Gravel Calculator
Enter the gravel type (or custom density), laying length, width and depth to calculate the area, volume, weight and cost of gravel.
Input Data
Results
At a glance:Gravel quantity follows volume = area × depth and weight = volume × density. Densities differ a lot by type and moisture; dry gravel is lighter than wet, and decorative stones such as Cotswold gold or dolomite are heavier. Cost is weight in tonnes × price per tonne. Because gravel compacts and some is lost at edges, order 5–10% extra. This calculator estimates bulk material only and excludes geotextile, edging and delivery.
Formula
Area = length × width
Volume = area × depth
Weight = volume × density
Total cost = weight (t) × price per tonne
$$A = L \cdot W$$$$V = A \cdot t$$$$M = V \cdot \rho$$$$C = \frac{M}{1000} \cdot p$$How to Use
- Select a gravel type (if unsure, choose 'Crushed stone' or 'Regular gravel').
- Enter the laying length and width (m).
- Enter the laying depth (cm).
- To estimate cost, enter the price per tonne of gravel.
- The tool outputs the area, volume, weight and total cost.
- When ordering, add 5–10% allowance to the weight.
Case Studies
Garden path
10 m × 1 m × 5 cm, regular 1,346 kg/m³.
Area 10 m²; volume 0.5 m³; weight 673 kg; at HKD 150/t about HKD 101.
Driveway base
10 m × 5 m × 12 cm, crushed stone 1,600 kg/m³.
Area 50 m²; volume 6 m³; weight 9,600 kg; at HKD 130/t about HKD 1,248.
FAQ
What depth of gravel do I need?
Walkways about 5 cm, driveways 10–15 cm to spread load and resist rutting; heavier vehicles need more.
Why does moisture change the weight?
Wet gravel holds water in the voids and can be 20–30% heavier than dry, so the delivered tonnage differs from the dry estimate.
Related Tools
References
Content review: Calculatorism Science Team. Results are for reference only; please refer to the relevant authorities for the official figures.