Fence Post Depth Calculator
Calculate the required burial depth and total post length for a fence post.
Formula
Burial depth = fence height × 1/3 (minimum 2 ft)
- Rule of thumb: bury 1/3 of post length plus 6 inches.
- Minimum depth: 2 ft (24 inches).
- In frost zones, posts should reach below frost line.
6 ft fence, average soil
Inputs
- Fence Height Above Ground: 6 ft
- Soil Type: average
Depth = 6 × 0.333 = 2 ft. Total post = 6 + 2 = 8 ft.
Frequently asked questions
How deep below frost line?
Posts should extend below the local frost line depth (check local codes) to prevent heaving.