From Project Dimensions to the Right Number of Concrete Deliveries

Work your own numbers. The Mortar Desk material coverage calculator converts area and depth to cubic yards, tons and bag count for ten materials, with the density it uses cited on every row.

The short answer: expect about 8–10 cubic yards from a standard truck

A standard ready-mix concrete truck commonly delivers about 8–10 cubic yards. For initial planning, 10 cubic yards is a useful full-load benchmark, but it is not a universal truck capacity or a guaranteed legal payload. Commercial capacity guides report the 8–10-yard range while noting that the amount transported can vary with the truck, concrete mix, route, and site conditions. This concrete-truck capacity overview reports 8–10 cubic yards as typical for a standard mixer.

In a concrete order, one “yard” means one cubic yard, not one linear yard. A cubic yard is a volume measuring 3 feet long by 3 feet wide by 3 feet high, equal to 27 cubic feet.

Truck labels can be confusing because suppliers and equipment manufacturers do not always use terms such as mini-mix, small truck, compact mixer, and volumetric mixer consistently. Use the following source-reported ranges as conversation starters, not fixed equipment definitions.

Truck or delivery type	Approximate reported capacity	What to understand
Standard ready-mix truck	About 8–10 cubic yards	The usual basis for the “10 yards per truck” rule of thumb
Smaller or mini-mix truck	Roughly 1–6 cubic yards	Capacity varies substantially by equipment and supplier terminology
Compact volumetric mixer	About 4–6 cubic yards	Carries separate ingredients and produces concrete at the site
Larger mixer	Around 12 cubic yards or more in some configurations	Nominal capacity may exceed the amount legally or practically deliverable

The standard, smaller, and larger categories above reflect ranges reported in commercial and manufacturer comparisons rather than a formal universal standard. One manufacturer comparison reports standard trucks at about 8–10 cubic yards, smaller mixers around 4 cubic yards, and larger configurations above the standard range.

For volumetric equipment, manufacturer guidance identifies compact configurations in the 4–6-cubic-yard range, common configurations around 8–10 cubic yards, and less-common configurations above that range. Cemen Tech’s volumetric mixer breakdown distinguishes compact, common, and larger configurations.

These figures describe broad equipment categories, not promises about what will arrive. A drum’s physical volume does not establish how much wet concrete a truck can transport on a particular road or deliver to a particular site. The number that matters when ordering is the supplier’s confirmed deliverable cubic yards for each load.

Why truck capacity is not one interchangeable number

“Truck capacity” can refer to several different measurements. Treating them as interchangeable is a common source of planning errors.

Separate these five quantities:

1. Nominal drum volume: The physical or stated volume associated with the drum.
2. Rated mixing capacity: The amount the equipment is designed to mix or agitate under its operating specification.
3. Legal road payload: The amount the configured vehicle may transport over the applicable route while complying with weight restrictions.
4. Quantity ordered: The volume the customer asks the producer to supply.
5. Quantity actually delivered: The volume assigned to and discharged from a truck for that order.

A truck may have a drum associated with a larger volume while carrying a smaller load. It may also arrive partially loaded because the customer ordered less than its available capacity. If the total order exceeds the truck’s deliverable capacity, the producer must divide it among multiple loads or make another suitable arrangement.

Manufacturer guidance reports stated drum capacities around 11–15 cubic yards while describing ordinary road-transport loads as lower. That source-reported distinction is useful, but it is not a universal regulatory limit. Legal payload depends on the vehicle, axle arrangement, concrete mix, jurisdiction, and route. SANY’s capacity guide distinguishes stated drum capacity from the lower volume that may be transported under road-weight constraints.

Several factors may affect how much concrete a producer assigns to one truck:

• Truck configuration: The chassis, drum, axle arrangement, and installed equipment affect available payload.
• Concrete density and mix proportions: Different mixes may reach a vehicle’s permitted weight at different volumes.
• Road and axle restrictions: The delivery route may limit payload independently of drum size.
• Terrain and access: Difficult access may affect the truck or load the supplier is prepared to send.
• Supplier policy: Fleet availability, dispatch practices, minimum orders, and route planning can affect load division.
• Residual buildup: Accumulated concrete inside a drum may reduce usable capacity, although no fixed reduction should be assumed without information about the individual truck.

Instead of asking only, “How many yards does your truck hold?” ask:

For this mix, route, and site, how many cubic yards will the planned truck deliver?

Also ask whether any other capacity shown in the quote refers to drum volume, rated mixing capacity, or planned delivery volume. Use the planned delivery volume when estimating the number of loads.

Standard, mini-mix, volumetric, and larger trucks compared

The appropriate truck depends on the requested quantity, the supplier’s fleet, the selected concrete, applicable payload constraints, and the proposed access and unloading plan. Equipment selection is therefore best discussed with the local producer rather than made from a generic capacity label.

Conventional ready-mix trucks

A conventional ready-mix truck has a rotating drum and carries concrete batched before delivery. This is the familiar mixer truck most buyers picture when asking how many yards of concrete are in a truck.

These trucks are the basis for the commonly reported 8–10-cubic-yard range. They can carry either a full or partial load; the drum does not have to be filled simply because it has room for more concrete.

Conventional ready-mix delivery may be available for slabs, driveways, footings, patios, and other placements. However, the trucks are not necessarily interchangeable. Front- and rear-discharge arrangements, axle configurations, fleet specifications, and producer policies may differ.

Mini-mix and smaller ready-mix trucks

Mini-mix or small-truck service may be offered for lower-volume orders or locations unsuitable for a conventional full-size truck. Reported capacities run from approximately 1 to 6 cubic yards, depending on the equipment and how the supplier uses the term mini-mix. HomeGuide reports 8-yard smaller trucks and 1–5-yard mini-mix trucks while cautioning that delivery terms vary.

A supplier might use mini-mix to describe a genuinely smaller rotating-drum truck, a short-load service, or another compact delivery arrangement. Ask what vehicle and delivery method the term represents in the quote.

A smaller-truck option is worth discussing when:

• The calculated order is well below a conventional truckload.
• The supplier offers a dedicated small-load service.
• A full-size truck may not suit the proposed approach or discharge position.
• You want to compare a small truck with a partial load in a conventional mixer.

Smaller equipment is not automatically less expensive. Minimum quantities, delivery distance, service time, and local fleet availability can all affect the complete quote.

Volumetric mixers

A volumetric mixer operates differently from a conventional drum truck. It carries ingredients such as aggregate, cementitious material, and water in separate compartments, then meters and mixes them at the site.

Compact volumetric mixers are reported at 4–6 cubic yards, while 8–10-cubic-yard configurations are also common in manufacturer descriptions. These ranges overlap those used for small and standard ready-mix trucks, but the operating methods are different. Mini-mix and volumetric delivery are not synonymous. A volumetric-mixer manufacturer identifies 4–6-yard compact units and 8–10-yard configurations as the most common larger option.

Because concrete is produced at the site, volumetric service may be worth asking about when the final required quantity is uncertain. That does not establish whether the service is available locally, how the supplier measures billable volume, or what minimum and service charges apply.

Larger mixers

Some mixer configurations are reported above the ordinary standard-truck range. A larger stated capacity still does not prove that the full nominal volume can be transported or delivered. Wet concrete contributes substantial weight, and the configured vehicle must comply with the restrictions applicable to its route.

Rather than choosing a larger truck solely from an equipment chart, give the producer the requested quantity, mix designation, delivery location, access information, and unloading plan. The producer can identify an available truck and confirm its planned delivery volume.

How to calculate the cubic yards your project requires

Truck planning begins with the volume of the concrete placement, not with an assumed truck size.

One cubic yard equals 27 cubic feet. For a rectangular slab, pad, or footing with all dimensions expressed in feet, use:

Cubic yards = length × width × thickness ÷ 27

If the thickness is measured in inches, convert it to feet first:

Thickness in feet = thickness in inches ÷ 12

The cubic-foot conversion and rectangular-volume method are summarized in this ready-mix concrete calculation guide.

Example 1: 20-foot by 10-foot slab, 4 inches thick

First convert the thickness:

• 4 inches ÷ 12 = 0.3333 foot, or one-third of a foot

Then calculate the volume in cubic feet:

• 20 feet × 10 feet × 0.3333 foot = approximately 66.67 cubic feet

Convert that result to cubic yards:

• 66.67 ÷ 27 = approximately 2.47 cubic yards

The geometric volume is therefore about 2.47 cubic yards before contingency. This matches a published example using the same dimensions and calculation method.

Compared with the reported capacity of a standard truck, this is a partial-load-sized order. It does not necessarily mean the customer must buy a full truck, but minimum-order, delivery, or short-load terms may apply.

Example 2: 24-foot by 24-foot slab, 4 inches thick

Again, convert 4 inches to one-third of a foot:

• 24 × 24 × 0.3333 = approximately 192 cubic feet
• 192 ÷ 27 = approximately 7.11 cubic yards

The base quantity is about 7.11 cubic yards before contingency.

That quantity appears to fit within the source-reported range for a standard truck, but it should not yet be described as a one-truck order. First select an appropriate contingency, then obtain the supplier’s deliverable capacity for the chosen mix and route.

Measure the actual concrete shape

The formula is only as reliable as the dimensions entered. Measure to the intended concrete boundaries, not merely to the surrounding work area.

For a rectangular form, confirm the internal length, internal width, and concrete thickness. For a trench footing, use the dimensions of the space the concrete will occupy. If a placement consists of several rectangles, calculate each section separately and add the results.

Irregular work may need to be divided into simpler shapes. Calculate thickened edges, grade beams, steps, piers, haunches, and elevation changes separately unless a checked estimating method accounts for them.

The basic geometric calculation does not automatically account for:

• Over-excavation
• Uneven or disturbed subgrade
• Forms that bow or differ from the planned dimensions
• Variation in trench width or depth
• Spillage during discharge and placement
• Concrete retained in placement equipment
• Site conditions that make volume control difficult

These factors help explain why the calculated geometric volume and the final order quantity may differ.

Choosing a contingency

Commercial estimating sources commonly present 5%–10% as an initial allowance, while some recommend more for complex work. These percentages are planning ranges, not fixed specifications. Dispatch360 presents 10% as a standard calculator setting and 15% for complex pours, while identifying over-excavation, uneven subgrade, and placement losses as relevant factors.

A suitable contingency should reflect:

• Confidence in the measurements
• Form accuracy and stability
• Uniformity of the subgrade or excavation
• Complexity of the placement
• Expected placement losses
• Consequences of running short
• Advice from the producer and responsible project professional

Do not add a percentage mechanically because it appears in a calculator. Identify what could cause the actual placement volume to exceed the geometric result, then review the proposed quantity with the supplier or relevant professional.

How to turn cubic yards into a number of truckloads

Once the adjusted order quantity is known, calculate a preliminary delivery count with:

Estimated truckloads = adjusted order volume ÷ supplier-confirmed deliverable capacity per truck

Round the result up to the next whole delivery. A result of 1.05 truckloads does not mean a fraction of a truck can complete the order; it means the required quantity exceeds one confirmed load and needs another delivery arrangement.

Do not automatically use 10 as the denominator. Use 10 cubic yards only if the supplier confirms that the planned truck can deliver 10 cubic yards of the selected mix over the applicable route.

Example: 9 cubic yards plus an illustrative 10% contingency

Assume the measured base requirement is 9 cubic yards:

• Base volume: 9 cubic yards
• Illustrative contingency: 9 × 10% = 0.9 cubic yard
• Adjusted order: 9 + 0.9 = 9.9 cubic yards

If—and only if—the producer confirms a 10-cubic-yard deliverable load:

• 9.9 ÷ 10 = 0.99
• Rounded up: one delivery

Because this order is close to the assumed load limit, a confirmed capacity below 9.9 cubic yards would require another delivery arrangement.

Example: 12 cubic yards plus an illustrative 10% contingency

Assume the base volume is 12 cubic yards:

• Base volume: 12 cubic yards
• Illustrative contingency: 12 × 10% = 1.2 cubic yards
• Adjusted order: 12 + 1.2 = 13.2 cubic yards

Using an illustrative confirmed capacity of 10 cubic yards:

• 13.2 ÷ 10 = 1.32
• Rounded up: two deliveries

The producer may not divide those deliveries into exactly 10 and 3.2 cubic yards. Dispatch may allocate the volume differently based on available vehicles, route conditions, and pour coordination.

Example: the 24-foot by 24-foot slab

The base volume calculated earlier was approximately 7.11 cubic yards. Applying an illustrative 10% contingency:

• 7.11 × 10% = 0.711 cubic yard
• 7.11 + 0.711 = 7.821 cubic yards
• Rounded for the ordering discussion: approximately 7.82 cubic yards

At an illustrative confirmed capacity of 10 cubic yards, this produces a one-delivery scheduling estimate. The producer must still confirm that the planned truck can deliver the quantity and that the unloading arrangement is suitable.

Scenario table using an illustrative 10-yard deliverable truck

The table below assumes the supplier has specifically confirmed a 10-cubic-yard deliverable capacity. It is not a universal truck specification.

Adjusted order	Calculation using 10 deliverable yards	Preliminary delivery estimate
4 cubic yards	4 ÷ 10 = 0.40	1 partial-load delivery
8 cubic yards	8 ÷ 10 = 0.80	1 delivery
9.9 cubic yards	9.9 ÷ 10 = 0.99	1 delivery
10.5 cubic yards	10.5 ÷ 10 = 1.05	2 deliveries
13.2 cubic yards	13.2 ÷ 10 = 1.32	2 deliveries

The difference between 9.9 and 10.5 cubic yards illustrates how a small change in required volume can alter the number of deliveries. The result is a scheduling estimate; the producer determines the practical load division.

If the supplier instead confirms 8 deliverable cubic yards, repeat the calculation using 8. An adjusted order of 9.9 cubic yards would then exceed one load even though it falls below the familiar 10-yard benchmark.

Partial loads and the problem of needing just over one truck

A producer may accept an order smaller than the truck’s physical capacity, subject to its minimum quantities, fleet, and delivery policies. A partial load is simply a delivery that does not use all of the truck’s available payload.

Return to the 20-foot by 10-foot by 4-inch slab. Its geometric volume is approximately 2.47 cubic yards before contingency. Even after adding a project-appropriate allowance, it would remain substantially below the commonly reported capacity of a standard ready-mix truck.

Depending on local availability, the producer may propose:

• A partial load in a standard ready-mix truck
• A mini-mix or smaller rotating-drum truck
• A volumetric mixer
• Another small-order arrangement in its fleet

Partial orders may carry minimum-order, short-load, or delivery charges. No universal fee or threshold applies across suppliers. HomeGuide notes that smaller orders can incur short-load charges and that standard, smaller, and mini-mix capacities vary.

Do not assume the invoice will equal the number of cubic yards multiplied by an advertised material rate. Ask how the supplier treats concrete quantity, delivery, minimum orders, short loads, distance, waiting time, and other disclosed service conditions.

Why “just over one truck” needs special attention

Suppose a producer confirms that a truck can deliver 10 cubic yards, but the adjusted order is 10.5 cubic yards. The extra half-yard does not fit within the confirmed first load. A second delivery or another supplier-approved arrangement is needed.

This differs from a project requiring only 4 cubic yards. Both situations can involve partial loads, but the 10.5-yard project requires a full first load plus a supplemental quantity. That can affect:

• Delivery sequencing
• Crew and equipment readiness
• Placement continuity
• Supplemental-load charges
• Coordination with dispatch

Do not reduce a checked order simply to force it onto one assumed truck. Recheck the dimensions and contingency, then ask the producer how the required volume can be supplied.

Comparing small-order options

For a small or uncertain volume, request complete quotes for the locally available alternatives.

Partial standard-truck load: This may be offered where a conventional ready-mix producer serves the area, but minimum-order or short-load terms may apply.

Mini-mix delivery: A smaller vehicle may better match the quantity or proposed access. Availability and charging structures vary.

Volumetric delivery: Because ingredients are stored separately and mixed at the site, this method may suit an order whose precise final quantity is uncertain. It is not necessarily cheaper, and its operation remains subject to equipment and payload constraints.

Compare each quote on the same basis:

• Cubic yards included
• Minimum billable quantity
• Treatment of unused or additional volume
• Short-load charges
• Delivery charges
• Waiting terms
• Access conditions
• Supplemental-load policy
• Disclosed cancellation or rescheduling terms

The relevant comparison is the complete quoted service, not the advertised material price alone.

Conditions that can reduce the load delivered to your site

A truck may have enough physical drum volume for the requested concrete yet be unable to transport that amount on the planned route.

Applicable axle and road-weight restrictions can limit payload independently of drum size. Mix proportions also matter because different concrete mixes may reach a truck’s weight constraint at different volumes. Manufacturer guidance identifies vehicle specifications, road limits, terrain, project conditions, and mix proportions as factors affecting actual capacity. SANY’s capacity guide lists truck configuration, road-weight limits, terrain, and concrete mix proportions among the variables affecting load.

There is no supported universal deduction such as “subtract one yard for specialty concrete.” The producer must determine the deliverable quantity for the selected mix and vehicle.

Other matters to raise with the supplier include:

• The available truck and axle configuration
• Steep, narrow, uneven, or restricted approaches
• Soft or questionable ground
• Limited positioning or turning space
• Route-specific restrictions
• Supplier operating and safety policies

Local bridges, seasonal restrictions, and neighborhood-road rules may also be relevant, but applicable requirements must be confirmed with the supplier or responsible road authority. A generic national capacity article cannot establish a legal limit for a specific route.

Ask the producer to review the intended approach and discharge position before dispatch. Provide photographs, plans, or measurements if requested. Do not assume that a full-size loaded mixer can use a driveway, cross a yard, pass over buried services, travel beneath overhead obstacles, or stand near an excavation without project-specific review.

Avoid relying on generic gate widths, turning radii, slope limits, clearance dimensions, or pavement capacities. The appropriate requirements depend on the actual vehicle, route, ground conditions, structures, and site layout.

If the supplier determines that direct truck positioning is unsuitable, discuss another placement method with the supplier, contractor, and relevant project professional before delivery. Supplier review of truck operations is not structural approval of a driveway, slab, culvert, retaining structure, or buried installation.

What to confirm before ordering ready-mix concrete

A useful supplier call begins with the volume calculation but should also cover the concrete, truck, route, site, price, and delivery sequence.

Have the following information ready:

• Calculated base volume: The geometric volume before contingency.
• Proposed contingency: The percentage or additional quantity and the reason for it.
• Total requested quantity: Base volume plus the proposed contingency.
• Pour dimensions and type: Slab, footing, driveway, patio, pier, or another placement.
• Mix designation: Use the designation or performance requirements supplied by the responsible contractor or project professional where applicable.
• Delivery address and route concerns: Identify anything unusual about the approach.
• Unloading plan: Direct chute placement, pump, buggy, or another intended method.
• Site conditions: Slopes, confined positioning, soft ground, overhead obstacles, or restricted roads.

Capacity and truck questions

Ask:

• What exact truck type is planned?
• How many cubic yards can it deliver with the selected mix?
• Does the quoted capacity mean drum volume, rated mixing capacity, legal payload, or planned delivered quantity?
• Will the order arrive in one delivery or several?
• If divided, what quantities are expected on each truck?
• Could route or site conditions change the planned load?

The denominator for the truck-count calculation is the planned deliverable amount per truck, not the largest capacity number associated with the equipment.

Price and policy questions

Confirm:

• Is there a minimum order?
• Is there a short-load charge?
• Is delivery charged separately?
• How is a second or supplemental load priced?
• How is volumetric service measured and billed, if offered?
• What waiting terms apply?
• Are there distance, access, after-hours, cancellation, or rescheduling terms?
• How are unused concrete and over-order situations handled?

Request a quote that makes the concrete quantity and service terms understandable. That allows a fair comparison among a partial conventional load, mini-mix service, and volumetric delivery.

Access and unloading questions

Ask:

• Can the proposed truck use the intended road and entrance?
• Where can it stand while discharging?
• Does the supplier need photographs or measurements?
• Are there relevant bridge, seasonal, or neighborhood-road restrictions?
• Is the intended unloading method suitable for the truck?
• Who will direct the vehicle on site?
• What must be ready before arrival?

The supplier can identify truck-operating concerns, but that is not the same as approving the structural capacity of a driveway, pavement, culvert, slab, retaining structure, or buried installation.

Timing and multiple deliveries

For an order requiring more than one truck, ask the producer and the responsible contractor or project professional to establish the delivery sequence. There is no single interval suitable for every pour.

Coordination can depend on the mix, travel distance, weather, placement rate, crew, unloading method, equipment capacity, and geometry of the work. Confirm:

• Proposed arrival sequence
• Expected quantity on each truck
• Who will communicate with dispatch
• What happens if placement runs early or late
• Applicable waiting terms
• Transit and discharge requirements for the selected mix
• The procedure for requesting a supplemental quantity

Ask what requirements apply to the concrete actually being supplied rather than relying on a generic universal time limit.

The sequence to retain

The complete planning method is:

1. Measure the concrete placement.
2. Convert all dimensions to consistent units.
3. Calculate cubic feet.
4. Divide by 27 to obtain cubic yards.
5. Choose a contingency justified by the measurements and project conditions.
6. Add the contingency to obtain the adjusted order volume.
7. Obtain the supplier’s confirmed deliverable capacity per truck.
8. Divide the adjusted volume by that capacity.
9. Round the delivery count up.
10. Confirm load division, charges, access, unloading, route restrictions, and delivery coordination.

The final takeaway

Use 8–10 cubic yards as an initial planning range for a standard ready-mix truck, with 10 cubic yards as a convenient but nonuniversal benchmark. Do not place an order from that assumption alone.

The reliable delivery plan combines three figures:

1. The measured geometric volume
2. A contingency justified by the actual project conditions
3. The producer’s confirmed deliverable capacity for each truck

Divide the adjusted volume by the confirmed capacity, round up, and then verify partial-load terms, route restrictions, site access, unloading arrangements, and delivery timing.

Mortar Desk is a building-material reference publication, not a contractor or engineering adviser. Project-specific structural, access, mix-design, placement, and engineering decisions should be handled by the supplier and appropriately qualified project professionals.

Frequently asked questions

Is a full truck of concrete always 10 cubic yards?

No. Ten cubic yards is a common full-load benchmark, but it is not universal. Standard ready-mix trucks are commonly reported at approximately 8–10 cubic yards, while truck configuration, mix, route restrictions, and supplier practices can change the delivered amount. A commercial capacity overview reports the typical standard-truck range as 8–10 cubic yards.

Ask for the exact deliverable cubic yards planned for your order. Do not substitute nominal drum size for confirmed delivery capacity.

How do I calculate how many concrete trucks I need?

For a rectangular placement, first calculate the concrete volume:

Length in feet × width in feet × thickness in feet ÷ 27

Convert thickness from inches to feet by dividing by 12, then add a project-appropriate contingency. The formula and the fact that one cubic yard equals 27 cubic feet are reflected in published concrete calculation guidance. This concrete-delivery guide gives the same rectangular-volume formula.

Next calculate:

Adjusted cubic yards ÷ supplier-confirmed deliverable cubic yards per truck

Round up to a whole number of deliveries. For example, 13.2 adjusted cubic yards divided by a confirmed 10-yard capacity equals 1.32, producing a preliminary estimate of two deliveries.

Can I order less than a full truck of concrete?

A supplier may offer a partial load, subject to its minimum order, fleet availability, and commercial policies. A truck does not have to arrive filled to its physical capacity.

Partial orders may carry minimum-order, short-load, or delivery charges. Ask about a partial standard-truck load, mini-mix service, and volumetric delivery where available, then compare the complete quotes.

What is the difference between a ready-mix truck and a volumetric mixer?

A conventional ready-mix truck carries concrete batched before delivery and keeps it agitated in a rotating drum.

A volumetric mixer carries ingredients in separate compartments and meters and mixes them at the site. That operating method may be useful when the exact required volume is uncertain, but capacity, availability, minimums, and charging practices vary.

A mini-mix truck is not automatically a volumetric mixer. Mini-mix generally refers to a smaller-volume vehicle or service, while volumetric describes the on-site metering and mixing method.

Can a concrete truck carry 12 cubic yards?

Some larger mixer configurations are reported at approximately 12 cubic yards or more, but nominal capacity does not establish the amount that can legally and practically be delivered. Vehicle configuration, concrete mix, route restrictions, and site conditions can reduce the planned load.

If a supplier proposes a 12-yard load, ask whether that figure is the drum rating or the actual deliverable quantity for the selected truck, mix, route, and site.