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MaterialNest

Fencing estimator

Fence Post Calculator: Quantity & Layout

Count the posts that belong at ends, corners and gates, then fill each fenced run with line posts. A straight line, a closed rectangle and connected custom segments have different endpoint conditions even at the same total length.

Count and locate fence posts

Interactive estimator

Set fence boundaries before line-post spacing

Record endpoint-post centreline lengths and shared corners. Fence gate offsets end at the near inside face, and widths span the clear opening. Keep the full segment length; the positioned gate splits it into fenced runs.

Measurement system

  1. 01 Measure
  2. 02 Calculate
  3. 03 Review

01 / Your inputs

Measurements

Start with the fence path

Measure each fence segment

A segment runs from one endpoint post centreline to the next. Place each gate by the distance from that start centreline to the near inside face of its clear opening.

Clarify measurement terms
  • Endpoint = end or shared corner post
  • Gate offset = start-post centreline to near inside face
View measurement sketchMeasure each fence segmentA segment runs from one endpoint post centreline to the next. Place each gate by the distance from that start centreline to the near inside face of its clear opening. Endpoint = end or shared corner post. Gate offset = start-post centreline to near inside face.SEGMENT 1SEGMENT 2Orange marks the shared corner

1Measure the section layout

Record the centreline distance of every fence run, then add gate openings where they interrupt the post stations.

Measurement format: 10.5 ft, 8 ft 3 1/2 in, or 96 in

Advanced layout1 section · 0 corners · 0 gates

Connect the fence runs at shared endpoints, classify corners, and position each gate so its support posts are explicit.

Section connections

Segment 1

Endpoint roles · 0 corners

Gates

Start the gate offset at this fence run's first post centreline and measure to the near inside face of the clear opening. Its far inside face sets the second boundary post. Leave the entered centreline run intact rather than deducting post-face thickness.

No positioned gates.

2Place line posts between fixed boundaries

Supply the selected fence-system limit; each run is divided separately. Examples: 10.5 ft, 8 ft 3 1/2 in, or 96 in

3Choose spare stock separately

Added to purchases; not placed on the fence drawing.
Optional local pricingQuantity works without prices
Optional price per item
Optional price per item
Optional price per item

The calculation runs entirely in this browser.

On this page
  1. 01Calculator
  2. 02Before accepting the fence sketch
  3. 03Match every post category to the fence sketch
  4. 04Gate placement and shared corners
  5. 05A straight fence and a positioned gate
  6. 06The run-by-run count record
  7. 07Use the installed post count for the next estimate

Before accepting the fence sketch

  • Letting a span exceed your selected maximum.
  • Counting gate posts as line posts.
  • Omitting corners from a custom layout.

Match every post category to the fence sketch

01Fixed boundaries come first
Terminal ends, corners and the two posts around each gate are counted separately from line posts. A rectangle reuses its four corners instead of adding open-ended terminal posts.
02Line posts belong within each fenced run
Moving a gate leaves its width unchanged but changes the run lengths on either side. Those runs round separately, so the line-post count can change. Read each run's actual spacing rather than treating the segment average as every interval.
03Order spares by product category
Installed positions and extra stock are different quantities. When adding spares, choose line, terminal/corner or gate type so the purchase list and optional price refer to the intended post.

Gate placement and shared corners

Why does moving a gate change the post quantity?

A gate splits one segment into two separately rounded fenced runs. Moving it can make either run require an additional span and line post.

Are corner posts counted once?

Yes. Reuse the same corner endpoint for the adjoining segments and the calculator counts that physical corner once.

Can two gates touch or share one boundary post?

No. This calculator models two distinct boundary posts per gate and requires a positive fenced run between gates. Combine a multi-leaf assembly into one clear opening when that matches the selected gate system.

The fence-post method and gate-boundary examples were reconciled by MaterialNest on September 13, 2026; footing and site decisions are left to the project. Editorial and correction policy.

A straight fence and a positioned gate

1. 100 ft straight fence

Complete inputs

Layout

Layout type
Straight
Corner endpoints
0
Endpoint roles
endpoint-start: terminal; endpoint-end: terminal
Section 1
100 ft; endpoint-start to endpoint-end

Post assumptions

Maximum line-post spacing
8 ft
Extra posts
0

Expected result

Line posts
12
Terminal / end posts
2
Corner posts
0
Gate posts
0
Extra posts
0
Total posts
14
Maximum spacing
8 ft

Manual derivation

  1. 100 ft / 8 ft = 12.5, so round up to 13 equal spans.
  2. Thirteen spans require 12 line posts between two terminal posts, giving 14 total.

Example drawing

Fence post layout
Fence post layoutFence post layout. 14 calculated posts, including 2 terminal posts, 0 corner posts, 12 line posts, and 0 opening posts. Section 1: 100 ft run at 7 ft 8 5/16 in spacingSCALED ELEVATIONSection 1END / CORNER / OPENINGLINE POST14 POSTS · 1 SECTION

Post stake-out stations

Stations are cumulative measurements from each section's start endpoint-post centreline. Recheck the selected system and field geometry before layout.

Section / runRun rangeLengthSelected maximumSpansActual spacingPost stations
Section 1 · Run 10 in–100 ft100 ft8 ft137 ft 8 5/16 in0 in (section boundary); 7 ft 8 5/16 in (line); 15 ft 4 5/8 in (line); 23 ft 15/16 in (line); 30 ft 9 1/4 in (line); 38 ft 5 9/16 in (line); 46 ft 1 7/8 in (line); 53 ft 10 1/8 in (line); 61 ft 6 7/16 in (line); 69 ft 2 3/4 in (line); 76 ft 11 1/16 in (line); 84 ft 7 3/8 in (line); 92 ft 3 11/16 in (line); 100 ft (section boundary)
2. 10 m fence with centered gate

Complete inputs

Layout

Layout type
Straight
Corner endpoints
0
Endpoint roles
endpoint-start: terminal; endpoint-end: terminal
Section 1
10000 mm; endpoint-start to endpoint-end

Openings and gates

Gate 1 - Section 1
2000 mm wide at 4000 mm from section start

Post assumptions

Maximum line-post spacing
2500 mm
Extra posts
0

Expected result

Line posts
2
Terminal / end posts
2
Corner posts
0
Gate posts
2
Extra posts
0
Total posts
6
Maximum spacing
2500 mm

Manual derivation

  1. The gate creates two 4 m fenced runs; each divides into two spans and contributes one line post.
  2. Two end posts + two gate posts + two line posts = six.

Auditable calculation record

The run-by-run count record

Post stations here follow your measured fence runs, gates, and maximum spacing; they are quantity estimates, not an installation plan. Soil, wind, footing dimensions, product instructions, and permits can change what the fence needs. Resolve those requirements locally and seek qualified advice for critical conditions.

Formula version
2.1.0
Last reconciled
September 13, 2026
Measurement datum
Section length runs from start endpoint-post centreline to end endpoint-post centreline; gate offsets end at the near inside opening face.
Rounding
Every uninterrupted run rounds up to the fewest whole spans that stay within the selected maximum. Installed and spare posts remain separate whole quantities.
Known exclusions
Post size, footing design, wind loading, installation method, and local spacing requirements are not selected.
Review the complete methodology