Gravel Project Simulator
Calculate precise tonnage with built-in engineering physics for compaction and slope.
Recommended Order
Volume Breakdown
| Project Area | 0 sq ft |
| Target Volume (Compact) | 0.00 yd³ |
| Order Volume (Loose) | 0.00 yd³ |
Engineering Data
| Material Density | 105 lb/ft³ |
| Compaction Factor | 1.0x |
| Slope Correction | Flat |
Why Use a Project Simulator?
Most gravel calculators just multiply Length × Width × Depth. That works for water, but not for dirt and stone. This tool applies civil engineering principles to ensure you order enough material to handle Compaction and Slope.
1. The "Shrinkage" Factor
When you buy gravel, it is "loose" (full of air). When you install it and run a plate compactor over it, it shrinks.
- Crushed Stone: Shrinks by ~35%. If you order exactly 4 inches, you'll end up with 3 inches. Our tool accounts for this.
- Pea Gravel: Shrinks less (~10%) but doesn't lock together.
2. Slope Physics
Gravity affects your material needs. A sloped driveway has more surface area than a flat map suggests. Furthermore, putting round stone (Pea Gravel) on a slope >10% is dangerous as it will roll. Use angular stone instead.
3. Calculation Formula
We use the "Order Volume" formula:
Frequently Asked Questions
How much does a yard of gravel weigh?
On average, one cubic yard of standard gravel weighs about 2,800 lbs or 1.4 tons. However, this varies by material. Crushed stone is denser than River Rock.
Why is my estimate higher than other calculators?
Because other calculators are likely wrong. They calculate the "hole volume," not the "material volume." If you don't account for compaction (shrinkage), you will run short and have to pay for a second delivery.
What is MOT Type 1?
MOT Type 1 is a specific granular sub-base material used for driveways and roads. It ranges from 40mm rocks down to dust, allowing it to compact extremely hard.