Bags vs ready-mix concrete
Under about one cubic yard, bags are usually the practical choice. Above it, a ready-mix truck usually costs less per yard and gives a better pour. The line moves with your prices, your plant’s fees and how much mixing you are willing to do.
The short version
| Situation | Usual choice | Why |
|---|---|---|
| Fence posts, a few piers, a small pad, repairs | Bags | Small volume, pour at your own pace, no delivery fee |
| Steps, a shed slab, a short walkway (around 1 cu yd) | Either | Price both; mixing 45 bags is a full day |
| Patio, driveway, garage floor, footings (2 cu yd and up) | Ready-mix | Lower cost per yard, one continuous pour, no cold joints |
| Site a truck cannot reach | Bags, or ready-mix with a pump or buggies | Access decides, not volume |
Cost
Bagged mix costs more per cubic yard of finished concrete than ready-mix, because you are paying for packaging, shelf space and handling. Ready-mix is priced per cubic yard delivered, but the plant adds fees: a delivery charge, a short-load fee if your order is below their minimum, and sometimes waiting time if unloading takes longer than the included time. For a small pour those fees can be larger than the concrete itself, which is why bags win small jobs.
The site does not publish price averages, because they vary too much by region and change through the year. Get the bag price from your store and the per-yard price, minimum load and fees from a plant near you, then enter them in the cost calculator.
Worked example at illustrative prices
Suppose 80 lb bags are $6.50, ready-mix is $165 per cubic yard, delivery is $75, and the plant charges a $100 short-load fee on orders under 3 yards. These are example figures, not quotes.
| Pour | To order | Bags (80 lb) | Bag cost | Ready-mix cost | Cheaper |
|---|---|---|---|---|---|
| 4 × 4 ft pad, 4 in | 0.25 cu yd | 10 | $65.00 | $216.25 | Bags by $151 |
| 10 × 10 ft slab, 4 in | 1.50 cu yd | 62 | $403.00 | $422.50 | Bags by $20, but a day of mixing |
| 24 × 12 ft patio, 4 in | 4.00 cu yd | 176 | $1,144.00 | $735.00 | Ready-mix by $409 |
Ready-mix cost = yards × $165 + $75 delivery, plus $100 short-load fee on the first two. The 10 × 10 slab is the tipping point: bags are marginally cheaper, but 62 bags is 4,960 lb to lift and mix.
Labor and time
Each bag has to be carried, opened, mixed with measured water and placed. With a portable mixer that takes two bags at a time, a small crew can place a yard in a few hours if everything is set up. By hand in a wheelbarrow it is much slower. For a slab, all of that has to happen fast enough that the first batch has not started to set before the last one is placed, which is the real limit on bagged pours.
A ready-mix truck delivers the whole order in one go and the driver discharges it down the chute into your forms. Your job is to spread, screed and finish, which is work enough.
Quality of the pour
- Consistency. Ready-mix is batched by machine to the strength you order. Bagged concrete varies with how carefully each batch is watered.
- Cold joints. If one batch sets before the next is placed, the slab has a weak seam. A continuous pour from a truck avoids this. With bags, keep the pour small or have enough people to keep up.
- Strength. Standard bagged mix is rated around 4,000 psi when mixed correctly, which is fine for home projects. Ready-mix can be ordered at the strength and slump your project needs, with air entrainment for freeze-thaw climates.
Minimum loads and short-load fees
A truck and driver cost the plant the same whether they deliver one yard or ten, so plants set a minimum order and charge a short-load fee below it. Some plants also offer smaller “mini mix” trucks or metered on-site mixing for small orders. Ask about all of them. When you call, have these ready: the cubic yards you need, the strength (3,000 or 4,000 psi is typical for home projects), the date and time, the access to your site, and whether you need the truck to wait.
When bags are the only option
If the truck cannot get within chute reach of the forms and you are not hiring a pump, bags may be the practical answer even for a larger pour. In that case, split the work into sections with planned joints, so each section is poured continuously in one session.
How to decide
- Get the volume from the right calculator, including waste.
- If it is under a quarter yard, buy bags and stop here.
- Otherwise, get a bag price and a plant quote with all fees.
- Enter both in the cost calculator.
- If the costs are close, choose ready-mix for anything over a yard. Your back will thank you, and the slab will be better.