Look up the nominal opening in micrometres associated with a listed mesh designation.
Select a mesh designation from the table used by this calculator.
Mesh count is not a universal conversion formula. This page returns its listed nominal opening values; actual aperture depends on the applicable sieve specification and wire diameter. Verify the required standard and supplier specification for laboratory, purchasing, or compliance work.
This calculator is a lookup table: choose a listed mesh designation and read the nominal opening paired with it on this page.
Mesh count alone does not determine one universal aperture. Wire diameter, weave and the sieve standard affect clear opening, so use the applicable product specification for laboratory, purchasing or compliance work.
| Term | Meaning |
|---|---|
| Mesh designation | The selected screen or sieve label, such as 100 mesh. |
| Nominal opening | The micrometre value paired with that label in this calculator. |
| µm | Micrometre, equal to one millionth of a metre. |
| Wire diameter | Not an input here; it affects the physical opening between wires. |
Selecting 100 mesh returns the table value 149 µm. No arithmetic is applied to the mesh number itself.
This example describes the value shown by this calculator. Check the relevant sieve specification because another standard or manufacturer may use a different nominal aperture.
The result is the nominal opening associated with the selected row of this calculator’s table, not a guaranteed measurement of every screen carrying that mesh label.
Mesh number describes a count of openings per linear inch in common usage, but clear aperture also depends on the wire. Standards define sieve sizes and tolerances; for a specified test, use the standard and certified sieve required by the method.
Use micrometres (µm) as a length unit: 1 µm = 0.001 mm. Keep the chosen designation and its standard alongside the result when comparing products or lab reports.
It returns the nominal micrometre opening paired with the selected mesh designation in this page’s lookup table.
No. Mesh count alone does not specify the clear aperture; wire diameter, weave and the governing sieve standard matter. This calculator uses a fixed table rather than deriving an opening from mesh count.
A micrometre is one millionth of a metre. There are 1,000 micrometres in a millimetre.
Sources may refer to different sieve standards, mesh series, wire diameters, tolerances or rounding. Compare the named standard and product specification, not only the mesh number.
No. It is a nominal lookup, not a measurement or certification. Use the specified test method and the supplier’s sieve documentation when compliance matters.
Another Mesh opening lookup source may use a different definition, standard, factor or rounding rule. Compare its method and inputs before comparing final numbers.
Use it as an arithmetic aid for looking up one commonly used U.S. sieve designation. Check the relevant original records and obtain qualified advice when the decision has medical, financial, safety or contractual consequences.
The page’s listed lookup values are not a claim that every row represents an ASTM-compliant aperture or tolerance.