Gravel Calculator - Tons, Cubic Yards, Depth & Concrete Base
Enter the area dimensions. Use Imperial or Metric mode, then adjust individual units if needed.
Last updated: August 2026
Buying and sizing notes
- For driveways and bases, depth and compaction matter as much as total tonnage.
Gravel base questions this calculator answers
Gravel estimates are usually about area, depth, cubic yards, tons, and base thickness. For concrete slabs, the gravel base should be planned separately from the concrete volume.
Gravel under concrete slab
Enter the slab footprint and the planned gravel depth. Common base depths vary by use, soil, drainage, and local conditions, so treat the result as planning only.
Read the gravel-under-slab guideDepth drives tonnage
A 4 inch base uses twice the material of a 2 inch base over the same area. Depth errors are expensive.
Cubic yards vs tons
Volume and weight are not the same. Tons depend on material density, moisture, gradation, and compaction.
Use with concrete bags
For a small slab, estimate gravel base first, then estimate concrete bags from finished slab dimensions and thickness.
How to use this estimate
What this includes
- Area from length and width
- Depth
- Volume
- Density-based tonnage estimate
What it does not include
- Compaction testing
- Drainage design
- Soil correction
- Delivery truck limitations
Common mistakes
- Mixing inches and feet on depth
- Forgetting compaction/settlement
- Assuming every gravel product has the same density
Next steps for this project
Use these related paths when the calculator result turns into a real buying decision, budget, or quote comparison.
Related guide
Use the guide with this calculator when you need more context before buying materials or comparing options.
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