Which bag size is cheapest?

Bigger bags are usually cheaper per cubic foot and mean fewer to mix — but they're heavier. Over ~1 cubic yard, ready-mix beats bags.

Cement Bag Calculator

Find how many bags of concrete mix you need — shown for **40, 60 and 80-lb** bags so you can pick the size at the store.

Loading calculator…

Work out the volume in cubic feet, then divide by each bag's yield: 80-lb ≈ 0.6, 60-lb ≈ 0.45, 40-lb ≈ 0.3 cubic feet.

A 27 cu ft pour needs about 45 × 80-lb, 60 × 60-lb, or 90 × 40-lb bags.

Which bag size is cheapest?: Bigger bags are usually cheaper per cubic foot and mean fewer to mix — but they're heavier. Over ~1 cubic yard, ready-mix beats bags.