Mesh Size Converter: Mesh, Micron, mm & Inch
Convert common U.S. sieve mesh sizes into nominal aperture values, or enter an opening size to find the nearest standard mesh.
Quick mesh & aperture lookup
Enter a mesh number or an opening size and choose its unit.
Examples: 25 mesh ≈ 0.710 mm; 70 mesh ≈ 0.212 mm. Non-standard values return the nearest listed U.S. sieve size.Mesh Size Conversion Table
Common U.S. sieve mesh openings for direct reference.
| U.S. Mesh | Nominal Aperture (μm) | Aperture (mm) | Aperture (inch) |
|---|---|---|---|
| 4 | 4,750 | 4.75 | 0.1870 |
| 5 | 4,000 | 4.00 | 0.1575 |
| 6 | 3,350 | 3.35 | 0.1319 |
| 7 | 2,800 | 2.80 | 0.1102 |
| 8 | 2,360 | 2.36 | 0.0929 |
| 10 | 2,000 | 2.00 | 0.0787 |
| 12 | 1,700 | 1.70 | 0.0669 |
| 14 | 1,400 | 1.40 | 0.0551 |
| 16 | 1,180 | 1.18 | 0.0465 |
| 18 | 1,000 | 1.00 | 0.0394 |
| 20 | 850 | 0.850 | 0.0335 |
| 25 | 710 | 0.710 | 0.0280 |
| 30 | 600 | 0.600 | 0.0236 |
| 35 | 500 | 0.500 | 0.0197 |
| 40 | 425 | 0.425 | 0.0167 |
| 45 | 355 | 0.355 | 0.0140 |
| 50 | 300 | 0.300 | 0.0118 |
| 60 | 250 | 0.250 | 0.0098 |
| 70 | 212 | 0.212 | 0.0083 |
| 80 | 180 | 0.180 | 0.0071 |
| 100 | 150 | 0.150 | 0.0059 |
| 120 | 125 | 0.125 | 0.0049 |
| 140 | 106 | 0.106 | 0.0042 |
| 170 | 90 | 0.090 | 0.0035 |
| 200 | 75 | 0.075 | 0.0030 |
| 230 | 63 | 0.063 | 0.0025 |
| 270 | 53 | 0.053 | 0.0021 |
| 325 | 45 | 0.045 | 0.0018 |
| 400 | 38 | 0.038 | 0.0015 |
How Mesh Size and Aperture Are Related
Mesh count indicates the number of openings per linear inch. Aperture is the clear distance between adjacent wires. A higher mesh number generally means a smaller opening, but wire thickness also changes the available opening and screening area.
Start with the cut size
Specify the required separation point in mm or μm whenever possible.
Check material behavior
Moisture, agglomeration, static charge and bulk density can change screening performance.
Confirm the screen design
Review wire diameter, open area, screen material and cleaning method.
Need Help Selecting a Screen Mesh?
Send us your material, feed size, target cut size and capacity. We can recommend a suitable aperture and configuration.