How to use the cubic yards in a dump truck calculator
- 1
Measure the bed length
Measure the inside length of the bed floor.
- 2
Measure the bed width
Measure the inside width of the bed floor.
- 3
Measure the side height
Measure the inside height of the bed walls. For a level load, this is the usable fill height.
- 4
Calculate and adjust
Enter the dimensions to get the geometric cubic yards, then enter a usable fill percentage if the bed will not be filled level to the top.
Formula
Geometric cubic yards = length x width x side height / 27
Multiply the three bed dimensions in feet to get cubic feet, then divide by 27 for cubic yards. This is the geometric bed volume, not the legal payload capacity.
Worked example
A bed measures 12 feet long, 7 feet wide, and 1.5 feet of side height.
- 1Multiply the dimensions: 12 x 7 x 1.5 = 126 cubic feet.
- 2Divide by 27: 126 / 27 = 4.67 cubic yards.
The geometric bed volume is about 4.67 cubic yards, filled level to the top of the walls.
Why capacities vary
Two trucks of the same class can carry different loads because capacity depends on many factors:
- Bed length, width, and side height
- Material density, which sets the weight per cubic yard
- The truck payload rating
- Axle and gross vehicle weight limits
- Legal limits for the road and jurisdiction
- How the load is filled, level or heaped
Volume limited versus weight limited materials
Light, bulky materials such as mulch usually fill the bed before they reach the weight limit, so they are volume limited. The geometric volume is the main constraint.
Heavy materials such as wet sand, gravel, or stone reach the weight limit long before the bed is full, so they are weight limited. For these, the legal payload, not the bed volume, decides how much the truck can carry. Use the cubic yards to tons calculator with a confirmed density to check the weight of a load.
How to measure a truck bed
Measure the inside of the bed for an accurate volume:
- 1Measure the inside floor length from the cab end to the tailgate.
- 2Measure the inside floor width between the walls.
- 3Measure the inside wall height from the floor to the top of the side.
- 4Enter all three in the same unit, then adjust for a partial or heaped load.
Partial and heaped loads
A level load fills the bed exactly to the top of the side walls, which is what the geometric volume assumes. If the bed is only partly filled, enter a usable fill percentage to scale the volume down.
A heaped load rises above the walls in a mound. Heaping adds volume, but how much depends on the material and how it is loaded, so it cannot be stated as a fixed figure. Treat any heaped estimate cautiously and confirm with your supplier.
Common mistakes
Avoid these errors when estimating truck capacity:
- Treating geometric bed volume as the legal payload
- Ignoring the weight limit for heavy materials
- Measuring the outside of the bed instead of the inside
- Assuming a standard capacity for a truck class without measuring
- Counting on a heaped load as if it were guaranteed volume
Delivery tickets and verification
Suppliers usually record deliveries by weight on a delivery ticket, even for materials you think of by volume. Comparing the ticket weight against a calculated volume needs the right material density, and small differences are normal.
Always confirm payload ratings, axle limits, and legal road limits with the vehicle manufacturer, operator, supplier, and applicable regulations before loading. To check the weight side, see how many cubic yards are in a ton.
Bed Dimension Examples (Mathematical)
Geometric volume for example bed dimensions, filled level to the top of the walls. These are mathematical examples to show how bed size affects volume, not standard truck capacities. Measure your own bed and confirm payload limits.
| Example bed (L x W x side height) | Geometric cubic feet | Geometric cubic yards | Cubic meters |
|---|---|---|---|
| Example A: 8 x 5 x 1 ft | 40 | 1.48 | 1.13 |
| Example B: 12 x 7 x 1.5 ft | 126 | 4.67 | 3.57 |
| Example C: 14 x 8 x 2 ft | 224 | 8.3 | 6.34 |
| Example D: 16 x 8 x 4 ft | 512 | 18.96 | 14.5 |
Frequently asked questions
- How many cubic yards does a dump truck hold?
- It depends on the bed size and the material. Measure the bed length, width, and side height and divide the product by 27 for the geometric volume. The amount a truck can legally carry also depends on weight limits.
- Is bed volume the same as payload capacity?
- No. Bed volume is the space inside the bed. Payload capacity is limited by the truck rating, axle limits, and legal limits, and is often reached before the bed is full for heavy materials.
- How do I calculate dump truck volume?
- Multiply the inside bed length, width, and side height in feet, then divide by 27 to get cubic yards.
- Why can't you give one standard capacity?
- Because beds differ in size, materials differ in weight, and legal limits differ by jurisdiction. A single number would be misleading.
- What is a level load versus a heaped load?
- A level load fills the bed to the top of the walls. A heaped load mounds above the walls. Heaping adds volume that varies with the material, so it cannot be stated exactly.
- How does material weight affect capacity?
- Heavy materials reach the truck weight limit before the bed is full, so the legal payload, not the bed volume, sets the limit.
- Should I measure the inside or outside of the bed?
- Measure the inside, since that is the space the material actually fills.
- How do I check the weight of a load?
- Convert the volume to tons using a confirmed material density with the cubic yards to tons calculator, then compare against the truck payload rating.
Geometric bed volume is length times width times side height in feet, divided by 27. YardCalc does not publish standard truck capacities, since real capacity depends on payload ratings, axle limits, and legal limits that must be confirmed for each vehicle. See the YardCalc calculation methodology.
Results are planning estimates. Last reviewed 2026-06-16.