Fence Post Depth Calculator

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Calculates the recommended depth for fence posts based on the post height and soil conditions.

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Post Height Above Ground (feet) and Soil Type in the units shown.

Step 2

Read Recommended Post Depth Below Ground (feet) and Total Post Length (feet) in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

See the inputs and their calculated results.

Post Height Above Ground (feet): 6; Soil Type: Average

Recommended Post Depth Below Ground (feet): 1.5 feet; Total Post Length (feet): 7.5 feet

Post Height Above Ground (feet): 4; Soil Type: Loose/Sandy

Recommended Post Depth Below Ground (feet): 1.3332 feet; Total Post Length (feet): 5.3332 feet

Post Height Above Ground (feet): 8; Soil Type: Rocky/Clay

Recommended Post Depth Below Ground (feet): 1.6 feet; Total Post Length (feet): 9.6 feet

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