not assume
Product-dependent inputs
Panel width or spacing
Use actual selected panel width or the project-established maximum post spacing. Neither is a universal recommendation.
Picket and rail inputs
Picket width, gap, and rails per section apply only in individual-picket mode and must match the chosen system.
Gate and special posts
No calculator field represents gates, gate posts, corner hardware, or shared posts. Carry them in a separate layout schedule.
Before calculation
Check the measurements
Planning comparison visualization
Illustrative assumptions: Illustrative panel layout: Run A 30 ft, Run B 18 ft, actual panel width P ft. No gate field, waste, or assumed shared-post rule.
Panels per run = ceil(run length ÷ P); baseline posts = panels + 1
| Planning step | Value | Basis |
|---|---|---|
| Run A | ceil(30 ÷ P) panels | Straight control-point run |
| Run B | ceil(18 ÷ P) panels | Separate direction |
| Baseline posts | Run A panels + Run B panels + 2 | Each isolated run has panels + 1 |
| Site reconciliation | verify shared corner + gate/end posts | Layout decision outside calculator |
From estimate to order
Calculated quantity versus purchase quantity
Sections and panels round up so one straight run is covered; posts are tied to the section layout, but the page plan may share a corner post between two runs or add special gate/end posts. Reconcile physically, not by blind addition.
Preserve run-level results, then create a site total with a separate adjustment log for shared posts, gates, corners, ends, and special hardware. Do not alter run length just to force a preferred unit count.
Make the estimate reviewable
Supplier or contractor handoff checklist
- Site sketch with control points, run IDs, direction arrows, corners, gates, and post locations.
- Net length, mode, panels/pickets, sections, posts, and rails by straight run.
- Actual product dimensions, spacing/gap decisions, allowance, and price source.
- Shared-post reconciliation and separate gate/special-component schedule.
- Notes on grade, access, obstructions, and utility-marking coordination.
- Owner/contractor review for boundaries, permits, wind/structural design, footing depth, and local requirements.
Avoid hidden assumptions
Common planning mistakes
Entering one perimeter
Different runs round separately and meet at corners, gates, or product changes.
Subtracting a gate without a layout
The calculator has no gate logic; net run length and special posts must be documented on the sketch.
Adding all post counts blindly
Adjacent runs may share a corner post, while gates or ends may require special posts outside the baseline.
Assuming spacing or code
Use project, manufacturer, professional, and local requirements for the selected fence system.
Planning questions
Fence Calculator planning FAQ
Can I enter the whole fence perimeter at once?
No. Enter each straight run separately so direction changes and whole-unit rounding remain visible.
Does the calculator include gates?
No. Show gate openings and special posts on the site plan and estimate gate materials separately.
Why do posts not always equal the final site total?
Each run has a baseline section layout, but shared corners, ends, and gate posts require physical reconciliation.
Does the calculator locate property lines or choose footing depth?
No. Boundaries, permits, utilities, structural design, and footing requirements are outside its scope.
Claims checked against primary material
Sources
- Simpson Strong-Tie — Fence Planner (opens in a new tab)
Supports planning fence runs, post locations, materials, and connections from a site layout.
- American Wood Council — DCA 6 Deck Guide (opens in a new tab)
Supports the boundary between a decking-board estimate and structural deck design.
Continue with the same project