How much #57 crushed stone for a 10 × 20 ft area, 2″ deep?
| Order this many tons | 1.67tons |
|---|---|
| Volume33 ft³ | 1.23yd³ |
| Area10 × 20 ft | 200ft² |
| 50 lb bagsfar cheaper to have it delivered loose | 67bags |
| Coverage per ton | 120ft² at 2″ |
| Weight assumeddry and loose — wet stone runs up to 10% heavier | 2700lb/yd³ |
| Typical use | drainage, drives over fabric, French drains |
Notes
- Stone is sold by the ton, not by the yard. That conversion is where estimates go wrong, and it is different for every material: #57 crushed stone runs 2700 lb per cubic yard, so 1.23 yd³ is 1.67 tons. Quarries quote and bill in tons; the yardage figure is only useful for picturing the pile.
- No compaction allowance here — #57 crushed stone is not compacted in normal use. Adding a base-course allowance to decorative stone is the mirror-image mistake to leaving it off crusher run.
- 2″ is about right for decorative beds. For reference: 2″ for decorative beds, 3″ for walkways, 4″ for a pedestrian paver base or drainage, 6″ under vehicles, 8″ on soft soil.
- Get the depth right before the material. A driveway base at 3″ fails no matter how good the stone is, and a decorative bed at 6″ is money buried where nobody sees it.
- Delivery is priced by the load, not by the ton. Ordering 1.67 tons and then finding you need one more usually costs a second delivery fee larger than the extra stone — round up.
Stone is sold by the ton
That is the conversion every estimate trips over, and it is different for every material. 200 ft² at 2″ is 1.23 cubic yards — but the quarry will quote you 1.67 tons, because #57 crushed stone weighs 2700 lb per cubic yard.
The yardage figure is only useful for picturing the pile. The tonnage is what you pay for.
Compaction, or not
#57 crushed stone is a 0% compaction material. Base course stone loses roughly a fifth of its volume under a plate compactor, so the volume you order has to exceed the finished depth. Decorative stone is never compacted, so adding that allowance to it buys you a pile you cannot use.
Both mistakes are common, and they point in opposite directions.
Depth by use
2″ suits decorative beds. The usual figures: 2″ for decorative beds, 3″ for walkways, 4″ for a pedestrian paver base or drainage, 6″ under vehicles, 8″ on soft or filled ground.
Getting the depth right matters more than getting the material right. A driveway base at 3″ fails whatever stone is in it.
Coverage
One ton of #57 crushed stone covers about 120 ft² at 2″. Useful for checking a quote, and for working out whether the last bit is worth a second delivery — which it usually is not, because delivery is priced per load rather than per ton.
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Read more
- How Much Gravel Do I Need? Yards In, Tons OutEvery gravel calculation has one more step than people expect, and skipping it is why so many jobs end with a second delivery charge.
- Bags or a Truck — The Crossover Is About One Cubic YardThe arithmetic is not really about price. It is about how long a slab can sit half-poured before the joint between the halves becomes permanent.
- Rebar in a Slab — Spacing, Cover, and Why Position Matters MoreRebar laid on the ground and left there does nothing. It has to be held up into the concrete, and that is the step that gets skipped.
- Concrete Slab Cost by State — 400 ft², All 51The figures price a 4-inch slab on grade. A driveway wants six inches and rebar, and that is not a small adjustment.