Stone size gradation chart

Which size gravel stone to choose



Size Stone Pea stone Screenings
US MM #1 #2 #4 #5 #57 #67 #7 #8 #89 #9 #10
4" 101.6 .
3 1/2" 88.9 X
3" 76.2 X .
2 1/2" 63.5 X X
2" 50.8 X X .
1 1/2" 38.1 .. X X . .
1" 25.4 . .. X X X .
3/4" 19.1 . .. X X X .
1/2" 12.7 .. .. X X X . .
3/8" 9.5 . . X X X X X . .
3/16" 4.8 . . . X X X X
3/32" 2.4 . X X X
1/16" - 0 0-1.6 . .. .. X
(X) = Stone consists largely of this size
(..) = Stone can consist of up to 15% of this size
(.) = Stone can consist of up to 10% of this size
* Each Stone gradation can contain up to 10% upper and lower grades and some fine material (sand).