Fence Post Concrete Calculator — Postcrete & Ready-Mix
Calculate concrete needed for fence post holes. Get postcrete bag quantities or ready-mix volume for any number of posts.
How We Calculate This
This calculator determines the concrete volume needed by calculating the volume of each post hole (cylinder) minus the volume of the post itself, then multiplying by the number of posts.
The formula
Concrete per hole = Hole volume (cylinder) - Post volume in hole
Total concrete = Concrete per hole × Number of posts
Frequently Asked Questions
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Last updated: March 2026
All calculations are estimates. Verify with your supplier.