Category Blog

Ten standard 4x4 fence posts need about 20 bags of 80 lb concrete — but gate and corner posts, bag size choice, and total weight all shift that number in practice. This guide gives full totals by post size, shows how to handle a mixed batch of line and corner posts, and compares bag sizes on total count and weight.

Fence posts rarely fail from bad math — they fail from small mistakes before, during, or after the pour. This guide covers the full list grouped by stage, including the genuine industry debate over whether concrete causes post rot, and how a post base bracket can sidestep the question entirely.

Most leaning fence posts fail for the same reason: plumb only got checked on one side. This step-by-step guide covers the full process — digging, gravel base, bracing on two adjacent sides, the plumb check that actually matters, pouring, crowning the top, and exactly how long to leave the bracing on before it's safe to build on.

The standard rule is 3 times the post's width, but post hole diggers and augers only come in fixed sizes — 9 and 12 inches are the two most common for a 4x4 post. This guide explains the reasoning behind the 3x rule, matches it to real available tool sizes, and shows how much adjustment "wiggle room" each hole diameter actually provides.

An 8 ft fence post needs more than a scaled-up version of a 6 ft post's numbers — wind load and deeper holes both come into play. This guide covers 4x4 vs. 6x6 sizing, depth by wind exposure and climate, the post-length availability issue tall fences run into, and full bag-count worked examples.

One page with every fence post concrete number you need — hole diameter by post size, depth by fence height and climate, bag yield by size, complete bag-count matrices for 4x4 and 6x6 posts, and total bags for a full fence line by spacing. Find your row, read across.

A 4x4 fence post in a standard 10-inch hole, 2 feet deep, needs about 1 cubic foot of concrete — roughly 2 bags of 80 lb mix. This guide gives a full volume and bag-count matrix across every common hole diameter and depth, so you can find your exact combination without running the formula yourself.

Fence post depth follows two rules, and the correct depth is whichever asks for more: a third of the post's height, or 6 inches below the local frost line. This guide breaks down frost depth by region, explains why gate posts need extra depth, and walks through worked examples showing how the same fence can need double the hole depth depending on climate alone.

Every fence post concrete calculation follows the same nine steps in the same order, whether it's a small line post or a wide gate post. This guide walks through each step with one running example from start to finish, plus a fill-in-the-blanks worksheet so you can run the same math on your own numbers.

A standard 4×4 fence post needs about 2 bags of 80 lb concrete in a properly sized 10-inch hole — gate and corner posts need closer to 6. This guide covers hole sizing and depth rules by post and fence height, dry-pour vs. wet-mix methods, and how to total up bags for a whole fence line.