How much concrete does an 80 lb bag make?

Many 80 lb concrete bags yield about 0.60 cubic feet, but the exact yield varies by brand and mix. Check the bag label.

When is bagged concrete too much?

Once a project approaches about one cubic yard, the number of bags and mixing batches often make ready-mix delivery worth pricing.

Bagged mix

Concrete Bag Calculator

The homepage calculator converts your concrete volume into 40, 60, 80, and 90 lb bag counts. Edit the yield assumptions if your bag label lists a different cubic-foot yield.

Calculate bag count

Default bag yield table

Bag size	Default yield	Approx bags per cubic yard	Best use
40 lb	0.30 ft3	90 bags	Patch work, tiny pads, setting a post or two.
60 lb	0.45 ft3	60 bags	Small footings, short walks, manageable DIY batches.
80 lb	0.60 ft3	45 bags	Common DIY choice when lifting heavier bags is acceptable.
90 lb	0.675 ft3	40 bags	Fewer bags, heavier handling, often contractor-oriented.

Bag math

Bag count equals required cubic feet with waste divided by the bag yield. Always round up to whole bags because you cannot buy a partial bag.

Yields vary by brand, aggregate, mix type, and water ratio. The calculator uses editable defaults, not a guarantee.

Ready-mix comparison

One cubic yard is 27 cubic feet. At 0.60 cubic feet per 80 lb bag, that is about 45 bags before waste. For many people, that is the point where a truck quote is worth the phone call.