PARTICLE SIZE CONVERSION

SIEVE OPENING SIEVE DESIGNATION
Inches mm Microns Standard (mm) Mesh
1.00 25.4 25400 25.4 1 in.
0.875 22.6 22600 22.6 7/8 in.
0.750 19.0 19000 19.0 3/4 in.
0.625 16.0 16000 16.0 5/8 in.
0.530 13.5 13500 13.5 0.530 in.
0.500 12.7 12700 12.7 1/2 in.
0.438 11.2 11200 11.2 7/16 in.
0.375 9.51 9510 9.51 3/8 in.
0.312 8.00 8000 8.00 5/16 in.
0.265 6.73 6730 6.73 0.265 in.
0.250 6.35 6350 6.35 1/4 in.
0.223 5.66 5660 5.66 No.3 1/2
0.187 4.76 4760 4.76 No. 4
0.157 4.00 4000 4.00 No. 5
0.132 3.36 3360 3.36 No. 6
0.111 2.83 2830 2.83 No. 7
0.0937 2.38 2380 2.38 No. 8
0.0787 2.00 2000 2.00 No. 10
0.0661 1.68 1680 1.68 No. 12
0.0555 1.41 1410 1.41 No. 14
0.0469 1.19 1190 1.19 No. 16
0.0394 1.00 1000 1.00 No. 18
0.0331 0.841 841 0.841 No. 20
0.0278 0.707 707 0.707 No. 25
0.0234 0.595 595 0.595 No. 30
0.0197 0.500 500 0.500 No. 35
0.0165 0.420 420 0.420 No. 40
0.0139 0.354 354 0.354 No. 45
0.0117 0.297 297 0.297 No. 50
0.0098 0.250 250 0.250 No. 60
0.0083 0.210 210 0.210 No. 70
0.0070 0.177 177 0.177 No. 80
0.0059 0.149 149 0.149 No. 100
0.0049 0.125 125 0.125 No. 120
0.0041 0.105 105 0.105 No. 140
0.0035 0.088 88 0.088 No. 170
0.0029 0.074 74 0.074 No. 200
0.0025 0.063 63 0.063 No. 230
0.0021 0.053 53 0.053 No. 270
0.0017 0.044 44 0.044 No. 325
0.0015 0.037 37 0.037 No. 400
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