How Much Does 13 Tons of River Rock Cover?
How much does 13 tons of river rock cover depends on how deep you spread it. At about 1.35 tons per cubic yard, 13 tons is roughly 9.6 cubic yards. Spread 3 inches deep, that covers about 1,040 square feet. Go thinner and it covers more; go deeper and it covers less.
Volume and tonnage calculator →How the coverage is figured
- Tons to cubic yards: 13 ÷ 1.35 = 9.6 yd³.
- Cubic yards to cubic feet: × 27 = 260 cu ft.
- Divide by depth in feet: at 3 inches (0.250 ft), 260 ÷ 0.250 = 1,040 sq ft.
Coverage of 13 tons at different depths
| Depth | Square feet covered | Square yards |
|---|---|---|
| 2 in | 1,560 | 173 |
| 3 in | 1,040 | 116 |
| 4 in | 780 | 87 |
About river rock
River rock is smooth, water-worn stone sold in sizes from about 3/4 inch to several inches. Larger sizes cover fewer square feet per ton at the same depth because the voids between stones are bigger. Weight runs about 1.25 to 1.45 tons per cubic yard, so treat the table as a planning range rather than an exact figure.
Planning around 13 tons
For delivery, 13 tons is in the range of one full tandem load. Ask the supplier how they will split it. Spread from the pile with a loader, skid steer or wheelbarrow, then rake to depth before compacting if the material calls for it.
- Check depth as you go. Stakes marked at the target depth help keep the spread even.
- Expect some loss. Compaction and uneven ground use more than the flat-math figure. Keep about 10 percent in reserve.
- Ask about moisture. Wet material weighs more, so a ton of it covers less.
To run your own numbers, use the volume and tonnage calculator.
Good and poor uses for river rock
Good uses:
- Dry creek beds and drainage swales
- Decorative borders and planting beds
- Around downspouts to stop splash erosion
Think twice for:
- Walking surfaces
- Driveways
- Bases under slabs or pavers
Quick reference numbers
- Per inch over 100 sq ft: about 0.42 tons of river rock (0.31 cubic yards).
- Per inch over 1,000 sq ft: about 4.2 tons.
- Another size for comparison: a 10x20 area at 3 inches takes about 2.5 tons.
- Weight used here: about 1.35 tons per cubic yard.
Mistakes that throw off the order
- Measuring only the main rectangle. Aprons, turnouts and curved edges add real square footage.
- Ignoring the base. A thin surface layer over soft soil fails early no matter how much material is on top.
- Ordering exactly the math. Uneven ground and spillage nearly always need a little more than the flat calculation.
- Mixing up cubic yards and tons. Yards are volume, tons are weight; convert with the product’s weight per yard.
Questions people ask
How many cubic yards is 13 tons of river rock?
About 9.6 cubic yards at 1.35 tons per yard.
How many square feet does 13 tons of river rock cover at 3 inches?
About 1,040 square feet.
How many square feet does 13 tons cover at 2 inches?
About 1,560 square feet.
How much does a yard of river rock weigh?
About 1.25 to 1.45 tons.
Will 13 tons fit in one truck?
It depends on the truck. Single-axle dump trucks often carry under 10 tons and tandems around 13 to 16; your supplier will know their limits.
Related guides
- How Much Does a Ton of River Rock Cover?
- Tons to Cubic Yards for Gravel: Conversion Chart
- How Many Tons of Gravel in a Dump Truck? Loads and Coverage
- How Much Does 11 Tons of River Rock Cover?
- How Much Does 12 Tons of River Rock Cover?
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