| From: | To: |
To calculate the volume of river rock needed:
\[ V = (A \times d) \times (1 + c) \]
Where:
To calculate the weight of the river rock:
\[ W = V \times \rho \]
Where:
Let's say we want to make a 7.5-cm thick pea gravel (density = 1,788 kg/m³) walkway with a width of 80 centimeters (or 0.8 meters) and a length of 10 meters. Considering a 5% wastage, we estimate our needed river rock volume as follows:
\[ V = (A \times d) \times (1 + c) = ((0.8 \, \text{m} \times 10 \, \text{m}) \times 0.075 \, \text{m}) \times (1 + 5\%) = (0.6 \, \text{m}^3) \times (1 + 0.05) = 0.63 \, \text{m}^3 \]
To find the weight:
\[ W = V \times \rho = 0.63 \, \text{m}^3 \times 1,788 \, \text{kg/m}^3 = 1,126.44 \, \text{kg} \]
We need more than 1,126.44 kg of pea gravel for our walkway project.
The River Rock Formula helps you determine the total volume and weight of river rock needed based on the length, width, depth, wastage percentage, and density of the rock. It is important for planning and purchasing the correct amount of river rock for landscaping projects.
| Stone Material | Tons per Cubic Yard |
|---|---|
| Crushed Stone 1/4″ – 2″ | 1.4 – 1.7 |
| Crushed Stone 2″ – 6″ | 1.5 – 1.7 |
| Cobblestones 4″ – 8″ | 1.3 – 1.6 |
| Rip Rap 6″ – 9″ | 1.7 – 2 |
| Lava Rock 3/8″ – 2″ | 0.65 – 0.9 |
| Boulders | 1 – 1.5 |
| Stone Material | Tons per Cubic Yard |
|---|---|
| Crushed Stone 1/4″ – 2″ | 1.4 – 1.7 |
| Crushed Stone 2″ – 6″ | 1.5 – 1.7 |
| Cobblestones 4″ – 8″ | 1.3 – 1.6 |
| Rip Rap 6″ – 9″ | 1.7 – 2 |
| Lava Rock 3/8″ – 2″ | 0.65 – 0.9 |
| Boulders | 1 – 1.5 |
| Stone Material | Tons per Cubic Yard |
|---|---|
| Crushed Stone 1/4" - 2" | 1.4 - 1.7 |
| Crushed Stone 2" - 6" | 1.5 - 1.7 |
| Cobblestones 4" - 8" | 1.3 - 1.6 |
| Rip Rap 6" - 9" | 1.7 - 2 |
| Lava Rock 3/8" - 2" | 0.65 - 0.9 |
| Boulders | 1 - 1.5 |
Crushed stones come in various sizes, each suited for different applications. Below is a guide to standard crushed stone sizes and their typical uses:
| Stone Size | Common Uses |
|---|---|
| Stone Dust | Concrete block fabrication, wall filling, hole patching, and smooth pavement construction. |
| Up to 1/4" | Barns, ground fillers, horse stables, tennis courts, and walkways. |
| Up to 1/2" | Mixed in asphalt and concrete for roads, water tank beddings, filtration, landscaping, and various environmental applications. |
| Up to 3/4" | Bedding for large pipes, drainage systems, driveways, farm roads, French drains, path fillers, and slab bases. |
| Up to 1" | Ideal for pavements, road bases, and jogging tracks. |
| Up to 1 1/4" | Base material for driveways, rough terrain pads, and temporary paths for heavy-duty trucks at construction sites. |
| Up to 2" | Drainage systems, dry wells, septic systems, and railroad tracks. |
| Up to 4" | Drain outfall areas, heavy-duty haul roads, septic tanks, and slopes. |
