Mesh to Micron Converter — US Standard Sieve Sizes
Convert any US Standard mesh number to its ASTM E11 sieve opening in microns, millimetres and inches — or enter a particle size in microns to find the nearest standard mesh designation.
Convert
ASTM E11 standard sieve opening
How does this calculator work?
Mesh number = wires per inch; higher = finer. A 200-mesh screen has a 75 µm (0.075 mm) opening; a 100-mesh screen has 150 µm. Use the ASTM E11 table for exact values, or log-linear interpolation for non-standard sizes. Enter microns to find the nearest standard mesh designation.
Formula
How this is calculated
A mesh number tells you how many wires cross each linear inch in a woven-wire sieve screen. More wires per inch means finer openings and a smaller particle that can pass through. The exact opening size for each standard mesh number is defined by ASTM E11 (equivalent to ISO 3310-1) — for example, a 200-mesh screen has 200 wires per inch and a 75 µm (0.075 mm) opening, while an 8-mesh screen has a 2360 µm (2.36 mm) opening.
This converter uses the official ASTM E11 table for 29 standard sieve sizes from mesh 4 (4750 µm) to mesh 400 (38 µm). For mesh numbers between two standard entries, the calculator applies log-linear interpolation, which follows the underlying geometric series closely. When converting microns to a mesh number, the tool finds the nearest standard ASTM sieve opening and returns its mesh designation.
Note that Tyler mesh sizes (another widely used system) differ slightly from US Standard at some coarser sizes. The values here follow US Standard / ASTM E11. Real sieve separations also depend on particle shape, bulk flow, and sieve condition — the opening size is the nominal aperture, not a guaranteed cut.
Frequently asked questions
Mesh number is the count of wires per linear inch in a woven-wire sieve. Higher mesh numbers mean finer screens and smaller openings — a 200-mesh screen has 75 µm openings versus 2000 µm for a 10-mesh screen.
Both count openings per linear inch but use slightly different geometric series for some coarser sizes. For most common sizes (100, 200, 325, 400 mesh) the two systems agree. This converter uses US Standard / ASTM E11.
Look up or calculate the micron value, then divide by 1000. A 100-mesh screen has a 150 µm opening, which equals 0.150 mm.
Also known as
TG we-Calculate Editorial Team. (2026). Mesh to Micron Converter — US Standard Sieve Sizes [Online calculator]. TG we-Calculate. https://we-calculate.com/calculator/mesh-to-micron-converter
TG we-Calculate Editorial Team. "Mesh to Micron Converter — US Standard Sieve Sizes." TG we-Calculate. 2026. https://we-calculate.com/calculator/mesh-to-micron-converter.
TG we-Calculate Editorial Team, "Mesh to Micron Converter — US Standard Sieve Sizes," TG we-Calculate, 2026. [Online]. Available: https://we-calculate.com/calculator/mesh-to-micron-converter
@misc{wecalculate_mesh_to_micron_converter, title = {Mesh to Micron Converter — US Standard Sieve Sizes}, author = {{TG we-Calculate Editorial Team}}, howpublished = {\url{https://we-calculate.com/calculator/mesh-to-micron-converter}}, year = {2026}, note = {TG we-Calculate} }
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