Particle Size Conversion Table

“+” before the mesh size indicates the particles are retained on and are larger than the sieve.

“-” before the mesh size indicates the particles pass through and are smaller than the sieve.

For example, if the particle size of a material is described as -10 +400 mesh, then 90% or more of the material will pass through a 10-mesh sieve and be retained by a 400-mesh sieve.

If a material is described as -10 mesh, then 90% or more of the material will pass through a 10-mesh sieve.

Mesh Size	Inches	Millimeters(mm)	Microns(μm)
4	0.187	4.76	4760
5	0.157	4	4000
6	0.132	3.36	3360
7	0.111	2.83	2830
8	0.0937	2.38	2380
10	0.0787	2	2000
12	0.0661	1.68	1680
14	0.0555	1.41	1410
16	0.0469	1.19	1190
18	0.0394	1	1000
20	0.0331	0.841	841
25	0.0278	0.707	707
30	0.0234	0.595	595
35	0.0197	0.5	500
40	0.0165	0.42	420
45	0.0139	0.354	354
50	0.0117	0.297	297
60	0.0098	0.25	250
70	0.0083	0.21	210
80	0.007	0.177	177
100	0.0059	0.149	149
120	0.0049	0.125	125
140	0.0041	0.105	105
170	0.0035	0.088	88
200	0.0029	0.074	74
230	0.0025	0.063	63
270	0.0021	0.053	53
325	0.0017	0.044	44
400	0.0015	0.037	37
625	0.0008	0.02	20
1250	0.0004	0.01	10
2500	0.0002	0.005	5