Fence calculator: posts, sections, pickets and concrete
One row per fence run: its length. Enter your post spacing, rails, pickets, hole size and the concrete printed on the bag: the calculation counts the rest. One fence style at a time.
Concrete per bag and hole size (reference)
The yield printed on a bag of fast-setting concrete mix, cited as a guide: enter the one on your bag. The same maker digs a hole about 3 times the post width, 1/3 of the post length deep plus 6 in of gravel, and stops the concrete 3 to 4 in below grade.
| Bag | cu ft | Liters |
|---|---|---|
| 50 lb | 0.375 | 10.6 |
| 60 lb | 0.45 | 12.7 |
| 25 kg | 0.41 | 11.6 |
| 30 kg | 0.5 | 14 |
Source: Quikrete 1004 data sheet
Pool enclosure: the rules as read (reference)
The pool enclosure rules, as read in the texts. Many places adopt them with local changes: check the version your city enforces and its fence bylaw.
| Rule | US (ISPSC 2024) | Quebec |
|---|---|---|
| Height | At least 48 in, measured on the outside | At least 1.2 m |
| Openings | Stop a 4 in sphere | Stop a 10 cm sphere; nothing that helps climbing |
| Chain link mesh | 1 3/4 in or less | 30 mm or less |
| Gap under the fence | At most 2 in over grass or gravel, 4 in over a solid surface | No rule in this text |
| Gate | Opens outward, closes and latches on its own; latch release at 54 in or more, or on the pool side | A passive device closes and locks it on its own, inside at the top of the gate or outside at 1.5 m or more |
Sources: ISPSC 2024, 305; Quebec residential pool safety regulation (S-3.1.02, r. 1)
How it is calculated
For each run: sections = length / spacing, rounded up, and posts = sections + 1 (each run has its two ends). Rails = sections x rails per section. Pickets = length / (picket width + gap), rounded up. Concrete per hole = (pi x diameter² / 4 - post width²) x concrete depth: a square post in a round hole. Bags = posts x concrete per hole / concrete per bag, rounded up on the total. No spacing, hole size or bag yield comes filled in: they are yours and the bag's.
The whole job in MesuPro
Fence survey
Runs by style, posts, sections, rails and pickets, gates, concrete bags and the old fence to remove.
Feet and inches by default
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