A cubic yard is a volume, not a fixed weight. Gravel weight varies with material, gradation, moisture, voids and compaction. The defensible conversion is to multiply 27 cubic feet per cubic yard by an appropriate bulk density for the actual material and condition.
Why a cubic yard does not have one universal gravel weight
A cubic yard is fixed volume; weight depends on bulk density. The reference is most useful when it shows the conversion method and the reasons the density can change.
| Quantity | Relationship | Interpretation |
|---|---|---|
| 1 cubic yard | 27 cubic feet | Fixed volume conversion |
| Weight | volume × bulk density | Requires density for the actual material |
| Bulk density | mass ÷ bulk volume | Affected by material/gradation/voids/moisture |
| Supplier ticket | Project-specific sale quantity | Preferred evidence for purchased material |
One cubic yard, variable weight
Volume is fixed. Bulk density is not.
What matters
- Formula: pounds per cubic yard = density in lb/ft³ × 27.
- Tons per cubic yard = pounds per cubic yard ÷ 2,000 for US short tons.
- Use a supplier or project density when accuracy matters.
- FHWA guidance emphasizes that project-specific measured material inputs are preferred over typical values for final design.
How to use this page
Use the page as a decision or verification layer, then follow the linked calculator when you need project-specific arithmetic. Values that vary by product, moisture, local rule or job condition are identified as variables rather than presented as universal facts.
For work controlled by plans, specifications, permits, manufacturer instructions or professional design, those project-specific documents take precedence over this general reference.
Sources
Sources support the scoped statements on this page; they do not imply local approval or product suitability.
Public corpus v1 · Method and scope reviewed for launch on 2026-08-13.
How much does a yard of gravel weigh? Use density as a range or project-specific input
A cubic yard tells you volume, not weight. Gravel weight per yard changes with rock type, particle-size distribution, fines, moisture and void space. The reliable method is to keep the cubic-yard quantity visible and pair it with a bulk-density value that applies to the material being purchased.
Volume and weight answer different questions
One cubic yard is exactly 27 cubic feet of volume. Weight is calculated only after a density is applied to that volume. Because bulk aggregate contains voids between particles, the density of solid rock is not the same thing as the bulk density of a loose or compacted aggregate.
This is why a single “tons per yard” number should not be treated as universal.
weight = volume × bulk densityWhat changes bulk density
Particle shape and gradation change how efficiently the material packs. Fines can fill voids; moisture adds mass; compaction changes the volume occupied by a given mass. Supplier stockpiles can also vary over time.
For ordering, use the supplier’s conversion or a density applicable to the exact material whenever possible. If only a typical range is available, keep the result labeled as an estimate.
Use the reference with a quantity calculator
First calculate the project volume from area and depth. Then, only if the supplier sells by weight or trucking capacity matters, convert that volume using the appropriate density assumption.
Do not reverse the process by choosing a generic tons-per-yard value and letting it silently determine the volume.
Verify before you use the result
- Identify the material before using a density.
- Keep moisture and compaction context visible.
- Prefer supplier or specification data for ordering decisions.
Questions that come up before the next step
How many cubic feet are in a yard of gravel?
A cubic yard contains 27 cubic feet. That is a fixed volume conversion.
Why does a cubic yard of gravel have different weights?
Bulk density changes with material type, gradation, moisture, particle shape and void space.
Should I order gravel by yards or tons?
Use the unit your supplier sells and delivers, but preserve the project volume calculation. If converting between volume and weight, document the density or supplier conversion used.
Primary and official references
Sources support the method and scope boundaries; project-specific requirements still need applicable product, supplier or local documentation.
Aggregate categories, production and official commodity information.
Why gradation, particle properties and project specification matter for base and subbase materials.