Concrete guide
Bagged Concrete vs Ready-Mix
Compare bagged concrete and ready-mix delivery by volume, access, labor, timing, waste, and total project cost.
Updated Reviewed by SupplyCalc Editorial
Quick answer
Bagged concrete is best for small pads, post holes, repairs, and jobs where a truck cannot reach the pour. Ready-mix is usually better when the project needs enough volume that hand mixing slows placement or creates finish problems. The crossover depends on local prices, delivery minimums, rental tools, helpers, access, and how quickly the crew can place concrete.
The math comparison starts with volume. One cubic yard is 27 cubic feet. If an 80 lb bag yields about 0.60 cubic feet, one cubic yard takes about 45 bags. A 2 cubic yard project would need about 90 bags. At that point, the labor of moving, opening, mixing, placing, and cleaning up bags may outweigh the control of buying material at retail.
Comparison table
| Factor | Bagged concrete | Ready-mix delivery |
|---|---|---|
| Best fit | Small pours and limited access | Larger slabs and timed placement |
| Volume planning | Bags by yield | Cubic yards |
| Labor | High mixing and handling effort | Lower mixing effort, faster placement |
| Timing | Flexible, slower batches | Scheduled truck window |
| Access | Works through tight paths | Needs truck or buggy access |
| Cost drivers | Bag price, mixer rental, labor | Delivery fee, minimum order, short-load fee |
Use the table as a planning screen, then price both options locally. Some small projects are cheaper with bags even if labor is higher. Some medium projects are cheaper with ready-mix once you include mixer rental and the time needed to produce consistent batches.
When bags make sense
Bags are useful when the pour is small, the site is tight, or the work can be completed in controlled batches. Fence posts, small shed pads, short walkway panels, step repairs, and isolated patio extensions are common examples. Bags are also easier to buy in phases if the layout is uncertain or weather may interrupt work.
The tradeoff is labor. Every bag must be carried, opened, mixed with measured water, moved to the form, and cleaned up. Inconsistent water or mixing time can change strength and finish. If a slab requires many batches, the first concrete may begin setting while later batches are still being mixed.
When ready-mix makes sense
Ready-mix becomes attractive when volume, finish quality, and placement speed matter. Larger patios, driveway sections, garage slabs, and thickened pours benefit from a steady supply. The crew can focus on spreading, screeding, edging, jointing, and finishing instead of feeding a mixer.
Access is the major constraint. A truck may need a driveway, alley, pump, buggy, or wheelbarrow route. Delivery often includes minimum quantities or short-load fees, so a small project may still cost more than bags. Ask the supplier about truck time, cancellation rules, distance charges, and whether the mix is appropriate for the slab.
Cost comparison method
Calculate the concrete volume first. Convert to cubic yards and bag count. Then compare the full project cost, not only material price.
For bags, include bag price, delivery or pickup, mixer rental, extra water containers, helpers, and waste. For ready-mix, include the quoted cubic-yard price, delivery fee, short-load fee, extra truck time, pump or buggy cost, and crew size. Add waste to both estimates. For a simple slab, 10 percent is a common planning margin, but site conditions may require more.
Planning example
Say a patio needs 1.25 cubic yards after waste. That is 33.75 cubic feet. With 80 lb bags yielding 0.60 cubic feet, the job needs 57 bags. If each bag costs less than the delivered ready-mix quote, bags may look cheaper at first. Now add the time to load, unload, stage, mix, place, and clean up 57 bags. Add mixer rental if the crew does not own one.
For ready-mix, ask about the minimum delivery amount and any short-load charge. A truck may deliver more concrete than the exact estimate, but the faster placement can improve the finish and reduce stress on the crew. The better choice is the one that fits both the budget and the pour schedule.
FAQ
How many 80 lb bags equal one cubic yard?
At 0.60 cubic feet per 80 lb bag, one cubic yard takes 45 bags because one cubic yard is 27 cubic feet.
Is ready-mix always cheaper?
No. Delivery fees and minimum orders can make ready-mix expensive for very small pours. Compare total project cost.
Are bags weaker than ready-mix?
Not automatically. Strength depends on the product, water ratio, mixing, curing, and job requirements. Follow the product label.
When is a project too large for bags?
There is no single cutoff. Once the bag count is high enough that mixing delays placement or finishing, compare ready-mix.
Do both options need waste?
Yes. Waste covers uneven forms, handling loss, low spots, cleanup, and small measuring errors.
Can I combine bags and ready-mix?
It is usually cleaner to plan one method. Bags can be useful for small corrections, but the main pour should be planned consistently.
Sources and assumptions
Last updated 2026-05-09. This guide uses standard volume conversions, cited concrete references, and common retail bag yields. Local delivery quotes, product labels, weather, access, reinforcement, and code requirements should control the final decision.