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Concrete Bags to Cubic Yards Calculator

Convert a count of 80 lb concrete bags into cubic yards to compare bagged mix against a ready-mix delivery.

Computed in your browser — nothing you enter is uploaded. Figures are presented for United States against IRC 2024, and every formula is cited under regulatory standards below.

Last verified 2026-08-26 · v1.0.0

Market
Imperial · sales tax

Equivalent volume

1 cu yd

High confidence

An 80 lb bag yields about 0.6 cu ft; 27 cu ft make a cubic yard. Yield varies by product — confirm the cubic feet per bag printed on the mix you are actually buying.

Conversion factor applied
0.02 cu yd per bags

The decision behind this conversion is nearly always bags versus ready-mix. Expressing a pile of bags as cubic yards puts both options in the same unit, and the answer is often sobering: a single cubic yard is roughly forty-five eighty-pound bags, which is well over a ton and a very long day with a mixer. Local delivery minimums and short-load surcharges vary, so the cost crossover moves around, but the labour crossover tends to arrive earlier than the material one. Yield figures differ between products — high-strength and rapid-set mixes are not the same as standard — so take the cubic feet per bag from the actual bag rather than from a general rule.

Add the equipment this sizes

This result is a specification — 1 cu yd — not a quantity. Put the thing it sizes into your project: how many, what you call it, and your supplier’s price.

Preliminary estimate, not certified engineering. This tool produces an indicative quantity calculation for planning purposes only — it is not a certified structural analysis, a guaranteed material takeoff, or a substitute for building department approval. Always verify measurements on-site and have a licensed contractor or structural engineer review any load-bearing, code-sensitive, or safety-critical work before purchasing materials or starting construction. Spotted an arithmetic or standards error? Report it to contact@craftquantities.com with your inputs — confirmed fixes become pinned regression tests.

[Schema Verified] Computed in alignment with American Concrete Institute (ACI 318-19) formulas and International Residential Code (IRC 2024) spatial boundaries.

Regulatory standards & verification citations

  • Typical yield for an 80 lb bag of standard concrete mix: approximately 0.6 cubic feet of set concrete
  • 1 cubic yard = 27 cubic feet, so roughly 45 x 80 lb bags per cubic yard

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Most jobs need more than one number. Add the calculators you need next and they open right here, underneath this one — your figures stay on screen and nothing is lost to a page change.

Frequently asked questions

At what point is ready-mix cheaper than bags?
Usually somewhere around one cubic yard, though it depends heavily on local delivery minimums and short-load charges. Forty-five bags is a great deal of mixing, and the labour alone often justifies a delivery well before the material cost does.
Why 0.6 cubic feet per bag?
That is the typical set yield printed by major manufacturers for an 80 lb bag of standard mix. It varies slightly by product — high-strength and fast-setting mixes differ — so check the bag rather than assuming.
Does mixing water change the yield?
Within the specified range, not meaningfully; the water becomes part of the paste. Adding water beyond the stated maximum increases volume slightly but reduces strength substantially, which is never a worthwhile trade.