Fence calculator
A fence is a repeating bay. Everything follows from the run length and the bay width.
Posts needed
18
- Bays
- 17
- Actual bay width
- 1.765
- Rail timber
- 93.3
- Pickets or boards
- 200
- Picket timber
- 360.0
- Post timber including the buried part
- 43.2
- Concrete for the posts
- 0.630
Show the working
- Fence run = 30
- Bay width = 1.83
- Rails per bay = 3
- Picket width = 100
- Gap between pickets = 50
- Fence height = 1.8
- Bays = ceil(30 / 1.83) = 17
- Posts needed = 17 + 1 = 18
- Rail timber = 17 * 1.83 * 3 = 93.33
- Pickets or boards = ceil(30 * 1000 / (100 + 50)) = 200
- Picket timber = 200 * 1.8 = 360
- Post timber including the buried part = 18 * (1.8 + 0.6) = 43.2
- Actual bay width = 17 > 0 ? 30 / 17 : 0 = 1.764 71
- Concrete for the posts = 18 * 0.035 = 0.63
Values are shown to six significant figures here; the arithmetic itself runs on exact fractions and is only rounded where a number is printed.
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The formula
- posts = ceil(run / bay) + 1