Cubic yards to tons conversion
Cubic yards measure volume and tons measure weight, and the two only convert into each other through a material's density, which is why the same volume of mulch and gravel can weigh such different amounts. Getting this conversion right matters most when comparing a per ton supplier quote against a per cubic yard quote from somewhere else, since the two numbers cannot be compared directly without it.
Why this conversion is not one fixed number
Unlike a pure unit conversion like feet to inches, cubic yards to tons depends entirely on what material is being measured. A cubic yard of wood mulch weighs around 0.2 tons, while a cubic yard of gravel weighs around 1.4 tons, seven times as much for the identical volume. Any conversion has to start from the material's density, not a single universal factor.
Approximate density by material
Wood mulch and cedar mulch sit around 0.2 tons per cubic yard, the lightest materials in a typical garden calculator. Compost is close to 0.5 tons per cubic yard. Garden soil and topsoil are close to 1.0 to 1.05 tons per cubic yard. Sand, 3/4 inch gravel, pea gravel, and river rock all fall in a similar heavier range, roughly 1.3 to 1.4 tons per cubic yard. These are dry weight averages; moisture content can shift the real weight of any of them, sometimes significantly for soil and compost after rain.
Converting cubic yards to tons
Multiply the number of cubic yards by the material's density to estimate tons. Three cubic yards of topsoil at roughly 1.0 tons per cubic yard comes out to about 3 tons. Two cubic yards of 3/4 inch gravel at roughly 1.4 tons per cubic yard comes out to about 2.8 tons.
Converting tons to cubic yards
Divide the quoted tons by the material's density to estimate cubic yards. A supplier quoting 5 tons of pea gravel, at roughly 1.3 tons per cubic yard, works out to about 3.8 cubic yards, useful for checking that a tonnage quote actually matches the volume your bed calculation says you need.
Why suppliers quote differently
Heavier bulk materials like gravel, sand, and stone are more often sold by the ton, since weight is what determines truck capacity and delivery cost for dense material. Lighter organic materials like mulch and compost are more often sold by the cubic yard, since volume is the more practical unit for a material where a truck reaches its volume limit well before its weight limit. Knowing both units, and how to move between them, means either quote format can be evaluated on equal footing.
Skip the manual math
The gravel and mulch calculator returns weight in tons alongside cubic yards for whichever of the nine supported materials you choose, calculated from your actual bed measurements and depth rather than a generic average.
Approximate Cubic Yards to Tons by Material
Use these dry-weight averages to compare cubic yard quotes with ton quotes for common landscape materials.
| Material | Tons per cu yd | 2 cu yd total |
|---|---|---|
| Wood mulch | 0.2 tons | 0.4 tons |
| Cedar mulch | 0.2 tons | 0.4 tons |
| Compost | 0.5 tons | 1.0 tons |
| Topsoil | 1.0 to 1.05 tons | 2.0 to 2.1 tons |
| Pea gravel | 1.3 tons | 2.6 tons |
| 3/4 in gravel | 1.4 tons | 2.8 tons |
| River rock | 1.3 to 1.4 tons | 2.6 to 2.8 tons |
Multiply cubic yards by the tons per cubic yard number, or divide tons by that same number to estimate cubic yards.