A reliable order is a verified takeoff plus a stated allowance plus a delivery plan the plant can actually execute.
Numbers to plan with
The takeoff sheet the dispatcher expects
Ready-mix plants sell volume and time. The person taking your order needs a number, a mix, a placement method, and an address a truck can reach. Everything else is negotiation. Arriving with a takeoff that shows how the number was built is the difference between one clean phone call and three calls from a driver parked at the curb.
Build the sheet in pieces, in cubic feet, and keep the arithmetic visible. Field slab, apron, walkway, pads, thickened edges, footings, piers, and steps each get a line with length, width, and depth in feet. Inches become decimals before multiplication: 4 inches is 0.333 feet, 5 inches is 0.417, and 6 inches is 0.500. Divide the cubic-foot total by 27 for cubic yards. Do not convert each piece to yards and round as you go; rounding belongs at the end.
Recheck the forms the morning you order. Excavation, rain, and compaction work all move grade. A subgrade averaging 1 inch low across a 600-square-foot pour consumes about 1.9 cubic yards more than the drawing suggests, roughly $350 at $185 per yard. Across a 2,400-square-foot driveway, the same inch costs 7.4 cubic yards, over $1,300. Grade control is not a formality; it is the largest single variable in the order.
A worked driveway order, three pours at a time
Take a 24 by 24 foot driveway at 5 inches, a 12 by 20 foot apron at 4 inches, and a 4 by 8 foot equipment pad at 6 inches. Each is a separate rectangle, so each gets a separate line and its own thickness conversion.
That discipline matters because a single blended thickness across all three pours would be wrong in both directions. Using 5 inches everywhere overstates the apron by 20 cubic feet, about three quarters of a yard. Using 4 inches everywhere understates the driveway by 48 cubic feet and the pad by 5.3 cubic feet. Neither error is large on its own, and both are avoidable by keeping one line per thickness.
Takeoff for a 24 × 24 ft driveway with an apron and an equipment pad
| Pour section | Dimensions and thickness | Volume (cu ft) | Volume (cu yd) |
|---|---|---|---|
| Driveway field | 24 × 24 ft at 5 in | 240.0 | 8.89 |
| Front apron | 12 × 20 ft at 4 in | 80.0 | 2.96 |
| Equipment pad | 4 × 8 ft at 6 in | 16.0 | 0.59 |
| Total before allowance | 848 sq ft of surface | 336.0 | 12.44 |
| With 10% allowance | Grade and spillage | 369.6 | 13.68 |
Choosing the allowance: 5, 10, or 15 percent
The field slab works out to 576 square feet at 0.417 feet: 240 cubic feet, or 8.89 cubic yards. The apron is 240 square feet at 0.333 feet: 80 cubic feet, 2.96 cubic yards. The pad is 32 square feet at 0.5 feet: 16 cubic feet, 0.59 cubic yards. The total before allowance is 336 cubic feet and 12.44 cubic yards, and 10 percent brings it to 13.68.
Plants commonly sell in quarter-yard increments and a truck carries 8 to 10 cubic yards, so that order becomes two trucks and 13.75 yards. At $185 per cubic yard the concrete is $2,544. The second truck carries only 3.75 yards, which falls under many plants' 4- or 5-yard minimum and may trigger a short-load charge. The volume is right and the invoice is not finished.
The allowance is not a fudge factor for bad measurement. It covers grade variation under a form, minor form deflection, material left in the chute and the pump, and the finishing edge that always consumes a little more than the plan. On flatwork over a proof-rolled base, 5 percent is often enough. On machine-excavated footings, 10 percent is common because trench walls cave and bottoms are uneven. Where concrete goes directly against rough excavation, 15 percent is not excessive.
Do the cost comparison honestly. On a 12-yard order, 5 percent is 0.6 yards, about $111. Running short by half a yard means a cold joint, a call for a 1-yard load with a $75 to $150 short-load fee, and a 45- to 90-minute wait while the first concrete sits and stiffens. The surplus almost always costs less than the shortage. Surplus still has to go somewhere legal, so have a pre-dug footer, a trash pad, or a lined washout area ready before the truck arrives.
Charges that are not concrete
The quoted price per yard is the smallest part of some invoices. Ask for the full fee schedule when you confirm the order and write the answers on the takeoff sheet, because fees that surprise you at delivery cannot be negotiated from the curb.
Common ready-mix charges beyond the concrete price, 2026 US ranges
| Charge | Typical range | When it applies |
|---|---|---|
| Short-load fee | $75–$150 | Load under the plant's 4–5 cu yd minimum |
| Part-load premium | $20–$40 per cu yd | Orders of 1–4 cu yd in some markets |
| Waiting time | $60–$120 per 30 min | After 5–10 free minutes on site |
| Saturday or after-hours | $150–$400 | Scheduling outside weekday daylight |
| Fuel and environmental surcharge | $8–$25 per cu yd | Applied variably, revised quarterly |
| Boom pump | $800–$1,500 minimum | Often a 3–4 hour minimum plus travel |
| Line pump | $400–$800 minimum | Shorter reach, slower placement |
Specify the mix, not just the yardage
Those ranges are 2026 US figures and they move by region. A yard of 4,000 psi concrete that costs $165 in a midwestern metro can cost $250 in a coastal city or in a rural county far from a plant. Ask each supplier for the delivered price per yard including every surcharge, then compare plants on that number rather than the bare concrete price.
Pumping deserves its own decision. A boom pump places 60 to 100 cubic yards an hour and reaches over a house, but its minimum charge can exceed the cost of the concrete on a small job. A line pump is slower and cheaper and needs a clear path for hose. Chute placement straight from the truck is free but limited to about 16 to 18 feet of reach from the rear of the drum, and every 10 feet beyond that is a wheelbarrow, a powered buggy, or a pump.
A plant will sell 3,000 psi concrete all day, and it will be wrong for some pours. Exterior flatwork in a freeze-thaw climate needs air entrainment, typically 5 to 7 percent, and a strength that suits the exposure: 3,000 to 3,500 psi for patios and walkways, 4,000 psi for driveways and anything with vehicle traffic. Interior slabs that will be covered can use 2,500 to 3,000 psi.
Slump is the workability number on the ticket, usually 4 to 5 inches for flatwork placed by chute. A mix that arrives at 7 inches has already been watered, and a mix specified at 7 inches to make finishing easier will shrink more and crack more. Maximum aggregate size of 3/4 to 1 inch is typical for residential flatwork; tight reinforcing or a pump line may call for a smaller nominal size. Air content, water-cement ratio, and batch time all appear on the same ticket. Read it before the driver starts turning the drum.
Access, weight, and the physics of the last 30 feet
A fully loaded 10-cubic-yard truck weighs roughly 60,000 to 70,000 lb, about 27,000 to 32,000 kg. That load needs a driveway base that can take it, a gate at least 10 to 12 feet wide, and 13 to 14 feet of vertical clearance for the drum and chute. A soft lawn, a paver driveway over sand, or a septic field is not a truck route, and a cracked drive apron from a delivery is a cost nobody budgets for.
Plan the truck's path and the chute's swing before the first truck arrives. A rear-discharge truck with standard chutes reaches 16 to 18 feet from the rear axle. Turning radius matters as much as width: a truck that cannot turn around will back out over the lawn, and a loaded truck backing 100 feet is how fences, mailboxes, and gas meters get hit.
Discharge is a race against the clock. Most specifications limit discharge to 90 minutes from batching, and 10 cubic yards takes roughly 45 to 60 minutes to place through a chute if the crew keeps pace. That leaves little slack for a stuck wheelbarrow or a finisher who needs another pair of hands. On multi-load pours, space trucks 20 to 30 minutes apart so the first placement has started setting before the second arrives, but not so far that a cold joint forms between loads.
Placement, cold joints, and the final yard
Wet concrete should be placed in horizontal layers and worked into corners with a spud vibrator or a shovel, not dragged with a rake. Dumping from height separates aggregate from mortar and leaves a rocky, weak patch that shows up as a delamination a season later.
A cold joint forms where fresh concrete is placed against concrete that has taken its initial set. It is a plane of weakness that reads as a straight line and often as a crack. If a truck is late, the options are to slow the placement, to stop at a construction joint that was planned anyway, or to accept and document the cold joint. Those are decisions to make before the pour with the finisher on site, not at 2 p.m. with a chute in the air.
The last yard is where a job either closes cleanly or generates a complaint. Have a use for it, place it in a washout area lined with plastic, or let the driver take it back to the plant. Concrete discharged into a storm drain sets into a plug that requires a saw, a permit, and an uncomfortable conversation about the Clean Water Act.
Then cure. Seven days of curing compound, plastic sheeting, or wet burlap is the difference between a surface that dusts under a broom and one that holds up for decades. The order was the easy part; the first week of curing is what the slab is judged on.
Questions that come up on this job
How much extra concrete should I order?
Five percent on flatwork over a proof-rolled base, 10 percent on formed footings and typical slabs, and up to 15 percent where concrete goes against rough excavation. The allowance covers grade variation and spillage, not measurement error. Verify the forms first, then apply the percentage.
Why is a 3-yard order so expensive?
Because the concrete is not the whole invoice. Most plants charge a short-load fee of $75 to $150 below a 4- or 5-yard minimum, plus a part-load premium per yard in some markets, plus delivery and any environmental surcharge. Ask for the delivered total before comparing suppliers.
Can I order half a yard?
Some plants will sell it with a short-load fee; others have a 1-yard minimum and a few require 2 or 3 yards. Below about half a yard, bag mix or a bulk bag is usually cheaper and easier than a truck, provided you can mix and place it fast enough to avoid cold joints.
What happens if the truck arrives late?
The clock started at batching, not at your curb. Beyond roughly 90 minutes the mix may be too stiff to place without adding water, which is exactly what you do not want. If a load is delayed, place it against a planned construction joint rather than letting it set in the drum or dumping it on top of concrete that has already stiffened.
Do I need a pump for a backyard pour?
Measure the distance from the nearest truck parking spot to the farthest point of the pour. Under about 18 feet, chutes work. Between 18 and 60 feet, a powered buggy or a line pump is usually faster than wheelbarrows. Beyond that, or over a fence or house, a boom pump's minimum charge is often justified by labor saved.
Sources & further reading
References behind this guide
These sources support the safety, measurement, or industry conventions used above. Product instructions, approved plans, and local requirements control your project.