Gravel is sold by weight (tons), but you plan your driveway by volume (cubic yards). The conversion between the two depends entirely on which rock you pick — and the difference is bigger than most people expect before they get a delivery invoice.
Enter your driveway dimensions and rock type, and our calculator converts it to the exact tons and cost automatically.
Calculate My Gravel Now 🚀Using a standard single-car gravel driveway (roughly 12 ft x 50 ft) as the example, here's how rock type alone changes your tonnage and cost — using the same $45/ton price point across all three so the comparison isolates the actual driver: weight density.
| Rock Type | Density | Tons Needed (incl. 10% waste) | Cost at $45/ton |
|---|---|---|---|
| Pea Gravel | 1.30 tons/cu yd | 15.9 tons | $715 |
| Crushed Stone | 1.35 tons/cu yd | 16.5 tons | $742 |
| River Rock | 1.50 tons/cu yd | 18.3 tons | $825 |
*Real-world pricing per ton also varies by rock type — decorative river rock commonly costs more per ton than basic crushed stone at most supply yards, on top of the higher tonnage shown here. Get a local quote for an accurate total.
The catch: crushed stone — not pea gravel or river rock — is the only one of these three actually recommended as a driveway base. Its jagged edges interlock when compacted into a stable surface; pea gravel and river rock are round and will shift and roll under tire weight, leading to ruts and a driveway that never feels solid.
If you calculate 11.1 cubic yards of gravel for your driveway and order exactly that, you will come up short. Gravel is full of air gaps between particles. As soon as a vehicle drives over it (or you run a plate compactor over it during installation), those air gaps collapse and the gravel level drops.
Compaction doesn't add material — it removes the air between particles, which is exactly why ordering the "exact" volume always comes up short.
Print this before the delivery truck shows up — a gravel driveway is only as good as the prep underneath it.
River rock is denser (1.50 tons/cu yd vs. 1.35 for crushed stone), so the same volume weighs more, which alone increases your ton count by about 11%. It's also typically priced higher per ton at most suppliers since it's sold as a decorative product, compounding the cost difference.
Yes — many driveways use crushed stone as the structural base layer (6-8 inches) and a thin decorative top layer of a different rock for appearance. Just don't substitute the structural base layer itself with a round-stone type; it needs to be angular material that locks together.
Expect to add a fresh top-up layer every 2-3 years for a driveway with regular vehicle traffic, since gravel migrates, settles further, and gets tracked off the surface over time. A light annual raking and refill of low spots extends the time between full top-ups.