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Woodshop Math

Project plan · Outdoor

10 m Picket Fence Run: Pickets, Posts and Rails

A 10 m run of 1200 mm pre-cut pickets on two rails, with posts at no more than 2.4 m centres. Every quantity comes from the Fence Board Calculator.

AUSV Systems

Calculated plan · Last updated

10 m · 6 posts · 72 picketsone bay, 2 m between post centres120090 mm pickets · 49.6 mm gaps · rails dashed
Difficulty
Beginner
Time
2 days
Length
10 m
Bays
5 × 2 m
Est. cost
≈ $437

Cut list

PartQtySize L × W × T (mm)Material / source
Picket, pre-cut721200 × 90 × 19Treated pine picketBought pre-cut
PostLength assumes 600 mm in the ground61800 × 90 × 9090 × 90 mm treated post1.8 m post
Between-post rail sectionPost centre to post centre102000 × 90 × 4590 × 45 mm treated rail4.8 m rail stock

Kerf allowance: 3 mm per cut.

Layout

× 5Between-post rail section2,000 mmBetween-post rail section2,000 mmoffcut 797 mm
5 × Rail × 4.8 m, allocated by the Cut List Optimizer. Hatched area is offcut.

How the numbers were checked

Fence Board Calculator
72 pickets (80 with 10% waste), 6 posts, 10 rail sections from 5 lengths of 4.8 m (6 with waste).
Even spacing
72 pickets at 50 mm gaps overrun by 30 mm, so spread the gaps to 49.6 mm.

Build steps

Assumptions

  • Unit prices are assumed 2026 retail figures in US dollars for illustration only, not supplier quotes. Replace them with local prices before budgeting.
  • Pickets are bought pre-cut at the finished height; cutting pickets from longer stock is not included.
  • Post length assumes 600 mm below ground. Footing depth and concrete are not estimated because they depend on soil, wind exposure and local guidance.

Safety and scope

  • Locate underground services before digging post holes.
  • This is not engineering advice. Fence height, footings and boundary rules vary by location, so check local regulations before building.
  • Treated timber dust is an irritant. Wear a dust mask and gloves when cutting.
  • Planning estimates only — verify before you buy or build. Read the disclaimer.
Quantity basis for each material
Treated pine picket, 1200 × 90 × 19 mm
Fence Board Calculator picket count including 10% waste.
Treated post, 90 × 90 mm × 1.8 m
5 bays need 6 posts.
Treated rail, 90 × 45 mm × 4.8 m
10 rail sections, two per 4.8 m length, plus 10% waste.
Galvanised picket screws, box of 500
288 screws: 72 pickets × 2 rails × 2, plus 5% spare = 303.
Galvanised rail screws, box of 100
40 screws: 10 rail sections × 2 ends × 2.