Gravel calculator
Type the area, the layer depth and the gravel density: you get the m³, the tonnes to order and the cost.
Result
1.68 tGravel to order
- Volume
- 1.05 m³
- Estimated cost
- 75.60
Inputs
- Area
- 20
- Depth
- 5
- Loose gravel density
- 1.6
- Margin (settling, losses)
- 5
- Price per tonne (optional)
- 45
How it is calculated
Volume = area × depth (in m) × (1 + margin).
Result
Gravel to order
- Volume
- 1.05 m³
- Estimated cost
- 75.60
How it is calculated
- Volume = area × depth (in m) × (1 + margin).
- Weight = volume × loose density (t/m³). Cost = tonnes × price per tonne.
Example
20 m² at 5 cm with a 5 % margin: 1.05 m³ × 1.6 = 1.68 t, so 75.60 at 45 per tonne.
Good to know
- Density depends on the rock, grain size and moisture: ask your supplier.
- Usual depths: 3 to 5 cm for a footpath, 5 to 10 cm for a driveway on a sub-base.
- Density accepted between 0.5 and 3 t/m³.
Sources
- Usual loose bulk densities of aggregates (about 1.4 to 1.8 t/m³)
Frequently asked questions
What is this tool used for?
Type the area, the layer depth and the gravel density: you get the m³, the tonnes to order and the cost.
How is the result calculated?
Volume = area × depth (in m) × (1 + margin).
What should I check before using the result?
Density depends on the rock, grain size and moisture: ask your supplier.