If you have ever stared at an order form wondering whether to buy by the cubic yard or by the ton, here is the short version. A cubic yard is a measure of volume, the space the material fills. A ton is a measure of weight, how heavy it is. They are not interchangeable, but for most landscape rock and decomposed granite, one cubic yard weighs roughly 1.3 to 1.5 tons. Knowing which unit applies, and how they convert, keeps you from over or under ordering.
Volume versus weight
A cubic yard is a cube three feet on each side, which works out to 27 cubic feet of space. It tells you how much area a material will cover at a given depth, no matter how heavy it is.
A ton is 2,000 pounds. It tells you nothing about how much space the material takes up, only how much it weighs. A ton of feathers and a ton of rock weigh the same but fill wildly different volumes. That is why you cannot simply swap the two units without a conversion.
Why rock sells by the ton and mulch by the yard
Heavy materials like landscape rock, gravel, river rock, and decomposed granite are usually sold by the ton because weight is the honest way to price and haul dense material. Trucks are limited by weight, and stone is heavy, so the ton is the natural unit. It also keeps pricing consistent, since a yard of rock can weigh more or less depending on stone size and moisture.
Light, fluffy materials like bark mulch and topsoil are usually sold by the cubic yard because they are bulky but not heavy. A cubic yard of mulch might weigh only a few hundred pounds, so charging by weight would be confusing and pricing by volume makes more sense.
How much one cubic yard weighs, by material
There is no single conversion number, because the answer depends entirely on what you are buying. These are the working figures we use in our own calculator:
| Material | Approx. weight per cubic yard | Tons per cubic yard |
|---|---|---|
| Sand | about 3,000 lb | about 1.5 |
| River rock | about 2,900 lb | about 1.45 |
| Landscape rock | about 2,800 lb | about 1.4 |
| Decomposed granite | about 2,700 lb | about 1.35 |
| Landscape gravel and pea gravel | about 2,700 lb | about 1.35 |
| Topsoil | about 2,000 lb | about 1.0 |
| Bark mulch | about 700 lb | about 0.35 |
Notice the spread. A cubic yard of sand weighs more than four times what a cubic yard of bark mulch weighs. That is the whole reason a single "yards to tons" number does not exist, and why the unit a supplier quotes in tells you something about the material itself.
Moisture moves these numbers too. Material that has been rained on weighs more per yard than the same material dry, which is worth knowing if you are comparing two quotes taken in different weather.
The rough conversion
For most landscape rock and DG, plan on about 1.3 to 1.5 tons per cubic yard. The exact figure shifts with stone type, size, and how wet it is, so treat it as a planning range, not a precise constant. Mulch is far lighter, often well under half a ton per cubic yard, which is exactly why it is sold by volume instead.
When in doubt, do not convert by hand. The coverage calculator takes your area and depth and works out the quantity in the right unit for the material, so you never have to juggle tons and yards yourself.
How far a cubic yard goes
Coverage comes down to depth. The deeper you spread, the less area one cubic yard covers. Here is the rough math for a single cubic yard, since a yard is 27 cubic feet.
| Depth | Approximate coverage per cubic yard |
|---|---|
| 1 inch | about 300 square feet |
| 2 inches | about 150 square feet |
| 3 inches | about 100 square feet |
| 4 inches | about 80 square feet |
These are approximate. Real coverage varies with how the material settles and compacts, so use them to plan and confirm with the calculator before you order.
Working out the amount for your material
Once you understand the units, the next step is the quantity for the specific material you are buying. Each of these walks through a full worked example:
- How much landscape rock do I need
- How much decomposed granite do I need
- How much river rock do I need
- How much sand do I need
- How much flagstone do I need
- How much bark mulch do I need
If you are still deciding what to buy rather than how much, types of landscape rock compares the main options and landscape rock sizes explained covers how grade affects both coverage and look.
Ordering and delivery
Once you know your quantity, the next question is getting it to you. Bulk rock and DG arrive by truck, and how much you can take depends on access and weight limits. Our guide on how landscape rock is delivered covers what to expect. For large or long-distance loads, rates vary by distance and weight, so request a quote and we will work out freight for your address.
Frequently asked questions
What is the difference between a cubic yard and a ton?
A cubic yard measures volume, the amount of space material fills. A ton measures weight, 2,000 pounds. They describe different things, so converting between them depends on how heavy the material is.
How many tons are in a cubic yard of rock?
For most landscape rock and decomposed granite, figure roughly 1.3 to 1.5 tons per cubic yard. The exact number depends on stone type, size, and moisture, so treat it as a planning range.
How many yards are in a ton?
It is the same conversion in reverse, so it depends on the material. For landscape rock at about 1.4 tons per cubic yard, one ton is roughly 0.7 cubic yards. For bark mulch at about 0.35 tons per cubic yard, one ton is closer to 3 cubic yards.
Why is mulch sold by the yard but rock sold by the ton?
Mulch is bulky but light, so pricing by volume (the cubic yard) makes sense. Rock is dense and heavy, and trucks are limited by weight, so pricing by weight (the ton) is the natural unit.
How much area does a cubic yard cover?
A cubic yard covers roughly 100 square feet at 3 inches deep, about 150 at 2 inches, and about 300 at 1 inch. These are approximate; the coverage calculator gives an exact figure for your job.
Does wet material weigh more per yard?
Yes. Material that has absorbed rain weighs noticeably more per cubic yard than the same material dry. It is worth keeping in mind when you compare quotes taken at different times or from different yards.
Do I have to convert tons to yards myself?
No. Enter your area and depth into the coverage calculator and it returns the quantity in the correct unit for the material you chose, so you never have to do the conversion by hand.
Get the materials
Start with the coverage calculator to turn your dimensions into a real quantity in the right unit, then browse landscape rock, decomposed granite, river rock, gravel, or sand. For bulk loads or long-distance delivery, request a quote. We deliver nationwide from our California yards.