Sieve Sizes vs. Mesh Designations

US commercial sieve sizes vs. mesh designations. Mesh is a measurement of particle size given in the number of holes per inch. This table shows the relationship between sieve sizes in millimeters, opening measurements in inches, and US Standard Mesh designations.

Sieve Size (mm)	Opening (in)	US Standard Mesh
11.2	0.438	7/16"
6.35	0.25	1/4"
5.6	0.223	3.5
4.75	0.187	4
4	0.157	5
3.35	0.132	6
2.8	0.11	7
2.36	0.0937	8
2	0.0787	10
1.7	0.0661	12
1.4	0.0555	14
1.18	0.0469	16
1	0.0394	18
0.841	0.0331	20
0.71	0.0278	25
0.595	0.0232	30
0.5	0.0197	35
0.4	0.0165	40
0.355	0.0139	45
0.3	0.0117	50
0.25	0.0098	60
0.21	0.0083	70
0.177	0.007	80
0.149	0.0059	100
0.125	0.0049	120
0.105	0.0041	140
0.088	0.0035	170
0.074	0.0029	200
0.063	0.0024	230
0.053	0.0021	270
0.044	0.0017	325
0.037	0.0015	400
0.025	0.001	500
0.02	0.0008	632