Gravel Calculator
Estimate area, volume, weight, and cost. Price per mass and price per volume stay coupled through density.
Gravel Specification
Using density: —
How much gravel do I need?
Enter dimensions, or enter area directly. Then add depth, or enter volume directly. Weight can also be entered directly.
If you edit Area directly, it becomes the source instead of Length × Width.
How much will the gravel cost me?
—
Edit either price field. The other side updates automatically from the current density and units.
After the first calculation, changing any input or unit recalculates automatically.
Step-by-step derivation
Enter your values, then click Calculate.
References
- Area: A = length × width
- Volume: V = A × depth
- Weight: W = ρ × V
- Price coupling: (Currency/volume) = (Currency/mass) × ρ, with proper unit conversions
Use this Gravel Calculator to estimate the volume, weight, and optional cost of gravel needed for a driveway, path, landscaping area, drainage project, or other rectangular area.
Gravel Calculation Method
Area = length × width
Volume = area × depth
Weight = volume × gravel density
If your supplier charges by weight:
Total cost = gravel weight × price per weight unit
If your supplier charges by volume:
Total cost = gravel volume × price per volume unit
Example
Suppose an area is 10 m long, 4 m wide, and requires gravel 10 cm deep. Use a gravel density of 1,680 kg/m³.
Area = 10 × 4 = 40 m²
Depth = 10 cm = 0.10 m
Volume = 40 × 0.10 = 4 m³
Weight = 4 × 1,680 = 6,720 kg
The project therefore requires approximately 4 m³, or 6.72 metric tonnes, of gravel using this density.
Important Notes
- Use the gravel density provided by your supplier whenever possible.
- Gravel density varies with stone type, particle size, moisture, void space, and whether the material is loose or compacted.
- Actual quantity may differ because of compaction, settling, uneven ground, and variations in installation depth.
- For irregular areas, divide the project into smaller sections or enter the known total area directly.
- For structural bases, drainage systems, or engineered fill, follow the specified material type, depth, and compaction requirements.