Gravel Calculator
Calculating the amount of gravel needed for your project is crucial to ensure you have enough material and avoid costly mistakes. Our gravel calculator makes this process easy and accurate.
- Enter the length, width, and depth of the area you want to cover with gravel.
- Select the density of the gravel you plan to use.
- Click the ‘Calculate’ button.
- View your results and a visual representation of your calculation.
The formula we use to calculate the amount of gravel needed is:
Volume (ft³) = Length (ft) × Width (ft) × Depth (ft)
Weight (lb) = Volume (ft³) × Gravel Density (lb/ft³)
Real-World Examples
Let’s look at three case studies:
Case Study 1: A patio measuring 10ft x 12ft with a depth of 2 inches (0.167ft) using gravel with a density of 120 lb/ft³.
Case Study 2: A walkway measuring 5ft x 3ft with a depth of 3 inches (0.25ft) using gravel with a density of 140 lb/ft³.
Case Study 3: A driveway measuring 20ft x 15ft with a depth of 4 inches (0.333ft) using gravel with a density of 100 lb/ft³.
Data & Statistics
| Gravel Type | Average Density (lb/ft³) |
|---|---|
| Pea Gravel | 100 |
| Crushed Stone | 120 |
| River Rock | 140 |
| Depth (inches) | Coverage (ft²/ton) |
|---|---|
| 1 | 80 |
| 2 | 40 |
| 3 | 27 |
Expert Tips
- Always add a 10% contingency to your calculation to account for waste and unexpected factors.
- Consider the compaction of the gravel. Loose gravel takes up more space than compacted gravel.
- Use our calculator to estimate the cost of your gravel by multiplying the weight by the price per ton.
What is the difference between pea gravel and crushed stone?
Pea gravel is more rounded and smooth, while crushed stone has more angular and jagged edges.
How deep should I lay gravel?
The depth of your gravel layer depends on its intended use. A general rule of thumb is 2-4 inches for pathways and 4-6 inches for driveways.
For more information on gravel types and uses, see the Purdue University Extension and the Bureau of Land Management.