How Many Cubic Yards Are in a Dump Truck?
A standard single-axle dump truck holds about 5 to 7 cubic yards of material. A tandem-axle (two rear axles) typically carries 10 to 16 cubic yards, and a tri-axle hauls more, often 15 to 20 cubic yards. The exact number depends on the truck's bed size and the weight of what you're hauling.
That last part matters more than most people expect. Heavy materials like sand and gravel hit a truck's weight limit long before they fill the bed. So the cubic yards a truck can hold and the cubic yards you'll actually get loaded are often two different numbers. Below we break it down by truck class, show the volume-versus-weight tradeoff, and explain how to turn a load size into the amount you should order.
How many cubic yards does a dump truck hold?
Most dump trucks fall into three classes by axle count. Single-axle trucks hold roughly 5 to 7 cubic yards. Tandem-axle trucks, the most common type for material delivery, hold about 10 to 16 cubic yards. Tri-axle and quad-axle rigs go higher, often 15 to 20 cubic yards or more, depending on bed length and local road weight limits.
Bed size is the physical ceiling. A typical tandem dump bed measures around 14 to 16 feet long, and dump body builders like Ox Bodies publish bed capacities in the 12 to 18 cubic yard range for standard contractor models. But the bed is only half the story. Public road laws cap how much weight any truck can legally carry, and for heavy aggregates that weight cap is what really decides your load.
How many cubic yards does a tandem dump truck hold?
A tandem-axle dump truck holds about 10 to 16 cubic yards of loose material. The tandem is the workhorse of aggregate delivery because it balances a useful payload with the ability to maneuver into driveways and job sites. Federal weight rules under the FHWA bridge formula limit a standard tandem to roughly 12 to 15 tons of legal payload.
That weight limit is the catch. A tandem bed might hold 16 cubic yards by volume, but if you fill it with wet sand at around 1.5 tons per cubic yard, you'd hit 24 tons, far over the legal cap. So with heavy material, the driver loads to the weight limit, not the volume limit. You'll often see 8 to 12 cubic yards of sand or gravel on a tandem rather than the full bed. We cover that math in the next section.
How many tons fit in a dump truck?
A tandem dump truck legally carries about 12 to 15 tons of material on public roads, regardless of how many cubic yards that turns out to be. Single-axle trucks carry less, usually 6 to 8 tons. The reason tonnage matters more than cubic yards for aggregates is simple: sand, gravel, and dirt are heavy, and weight is the legal limit.
Here's the tradeoff in plain terms. Dry gravel weighs roughly 1.4 tons per cubic yard, and the USGS and most aggregate suppliers use figures in that range. At 1.4 tons per yard, a 15-ton legal load equals only about 10.7 cubic yards, even if the bed could physically hold 16. Light, fluffy materials like mulch fill the bed before they hit the weight cap. Dense materials hit the weight cap first. To convert between weight and volume for your specific material, see our guide on tons to cubic yards.
Dump truck capacity by class: cubic yards, tons, and coverage
The table below pulls it together. Cubic-yard ranges reflect typical bed capacities. Tonnage reflects legal payload limits, which is usually the real constraint for sand and gravel. Coverage assumes a common 3-inch spread depth, a good rule of thumb for driveways and base layers.
| Truck class | Bed volume (cu yd) | Legal payload (tons) | Aggregate load (cu yd) | Coverage at 3" depth |
|---|---|---|---|---|
| Single-axle | 5 to 7 | 6 to 8 | 4 to 6 | ~430 to 645 sq ft |
| Tandem-axle | 10 to 16 | 12 to 15 | 8 to 11 | ~860 to 1,180 sq ft |
| Tri-axle | 15 to 20 | 18 to 22 | 13 to 16 | ~1,400 to 1,720 sq ft |
| Quad/transfer | 18 to 26 | 22 to 26 | 16 to 19 | ~1,720 to 2,040 sq ft |
Two notes on reading this. First, the "aggregate load" column is smaller than "bed volume" because heavy material runs out of legal weight before it runs out of bed space. Second, coverage scales with depth. At 2 inches you cover more ground; at 6 inches you cover roughly half. One cubic yard covers about 162 square feet at 2 inches deep, per standard landscape math.
Why don't you get the full cubic-yard capacity with sand or gravel?
You rarely get a truck's full cubic-yard rating with sand or gravel because weight, not volume, hits the limit first. A tandem bed rated for 16 cubic yards can legally carry only 12 to 15 tons on the road. Since gravel weighs around 1.4 tons per cubic yard, that legal weight tops out near 10 to 11 cubic yards.
Think of it like a moving box. You can fill a box with pillows and close the lid, but fill the same box with books and it gets too heavy to lift before it's full. Aggregates are the books. Overloading is also illegal and unsafe, so reputable suppliers load to the legal weight, period. This is exactly why ordering by tons is more reliable than ordering by "a truckload." A truckload of mulch and a truckload of crushed stone are very different amounts of material.
How do I turn my project size into a load count?
Start with the area you're covering and the depth you need, then convert to volume. A driveway that's 1,000 square feet at 3 inches deep needs about 9.3 cubic yards of material, which fits in roughly one tandem load of gravel. Knowing your volume first tells you how many trucks you'll need and keeps you from over- or under-ordering.
The quick method: multiply length by width to get square feet, then multiply by your depth in feet (3 inches is 0.25 feet), and divide by 27 to get cubic yards. For a worked example on a real project, see how much gravel for a driveway. Once you know your cubic yards, compare against the table above to land on a load count. Most home projects fit in one tandem or tri-axle delivery.
Frequently Asked Questions
How many cubic yards are in a standard dump truck?
A standard dump truck holds 5 to 16 cubic yards depending on its size. Single-axle trucks hold 5 to 7 cubic yards, and the common tandem-axle truck holds 10 to 16. The amount you actually get with heavy material is lower because weight limits cap the load before the bed fills.
How many yards of gravel fit in a tandem dump truck?
A tandem dump truck typically carries 8 to 11 cubic yards of gravel. The bed can hold up to 16 cubic yards by volume, but gravel's weight, around 1.4 tons per cubic yard, hits the truck's 12 to 15 ton legal limit first. That weight cap is what decides your real load.
How many tons is a full dump truck load?
A full tandem dump truck load is about 12 to 15 tons on public roads. Single-axle trucks carry 6 to 8 tons, and tri-axle trucks carry 18 to 22 tons. These figures come from federal and state road weight limits, so they hold true no matter what material you're hauling.
Is it better to order by the yard or by the ton?
For sand, gravel, and dirt, ordering by the ton is more precise because those materials are priced and loaded by weight. Cubic yards work fine for estimating how much space the material will fill on your project. Many suppliers, including WAYS, show both the load size and tonnage when you enter your address.
How many square feet does one dump truck cover?
A tandem load of gravel, about 10 cubic yards, covers roughly 1,080 square feet at 3 inches deep. At 2 inches it covers more, near 1,620 square feet, and at 6 inches about half that. Coverage depends entirely on the depth you spread, so decide your depth before you order.
Get your real delivered price
Capacity charts get you close, but the only number that matters is what shows up at your address. Enter your delivery location on the WAYS products page and you'll see the exact load size, tonnage, and a real delivered price for sand, gravel, or dirt, no callbacks or quote forms. We Are Your Supply, and we'd rather show you the number up front.