01 — ChartMicron to mesh chart
| Microns (µm) | US sieve / mesh | Tyler mesh | mm | inches |
|---|---|---|---|---|
| 20 µm | No. 635 | 635 | 0.02 | 0.0008 |
| 25 µm | No. 500 | 500 | 0.025 | 0.001 |
| 32 µm | No. 450 | 450 | 0.032 | 0.0013 |
| 38 µm | No. 400 | 400 | 0.038 | 0.0015 |
| 45 µm | No. 325 | 325 | 0.045 | 0.0018 |
| 53 µm | No. 270 | 270 | 0.053 | 0.0021 |
| 63 µm | No. 230 | 250 | 0.063 | 0.0025 |
| 75 µm | No. 200 | 200 | 0.075 | 0.003 |
| 90 µm | No. 170 | 170 | 0.09 | 0.0035 |
| 106 µm | No. 140 | 150 | 0.106 | 0.0042 |
| 125 µm | No. 120 | 115 | 0.125 | 0.0049 |
| 150 µm | No. 100 | 100 | 0.15 | 0.0059 |
| 180 µm | No. 80 | 80 | 0.18 | 0.0071 |
| 212 µm | No. 70 | 65 | 0.212 | 0.0083 |
| 250 µm | No. 60 | 60 | 0.25 | 0.0098 |
| 300 µm | No. 50 | 48 | 0.3 | 0.0118 |
| 355 µm | No. 45 | 42 | 0.355 | 0.014 |
| 425 µm | No. 40 | 35 | 0.425 | 0.0167 |
| 500 µm | No. 35 | 32 | 0.5 | 0.0197 |
| 600 µm | No. 30 | 28 | 0.6 | 0.0236 |
| 710 µm | No. 25 | 24 | 0.71 | 0.028 |
| 850 µm | No. 20 | 20 | 0.85 | 0.0335 |
| 1,000 µm | No. 18 | 16 | 1 | 0.0394 |
| 1,180 µm | No. 16 | 14 | 1.18 | 0.0465 |
| 1,400 µm | No. 14 | 12 | 1.4 | 0.0551 |
| 1,700 µm | No. 12 | 10 | 1.7 | 0.0669 |
| 2,000 µm | No. 10 | 9 | 2 | 0.0787 |
| 2,360 µm | No. 8 | 8 | 2.36 | 0.0929 |
| 2,800 µm | No. 7 | 7 | 2.8 | 0.1102 |
| 3,350 µm | No. 6 | 6 | 3.35 | 0.1319 |
| 4,000 µm | No. 5 | 5 | 4 | 0.1575 |
| 4,750 µm | No. 4 | 4 | 4.75 | 0.187 |
| 5,600 µm | No. 3½ | 3.5 | 5.6 | 0.2205 |
02 — How it worksWhy micron to mesh is not a simple formula
A mesh number only tells you how many wires there are per inch. The opening depends on how thick those wires are. Dividing 25,400 by your micron size gives the number of openings per inch if the wire had zero thickness — real screens always need a lower mesh count to reach the same opening. That is why this tool matches your size to the nearest standard sieve instead.
If you are specifying custom wire cloth, use the wire mesh calculator to test combinations of mesh count and wire diameter.
03 — FAQFrequently asked questions
How do you convert microns to mesh?
For a rough estimate, divide 25,400 by the micron size (this ignores wire thickness, so it overstates the mesh). For a real screen, find the standard sieve whose opening is closest to your size — e.g. 150 µm is a No. 100 (100 mesh) sieve.
What mesh is 50 microns?
50 microns is between the No. 270 (53 µm) and No. 325 (45 µm) sieves. The closest standard size is 270 mesh.
What mesh is 100 microns?
100 microns is closest to the No. 140 sieve (106 µm), which is 150 mesh on the Tyler scale. The next finer sieve is No. 170 (90 µm).
What mesh is 25 microns?
25 microns is a No. 500 sieve (500 mesh) in ASTM E11.