Side by side
| No. 57 stone | No. 8 stone | |
|---|---|---|
| Nominal size | 1 in to No. 4 | 3/8 in to No. 8 |
| Measured weight range | 1.29 to 1.47 t/yd³ | 1.16 to 1.52 t/yd³ |
| Weight per cubic yard | 2,576 lb (1.29 t) | 2,314 lb (1.16 t) |
| Cubic yards per ton | 0.78 | 0.86 |
| Sq ft per ton at 3 in | 84 | 93 |
| Average price | – | – |
Weights and prices from the sources listed below.
Both are AASHTO M43 / ASTM D448 sizes. The lower number is the larger stone. FHWA's tests found the unit weights in the table above; see the full gradations for No. 57 and No. 8.
Working it out
Cubic yards = area × depth ÷ 324 (sq ft and inches). Tons = cubic yards × weight per cubic yard.
For 200 sq ft at 3 inches, both need 1.85 cubic yards: 2.39 tons of no. 57 stone or 2.14 tons of no. 8 stone.
Common questions
Which is heavier, no. 57 stone or no. 8 stone?
No. 57 stone at about 1.29 tons per cubic yard, against 1.16.
Sources
- https://www.fhwa.dot.gov/publications/research/infrastructure/structures/bridge/15034/003.cfm
- https://spinternet.dot.state.oh.us/Divisions/ConstructionMgt/OnlineDocs/Specifications/2005CMS/700/703.htm