gravel calculator
Estimate a rectangular layer of gravel with your chosen density.
Formula
V = length × width × depth × (1 + allowance/100); tonnes = V × density/1000
Length: 20 ft · Width: 10 ft · Layer depth: 4 in · Bulk density (example): 100 lb/ft³ · Volume with allowance ≈ (20 ft × 0.3048 m/ft)×(10 ft × 0.3048 m/ft)×(4 in × 0.0254 m/in)×(1+(5)÷100) · Cubic yards ≈ (1.982179261)÷0.9144^3 · Metric tonnes ≈ (1.982179261)×(100 lb/ft³ × 16.01846337 kg/m³/lb/ft³)÷1000
How to use
- Enter length, width and depth.
- Replace the example density with supplier data.
- Set the allowance and read volume and mass.
Examples
- 5 × 4 × 0.1 m at 1600 kg/m³ gives 2 m³ and 3.2 tonnes.
Frequently asked questions
Is the example density fixed?
No. Gravel density varies; use the bulk density for the delivered or compacted state.
Does this include compaction?
Only if your chosen density, depth and allowance account for it.
Which ton is shown?
A metric tonne is 1000 kg; it is not a US short ton.
Sources
Updated: