Mesh ↔ Micron Conversion Tool
Convert sieve mesh size to particle size in microns (and back). This tool uses common U.S. sieve reference values plus interpolation for in-between sizes.
Note: Mesh-to-micron conversion is an engineering estimate. Actual particle passage depends on wire diameter, particle shape, agglomeration, and test method.
What is mesh size vs micron size?
When people compare powders, filters, or screens, they often use two different units: mesh and microns. They describe related ideas but are not exactly the same thing.
Mesh size
Mesh size means how many openings appear in one linear inch of a screen. For example, a 200-mesh screen has roughly 200 openings per inch. Higher mesh numbers usually mean smaller openings.
Micron size
A micron (µm) is a direct length unit: one millionth of a meter. It is often easier for lab and manufacturing teams because it directly expresses particle or opening diameter.
Quick conversion rule
A widely used rule-of-thumb is:
microns ≈ 14900 ÷ mesh
This shortcut is useful for fast estimates, but it is not perfectly exact across all sieve standards. That is why this calculator combines a reference table with logarithmic interpolation.
Common mesh to micron chart
| Mesh | Microns (µm) | Millimeters (mm) |
|---|---|---|
| 20 | 841 | 0.841 |
| 40 | 420 | 0.420 |
| 60 | 250 | 0.250 |
| 80 | 177 | 0.177 |
| 100 | 149 | 0.149 |
| 140 | 105 | 0.105 |
| 170 | 88 | 0.088 |
| 200 | 74 | 0.074 |
| 230 | 63 | 0.063 |
| 325 | 44 | 0.044 |
| 400 | 37 | 0.037 |
How to use this calculator
- Select Mesh to Micron if you have a screen number and want opening size in µm.
- Select Micron to Mesh if your spec sheet is in microns and you need a close mesh equivalent.
- Enter a positive value and click Calculate.
- Review the estimated result and the nearest standard sieve reference.
Why exact conversion can vary
In production environments, two materials with the same nominal size can behave differently through a sieve. The conversion can shift because of:
- Wire thickness: Two screens with the same mesh count can have slightly different opening widths.
- Particle shape: Needles, flakes, and spheres pass differently.
- Moisture and clumping: Agglomerated powders can act much larger than individual particles.
- Testing method: Dry sieving, wet sieving, and mechanical agitation settings change outcomes.
Typical applications
Powder processing
Manufacturers use mesh and micron conversion for product consistency, blending performance, and packaging quality checks.
Filtration
Filter buyers often compare cartridge micron ratings to screen mesh options when designing pre-filters and staged filtration systems.
Food and beverage
Coffee grounds, flour grading, sugar classification, and spice milling are common examples where understanding particle size improves process control.
Bottom line
If you need a quick practical answer, this calculator gives a strong estimate with standard sieve context. For regulated or critical specs, always confirm with the exact standard (such as ASTM/ISO references) and your own test method.