Key Takeaways
- Legal axle weight limits usually set the capacity, not the truck bed size
- A tandem axle dump truck typically carries 10 to 14 tons for residential deliveries
- Dense materials hit weight limits with empty space; light materials fill the bed but stay under limits
- Ask your supplier for capacity in tons for your specific material, not generic yards
- The tons calculator includes a delivery panel for load planning
This calculation follows standard aggregate industry methodology.
Cubic yard is a unit of volume equal to a cube measuring 3 feet on each side, commonly used in the US for ordering gravel and other aggregates.
Density in gravel calculations refers to the weight of material per unit volume, typically measured in tons per cubic yard or tonnes per cubic metre.
It depends on the truck and, more than most people expect, on the legal weight limit for its axles rather than how much physical space the bed has. That’s not a dodge: it’s the actual mechanism, and it’s why the same truck can carry noticeably fewer cubic yards of a dense crushed stone than it carries of a light decorative rock, even though the bed is the same size both times.
Rough capacities, as a starting point
These are common vehicle classes, not a guarantee. Ask your supplier what their trucks actually carry.
- Pickup truck: around 1 ton, maybe a cubic yard and a half. Fine for a small bed or a bag-replacement quantity.
- Single axle dump truck: roughly 5 to 7 tons.
- Tandem axle dump truck: roughly 10 to 14 tons, the common size for a residential driveway delivery.
- Tri-axle dump truck: 15 tons or more, used for larger jobs where fewer trips is worth the bigger vehicle.
Why weight, not volume, usually sets the limit
Roads and bridges are rated for axle weight, and that rating exists to protect the infrastructure, not the truck. A tandem axle truck has a legal weight ceiling regardless of how much room is left in the bed. Load it with a dense material and you hit that ceiling with visible space still empty. Load it with something light and you can fill the bed completely and still be under the legal limit.
This is the actual reason a truck’s “capacity” isn’t one number: it’s a function of what’s being carried. A truck that legally carries 14 tons of a 1.4 ton-per-cubic-yard crushed stone (about 10 cubic yards) could carry closer to 20 cubic yards of a light material like lava rock at roughly 0.55 tons per cubic yard, weight permitting, if the bed were physically large enough to hold it. In practice the bed size and the weight limit are usually matched for the truck’s most common cargo, but the principle is worth knowing when you’re ordering something unusually light or heavy.
What this means for planning a delivery
Ask for the capacity in tons for the specific material you’re ordering, not a generic “yards” figure, because the yards figure implicitly assumes a density that may not be yours. Once you have tons, working out the number of loads is straightforward: total tons needed divided by tons per load, rounded up, since a truck either makes the trip or it doesn’t.
The tons calculator and the driveway calculator both include a delivery panel that does exactly this division for you: enter the capacity your supplier quotes and it returns the number of loads, how full the last one is, and how much capacity you’re paying for but not using if the quantity doesn’t divide evenly.
Editorial note: This article is reviewed for accuracy and updated regularly. All calculations use standard industry formulas. For the latest density figures, consult your gravel supplier directly.
Frequently asked questions
How many cubic yards of gravel fit in a pickup truck?
A standard pickup truck holds about 1 to 1.5 cubic yards of gravel, depending on the bed size and the material’s density. For lighter materials, you can fill the bed completely; for dense crushed stone, the weight limit may be reached before the bed is full.
How many loads do I need for a 20 ton driveway?
A tandem axle dump truck typically carries 10 to 14 tons per load, so a 20 ton order would require 2 loads. The exact number depends on your truck’s weight capacity and the specific material you’re ordering.
Why does the same truck carry different amounts of different materials?
Road and bridge weight limits are based on axle weight, not volume. Dense materials like crushed stone hit the weight limit with space still empty in the bed. Lighter materials like lava rock can fill the entire bed while staying under the legal weight limit.
How do I know how many loads my delivery needs?
Divide the total tons needed by the truck’s capacity in tons, then round up. The driveway calculator includes a delivery panel that does this calculation automatically and shows how full the last load will be.