# How Deep Should A 4 Foot Fence Post Be?

A fence post that is 4 feet tall and has a cross section that is 3 inches by 3 inches will have a post hole that is approximately 1.25 feet (16 inches) deep and 9 inches wide. For a fence that is 4 feet high, a post that is 3 inches by 3 inches should be 5.25 feet long. The additional length is necessary in order to accommodate the ground hole that will be dug for each post.

Dig a hole for the post with a diameter that is three times the width of the post; for example, the hole for a wood post that is four inches wide should be around twelve inches wide. The depth of the hole should be one third to one half of the height of the post above the ground (i.e., a 6-foot tall fence would require a hole depth of at least 2 feet).

## How deep do fence posts need to be?

For instance, if you are creating a fence that is six feet high, the posts need to be placed at a height of six feet above the ground.Because the result of dividing 6 by 3 is 2, the required depth of the hole is 2 feet.It is recommended that the diameter of the post hole be three times as wide as the width of the post itself.

Please consult the table that follows in order to determine the needed width and depth of the hole for your posts.

## How do you calculate 1/3 of a fence post height?

To calculate a third, simply divide the required post height above ground by three. This will give you the answer (i.e a 6ft post height divided by 3 would equal 2, so a 2 foot hole would need to be dug). … And a half, well, that’s simple enough; simply cut the required post height in half. How Far Below the Surface Should a Concrete Fence Post Be Installed?

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## What size fence post marker do I Need?

For instance, if you’re using posts that are 4 inches in diameter, we know that the hole in the ground has to be 12 inches square. To construct a hole that is 12 inches square, measure out 6 inches from each of the four faces of the fence post marker you’re using.