Project & Fence Layout
ft
ft
Spacing auto-adjusts to avoid a short tail.
Angles join consecutively (plan view). First angle is from east, others are turn angles.
Place by chainage (distance along fence). Calculator adds posts at gate edges and removes interior line-posts inside the opening.
ft
ft
Hole & Rule Settings
in
in
in
%
in
in
in
%
%
Bags & Cost
$
$
$
Typical: 56 (80lb), 60 (60lb). Adjust if your supplier differs.
Plan View
Line posts
Corner posts
Ends
Gate posts
Scale auto-fit
Summary
Posts
0
Concrete
0 ft³ (0 yd³)
Bags (rounded)
0
Cost
$0 bags vs $0 ready-mix
Per-Post Hole & Bag Details
| # | Type | Segment | Station | Dia | Depth | Shape | Volume (ft³) | Bags | Notes |
|---|
Bags by Segment
Post Types
“Show the Math” & Notes
Volume formulas
Cylinder: V = π × (D/2)² × H
Bell (cone frustum): V = π × h × (D² + d² + D×d) / 12
We subtract gravel base height and add collar height to the concrete height. Over-dig and waste multipliers apply to the final volume before bag rounding.
Rules
- Embed depth = max( (embed % × fence height), frost depth )
- Depth is measured from grade; gravel base replaces equal height of concrete
- Gates place posts at opening edges and remove line posts inside the span