Concrete for Fence Posts
Estimate concrete bags for fence posts using hole diameter, depth, post size, and count.
Measure hole size
Post hole volume depends on diameter and depth. Round holes use radius x radius x 3.14 x depth.
Subtract post volume roughly
The post takes some space inside the hole, but many rough estimates ignore it and add a small waste buffer.
Multiply by post count
Estimate one hole, then multiply by the number of posts that will be set in concrete.
Check fence requirements
Wind exposure, soil, frost depth, and fence height can change hole depth and concrete needs.
FAQ
How much concrete per fence post?
It depends on hole diameter and depth. A bigger or deeper hole uses much more concrete.
Should every fence post be set in concrete?
Requirements vary by fence type, soil, climate, and local practice.
Do gate posts need more concrete?
Often yes. Gate posts carry more load and movement than line posts.
Related guides
Next step
Open the calculators and enter your dimensions to estimate materials before you shop.