Construction

Fence Post Depth Calculator

Find how deep to set a fence post.

Calculated Output

Hole depth 0.3333

Total post length 1.333

Formula: depth = ⅓ of above-ground height

Step-by-Step Breakdown

1. Values used:

2. Post height above ground = 1

4. Hole depth = 0.3333

5. Total post length = 1.333

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The math behind it

hole depth = above-ground height ÷ 3; total post length = above-ground + depth.

6 ft above ground → 2 ft deep (8 ft post).

Frost line?

In cold climates, go below the frost line regardless.