Gravel Project Simulator

Calculate precise tonnage with built-in engineering physics for compaction, slope, and density.

Project Shape
Rectangle
Circle

Recommended Order

0 Tons
Stability Warning: Round aggregate on a steep slope acts like ball bearings. Consider Crushed Stone or Grids.
Physics Applied: Added 0% extra volume to account for Material compaction.

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:

V(order) = (Area × Depth) × SlopeFactor × CompactionFactor