Gravel vs. Crushed Stone — What's the Difference?
Pea gravel vs. crushed stone, river rock vs. limestone, rounded vs. angular — which one to use for which project, with field-tested practical guidance.
Most homeowners use the words "gravel" and "crushed stone" interchangeably. The supplier doesn't. The difference between them is the difference between a path that washes away in two years and a driveway that lasts twenty.
The actual definitions
Gravel (in the trade sense) is naturally weathered loose stone. It's formed by water tumbling rocks against each other in rivers and glaciers, and the edges round off over millennia. Pea gravel and river rock are true gravels.
Crushed stone is mechanically crushed bedrock. The fragments are angular with sharp faces. Limestone, granite, basalt, and trap rock are common parent rocks. The numbered grades you hear about (#57, #8, #4) are all crushed stone.
Casual usage lumps both into "gravel" — including the calculator on this site — but when you call a quarry, the distinction matters.
Side-by-side comparison
| Property | True gravel (pea, river rock) | Crushed stone (#57, CA6, etc.) |
|---|---|---|
| Shape | Rounded, smooth | Angular, sharp faces |
| Compaction | Minimal — won't lock | Excellent — locks under load |
| Walkability | Soft, comfortable, but rolls | Firmer, less forgiving on bare feet |
| Drainage | Good (large voids) | Good to excellent (open grades) |
| Erosion resistance | Low — rolls in water flow | High — angular pieces don't roll |
| Driveway suitability | Decorative top course only | Yes — both base and top |
| Look | Natural, organic, decorative | Clean, modern, structural |
| Cost per ton | $30–$70 typical | $15–$45 typical |
When to choose gravel (rounded)
- Decorative beds and ground cover. Pea gravel and river rock look organic and finished — great around plantings, fire pits, or as mulch substitute.
- Kid play areas. Smooth, rounded stones are safer underfoot than angular rock. Pea gravel is ASTM-rated for playground use.
- Walking paths (with a base). Pea gravel over a compacted base feels softer and more pleasant than crushed stone. Use edging to keep it contained.
- Dry creek beds. River rock looks like… river rock. Perfect for water features and erosion features that mimic streams.
- Around pools. Smooth surface, easy on bare feet, drains well.
When to choose crushed stone (angular)
- Driveway base. Always. Dense-grade crushed stone (CA6 / ABC) is the only correct material for a structural base.
- Driveway top course. #57 limestone is the standard. Walks well, drains well, won't roll under tires.
- Paver bases. Same logic as driveways. Compaction is doing the work.
- French drains. #57 stone — angular voids let water flow freely. Pea gravel will work but #57 is cheaper and more available.
- Behind retaining walls. Angular stone for free drainage; rounded stone packs and traps water against the wall.
- Concrete aggregate. Crushed stone bonds with cement paste better than rounded gravel. Most ready-mix concrete is made with crushed stone.
Does crushed stone cost more than gravel?
Slightly. Crushed stone runs $35–$60 per ton delivered in the U.S.; rounded gravel (pea gravel, river rock) typically runs $40–$80 per ton because rounded stones are either dredged from rivers or graded extensively. The price difference is often less than $0.20 per square foot at typical depths — small enough that the right material for the job almost always wins over the cheaper one. Use the gravel cost calculator with your local price to compare exact totals.
How to tell them apart at the yard
When you visit a stone yard, the piles aren't always labeled. Three quick checks:
- Pick up a handful. If the stones have flat faces and sharp edges, you're holding crushed stone. If they roll smoothly between your fingers, it's rounded gravel.
- Push your boot in. Crushed stone holds your weight without sinking; rounded gravel shifts and lets you sink an inch.
- Look at the pile shape. A pile of crushed stone holds a steeper angle of repose (~38°). Rounded gravel slumps to a shallower pile (~30°).
Most U.S. yards label dense-grade base materials as "crusher run," "ABC," "CA6," or "21AA." Top-course angular stone is usually labeled "#57" or "#67." Rounded products are labeled "pea gravel," "river rock," or "washed gravel."