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For more precise calculations, you can use tools like the Omni Fence Post Depth Calculator . How Deep And Wide Should Fence Posts Holes Be?

: Most builders recommend burying one-third of the total post length in the ground. For a standard 6-foot fence, the post should be at least 2 feet deep. 22084mp4

If you are instead asking about the technical specifications for a "deep post" (as in a structural fence post): For more precise calculations, you can use tools