Fence Post Depth Calculator
Determine proper fence post hole depth based on post height, soil type, and frost line. Includes concrete bag count.
Frequently Asked Questions
How deep should fence posts be?
Minimum 1/3 of post length below ground, or 24 inches, whichever is deeper. In frost zones, go below the frost line.
How many bags of concrete per fence post?
A 10-inch diameter by 30-inch deep hole needs 1.5 to 2 bags of 50 lb pre-mix concrete per post.
Do I need concrete for fence posts?
Yes for most structural fences. Alternatives include gravel or post foam for shorter, lighter fences.