Mesh to MM Size Conversion Chart
| Mesh sizes of standard wire sieves – British and US standards | ||
| Mesh Number |
Nominal aperture size (mm) | |
| BS410 | ASTM E-11-61 | |
| 3 | 5.60 | – |
| 3½ | 4.75 | 5.66 |
| 4 | 4.00 | 4.76 |
| 5 | 3.35 | 4.00 |
| 6 | 2.80 | 3.36 |
| 7 | 2.36 | 2.83 |
| 8 | 2.00 | 2.38 |
| 10 | 1.70 | 2.00 |
| 12 | 1.40 | 1.68 |
| 14 | 1.18 | 1.41 |
| 16 | 1.00 | 1.19 |
| 18 | 0.850 | 1.00 |
| 20 | – | 0.841 |
| 22 | 0.710 | – |
| 25 | 0.600 | 0.707 |
| 30 | 0.500 | 0.595 |
| 35 | 0.500 | – |
| 36 | 0.425 | – |
| 40 | – | 0.420 |
| 44 | 0.355 | – |
| 45 | – | 0.354 |
| 50 | – | 0.297 |
| 52 | 0.300 | – |
| 60 | 0.250 | 0.250 |
| 70 | – | 0.210 |
| 72 | 0.212 | – |
| 80 | – | 0.177 |
| 85 | 0.180 | – |
| 100 | 0.150 | 0.149 |
| 120 | 0.125 | 0.125 |
| 140 | – | 0.105 |
| 150 | 0.106 | – |
| 170 | 0.090 | 0.088 |
| 200 | 0.075 | 0.074 |
| 230 | – | 0.063 |
| 240 | 0.063 | – |
| 270 | – | 0.053 |
| 300 | 0.053 | – |
| 325 | – | 0.044 |
| 400 | – | 0.037 |
