Fence calculator

Standard spacing is 6–8 ft (1.8–2.5 m): use 6 ft for solid wood fences in windy areas and 8 ft for chain link or lightweight panels. Heavier infill and stronger wind mean closer posts.

A third of the above-ground height and always below the local frost line — typically 24–48 in depending on climate. Set posts in concrete with the hole about 3 times the post width, and slope the top of the footing away from the post.

Two rails are enough up to about 5 ft of height; use three rails above that and for solid board fences that catch wind. The bottom rail should sit no more than 12 in above grade.

A 10 in hole 36 in deep takes roughly 1.5 cu ft — about two to three 50 lb bags of premix per post. Fast-setting mix can be poured dry into the hole and watered for typical residential fences.