Gravel Blanket Calculator
Enter the blanket area and thickness to calculate the graded gravel volume and weight (tonnes) for foundations, drainage and landscaping.
Input Data
Results
At a glance:Gravel blanket volume = area × thickness (mm) ÷ 1000 × (1 + waste%). Weight = volume × gravel density ÷ 1000 (tonnes). Graded gravel is used as a foundation support, drainage and landscaping base; compacted density is about 1,400–1,600 kg/m³. The calculator estimates bulk material only.
Formula
Volume = area × thickness/1000 × (1 + waste%)
Weight = volume × density / 1000
$$V = A\frac{t}{1000}(1+w)$$$$M = \frac{V\rho}{1000}$$How to Use
- Enter the blanket area (m²).
- Enter the blanket thickness (mm).
- Confirm the gravel density and waste.
- The tool outputs the volume and weight.
Case Studies
Foundation support layer
50 m², 100 mm thick, density 1,500, waste 10%.
Volume 5.5 m³; weight about 8.25 t.
Landscape drainage layer
30 m², 50 mm thick, density 1,500.
Volume 1.65 m³; weight about 2.48 t.
FAQ
Is gravel different from stone dust?
Graded gravel has mixed particle sizes and drains well; stone dust is fine and drains poorly. Bedding layers usually use graded gravel for load and drainage.
How thick should it be?
Depending on use: landscape decoration 30–50 mm, foundation support 100–150 mm, driveway sub-base thicker.
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References
Content review: Calculatorism Construction Team. Results are for reference only; please refer to the relevant authorities for the official figures.