Particle Size Conversion Table
A material’s particle size is typically designated in either microns or mesh. Here you will find a useful particle size conversion table that shows micron to mesh conversions for a fast comparison of particle size between these two units. The chart also allows you to compare sieve designations and sieve openings in inches, millimeters, or microns.
Sieve Designation | Nominal Sieve Opening | |||
---|---|---|---|---|
Standard | Mesh | inches | mm | Microns |
25.4 mm | 1 in. | 1.00 | 25.4 | 25400 |
22.6 mm | 7/8 in. | 0.875 | 22.6 | 22600 |
19.0 mm | 3/4 in. | 0.750 | 19.0 | 19000 |
16.0 mm | 5/8 in. | 0.625 | 16.0 | 16000 |
13.5 mm | 0.530 in. | 0.530 | 13.5 | 13500 |
12.7 mm | 1/2 in. | 0.500 | 12.7 | 12700 |
11.2 mm | 7/16 in. | 0.438 | 11.2 | 11200 |
9.51 mm | 3/8 in. | 0.375 | 9.51 | 9510 |
8.00 mm | 5/16 in. | 0.312 | 8.00 | 8000 |
6.73 mm | 0.265 in. | 0.265 | 6.73 | 6730 |
6.35 mm | 1/4 in. | 0.250 | 6.35 | 6350 |
5.66 mm | No. 3 1/2 | 0.223 | 5.66 | 5660 |
4.76 mm | No. 4 | 0.187 | 4.76 | 4760 |
4.00 mm | No. 5 | 0.157 | 4.00 | 4000 |
3.36 mm | No. 6 | 0.132 | 3.36 | 3360 |
2.83 mm | No. 7 | 0.111 | 2.83 | 2830 |
2.38 mm | No. 8 | 0.0937 | 2.38 | 2380 |
2.00 mm | No. 10 | 0.0787 | 2.00 | 2000 |
1.68 mm | No. 12 | 0.0661 | 1.68 | 1680 |
1.41 mm | No. 14 | 0.0555 | 1.41 | 1410 |
1.19 mm | No. 16 | 0.0469 | 1.19 | 1190 |
1.00 mm | No. 18 | 0.0394 | 1.00 | 1000 |
0.841 mm | No. 20 | 0.0331 | 0.841 | 841 |
0.707 mm | No. 25 | 0.0278 | 0.707 | 707 |
0.595 mm | No. 30 | 0.0234 | 0.595 | 595 |
0.500 mm | No. 35 | 0.0197 | 0.500 | 500 |
0.420 mm | No. 40 | 0.0165 | 0.420 | 420 |
0.354 mm | No. 45 | 0.0139 | 0.354 | 354 |
0.297 mm | No. 50 | 0.0117 | 0.297 | 297 |
0.250 mm | No. 60 | 0.0098 | 0.250 | 250 |
0.210 mm | No. 70 | 0.0083 | 0.210 | 210 |
0.177 mm | No. 80 | 0.0070 | 0.177 | 177 |
0.149 mm | No. 100 | 0.0059 | 0.149 | 149 |
0.125 mm | No. 120 | 0.0049 | 0.125 | 125 |
0.105 mm | No. 140 | 0.0041 | 0.105 | 105 |
0.088 mm | No. 170 | 0.0035 | 0.088 | 88 |
0.074 mm | No. 200 | 0.0029 | 0.074 | 74 |
0.063 mm | No. 230 | 0.0025 | 0.063 | 63 |
0.053 mm | No. 270 | 0.0021 | 0.053 | 53 |
0.044 mm | No. 325 | 0.0017 | 0.044 | 44 |
0.037 mm | No. 400 | 0.0015 | 0.037 | 37 |
Sieve and Mesh Conventions
Large sieve openings (1 in. to 1/4 in.) have been designated by a sieve "mesh" size that corresponds to the size of the opening in inches. Small sieve "mesh" sizes of 3 1/2 to 400 are designated by the number of openings per linear inch in the sieve.
The following convention is used to characterize particle size by mesh designation:
- "+" before the sieve mesh indicates the particles are retained by the sieve;
- "-" before the sieve mesh indicates the particles pass through the sieve;
- typically 90% or more of the particles will lie within the indicated range.
For example, if the particle size of a material is described as -4 +40 mesh, then 90% or more of the material will pass through a 4-mesh sieve (particles smaller than 4.76 mm) and be retained by a 40-mesh sieve (particles larger than 0.420 mm). If a material is described as -40 mesh, then 90% or more of the material will pass through a 40-mesh sieve (particles smaller than 0.420 mm).
Mesh Sieve Products
We offer a variety of mesh screens for cell dissociation and tissue grinding, testing, and particle separation.
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