Mesh to Micron Converter
Convert mesh numbers to micron (μm), millimetre, and inch opening sizes using the ASTM E11 standard sieve series.
Reviewed October 7, 2026 Runs in your browser — inputs are never stored
Opening size
150.00 μm
Millimetres
0.15000 mm
Inches
0.00591 in
Quick reference (ASTM E11)
| Mesh | μm | mm |
|---|---|---|
| 3.5 | 5600 | 5.600 |
| 4 | 4750 | 4.750 |
| 5 | 4000 | 4.000 |
| 6 | 3350 | 3.350 |
| 7 | 2800 | 2.800 |
| 8 | 2360 | 2.360 |
| 10 | 2000 | 2.000 |
| 12 | 1700 | 1.700 |
| 14 | 1400 | 1.400 |
| 16 | 1180 | 1.180 |
| 18 | 1000 | 1.000 |
| 20 | 850 | 0.850 |
This tool provides general unit conversions for everyday and educational use. For regulated, legal, or scientific applications, verify conversion factors against the applicable official standard.
About the Mesh to Micron Converter
The mesh to micron converter gives the opening size, in microns, of a standard test sieve for a given mesh number according to ASTM E11. Mesh number counts the openings per linear inch, so a higher number means smaller openings. Because the wire thickness varies between sieve sizes, the relationship is not a simple formula, so the tool uses the standard sieve table.
How to use it
- 1Enter the mesh number of the sieve.
- 2Read the nominal opening in microns and millimetres.
- 3Use the reference table to compare neighbouring sieve sizes.
Worked example
a No. 100 sieve has openings of about 150 µm (0.15 mm), while a No. 200 sieve has openings of about 75 µm.
How it works
What is mesh?
Mesh number refers to the number of openings per linear inch in a wire-woven sieve. Higher mesh numbers = finer openings = smaller particles pass through.
Standard used
ASTM E11 — Standard Specification for Woven Wire Test Sieve Cloth and Test Sieves.
Applications
- Particle size analysis in pharmaceuticals
- Aggregate grading in civil engineering
- Powder metallurgy
- Food processing and milling
Common use cases
- Particle size analysis in labs
- Choosing sieves for powders and aggregates
- Reading grading specifications
Frequently asked questions
A:No — it is roughly inversely proportional but wire diameter deviations make it non-linear. Always use the ASTM table for precision work.
A:Below mesh 635 (20 μm), sieves are not typically used; membrane filtration is used instead.
Reviewed for accuracy · Last updated October 7, 2026
Conversion factors are based on internationally defined SI units and standard metric/imperial equivalence tables.
CalcWisee Editorial Team
Calculator development and formula review
CalcWisee is an independent site founded by Ayman. Every calculator is built from a published formula or official definition, tested against hand-worked examples before it goes live, and corrected promptly when a reader reports an issue to ayman@calcwisee.com.
Expertise: Financial mathematics, Health and fitness formulas, Applied mathematics, Unit conversion standards
References & sources
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