Patio Gravel Calculator
Estimate the gravel base for a patio — whether a loose gravel patio or a compacted crushed-stone base under pavers. Enter the area and depth to get cubic yards and tonnes.
Patio Gravel Calculator Tool
How much gravel for a patio base?
A paver or slab patio needs a compacted crushed-stone base, usually topped with a thin sand setting layer. A typical base depth is 4 inches (10 cm) for foot-traffic patios, more for poor soil.
- Measure the patio length × width.
- Set the base depth — 4 inches (10 cm) is standard; 6 inches for soft or clay soil.
- The calculator returns the crushed stone needed in cubic yards and tonnes.
Patio build-up
| Layer | Material | Depth |
|---|---|---|
| Base | 3/4" crushed stone / crusher run | 10 cm (4 in) |
| Setting bed | Coarse sand or stone dust | 2.5 cm (1 in) |
| Surface | Pavers / slabs / loose gravel | — |
Compact the base in layers and order about 10% extra.
Frequently asked questions
How much gravel do I need for a patio base?
Multiply the patio area by the base depth (usually 4 inches). A 100 ft² patio at 4 inches needs about 1.2 cubic yards (≈1.6 tonnes) of crushed stone. The calculator gives your exact amount.
How deep should a patio gravel base be?
About 4 inches (10 cm) of compacted crushed stone for a standard paver patio, or 6 inches over soft or clay soil.
What gravel is best for a patio base?
Angular 3/4 inch crushed stone or crusher run, because it compacts into a firm, stable base. Top it with a thin sand or stone-dust setting layer before laying pavers.
Do I need sand over the gravel?
For pavers, yes — a 1 inch coarse sand or stone-dust setting bed over the compacted gravel base helps level and seat the pavers.
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Disclaimer: Results are estimates based on the values you enter and typical material densities. Actual quantities vary with gravel type, particle size, moisture and compaction. Cost estimates cover material only and exclude labour, delivery and taxes. Confirm quantities with your supplier.