Buildculus

Concrete Post-Hole Calculator

Calculate concrete for post holes — fence posts, deck footings, mailbox posts. Get bag counts, cubic feet, and cost estimates with waste built in.

Concrete Slab Calculator

Calculate concrete bags, yardage, and rebar for any slab. Live diagram, adjustable waste factor, and a complete material list you can take to the store.

How Much Concrete for a 10×36 Post Hole? (Bags, Yards, and Cost)

May 13, 2026

A 10-inch by 36-inch post hole takes about 3 80-lb bags or 0.06 cu yd of concrete. Bag counts, costs, and frost-depth guidance for common sizes.

How Much Concrete for a 10×10 Slab?

May 4, 2026

How much concrete for a 10×10 slab: about 1.2 cubic yards or 62 bags, plus base prep, control joints, curing, and the bagged-vs-ready-mix decision.