Fence PlannerPlan

Hypothetical planning example

Four-post concrete bag yield

Hole volume, project-level bag rounding, and why bag yield is an editable assumption — not a brand promise.

Updated 2026-07-21 · Methodology

Question this answers

How many concrete bags does the calculator buy for a short run of freestanding posts?

Assumptions

  • Short post run sized to the FP-RS-05 fixture
  • Default hole diameter/depth and bag-yield settings from the project
  • Structure posts (if any) are excluded from concrete
  • Bags are rounded at the project level after summing hole volume

Hypothetical planning example. These inputs and results explain and test Fence Planner. They do not describe a customer project or completed installation.

Plan view

Deterministic diagram from the same fixture the planner loads — not a photo of a finished job.

Top-down measured fence planGrid-backed plan showing fence runs with length labels, posts by role, and dashed gate openings where present. Post roles also appear as text in the surrounding page summary — colour is not the only cue.25 ft1 ft grid
Top-down short fence run highlighting four posts that need concrete

Calculator result

Derived with the shared materials engine — not hard-coded in this page.

  • Total fence length: 25 ft
  • Fill length (excludes gate openings): 25 ft
  • Posts: 4 total (end 2, line 2, corner 0, gate 0, terminal 0, structure 0)
  • Concrete bags (project rounding): 25
  • 3 full panels, 3 panels to buy (no cut bays)
Material lines from the estimate
ItemQtyUnit
4x4 fence posts4x4 x 10 ft ground-contact4ea
Wood fence panels6 ft H × 8 ft W wood fence panel3ea
Concrete bags12 in × 36 in holes25bags
Pyramid post capsSized for 4x4 posts4ea
Panel mounting bracketsRail/panel brackets (system-matched)12ea
Bracket mounting screws2-1/2 to 3 in exterior screws · HDG or stainless50ea

What this result means

  • Bag yield is an assumption you can edit — verify against the bag label you will buy.
  • Hole size drives volume more than “rules of thumb” on social media.
  • Use the dedicated concrete calculator when you only need bags, not a full layout.

What this scenario shows

  • Concrete tied to freestanding posts, not every drawn point
  • Project-level rounding of bag count
  • How changing yield or hole size would change the shopping number

What this does not prove

  • Does not look up frost-line depth by ZIP code.
  • Does not certify structural post embedment for wind or soil type.
  • Not a retailer quote for a named concrete brand.

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Calculations follow published methodology. Corrections welcome via contact.