Gravel Calculator
Planning a landscaping project shouldn't involve guesswork. Our Gravel Calculator provides precise estimates for volume and weight, ensuring you order exactly what you need for your driveway, garden path, or drainage project.
Pro Tip: Always order 5-10% extra to account for compaction and uneven sub-surfaces. It's much cheaper to have a little left over than to pay for a second delivery.
- Calculates both volume (yards) and weight (tons)
- Adjustable material density for different rock types
- Works for rectangular and square coverage areas
How to Calculate Gravel Needs
Calculating the amount of gravel required for a project involves three primary dimensions: length, width, and depth. Because gravel is sold by volume (cubic yards) or weight (tons), you first need to determine the total cubic volume of the space you intend to fill.
The basic formula is: Length (ft) × Width (ft) × Depth (ft) = Total Cubic Feet. Since there are 27 cubic feet in a cubic yard, you divide your total cubic feet by 27 to get the final yardage. Our tool automates this process, converting your depth from inches to feet automatically to ensure the units remain consistent.
Converting Volume to Weight (Tons)
While volume tells you how much space the gravel will take up, many suppliers sell by the ton. Converting cubic yards to tons requires knowing the density of the material. A standard rule of thumb for landscaping gravel is that 1 cubic yard weighs approximately 2,800 to 3,000 pounds (1.4 to 1.5 tons).
However, different materials have different weights. Crushed limestone is denser than volcanic rock, and wet sand is significantly heavier than dry sand. By selecting your material type in our calculator, we apply a specific density factor (measured in pounds per cubic foot) to provide a more accurate tonnage estimate for your specific purchase.
Standard Depths for Common Projects
Choosing the right depth is critical for both the functionality and the budget of your project. Here are common industry standards:
- Walkways and Paths: 2 to 4 inches. This provides a comfortable walking surface without feeling too "deep" or unstable.
- Driveways: 4 to 6 inches for the surface layer. Most driveways require a total of 8-12 inches of base material, but the decorative gravel top is usually thinner.
- Drainage/French Drains: 12 inches or more. These often require filling a deep trench with gravel to allow for high-volume water flow.
- Decorative Mulching: 2 inches. If you are just using stones to prevent weeds and look nice, a thin layer is sufficient.
Practical Calculation Examples
Small Garden Path
A path that is 20 feet long, 3 feet wide, and 3 inches deep.
- Volume: 0.56 Cubic Yards
- Weight: ~0.78 Tons
- Tip: Round up to 1 ton if the supplier has a minimum delivery.
Standard Driveway
A driveway that is 40 feet long, 12 feet wide, and 4 inches deep.
- Volume: 5.93 Cubic Yards
- Weight: ~8.30 Tons
- Tip: Ask for a "tri-axle" delivery for better rates on this volume.
Common Gravel Type Densities
| Material Type | Lbs per Cubic Yard | Tons per Cubic Yard |
|---|---|---|
| Crushed Stone (Clean) | 2,500 - 2,700 lbs | 1.25 - 1.35 Tons |
| Pea Gravel | 2,800 lbs | 1.4 Tons |
| River Rock | 2,600 lbs | 1.3 Tons |
| Stone Dust / Screenings | 2,400 lbs | 1.2 Tons |