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Free mesh to micron converter to convert U.S. mesh sizes to microns (micrometers) and vice versa. Convert between mesh and microns for particle size analysis, granulometry, and sieve analysis. Based on ASTM E11 standard. Perfect for industrial, scientific, and quality control applications.
Last updated: January 23, 2026
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Number of openings per linear inch
Enter microns to convert to mesh size
Mesh Size
100.0 mesh
openings per inch
Microns
149 μm
micrometers
Millimeters
0.149 mm
Inches
0.005866 in
Key Facts:
Standard
ASTM E11 Sieve Sizes
Uses the official ASTM E11 standard conversion table for accurate results
Conversion
Mesh ↔ Microns
Convert from mesh to microns or from microns to mesh automatically
Applications
Granulometry, Sieve Analysis
Perfect for particle size distribution analysis and material classification
Industries
Mining, Pharmaceuticals, Food
Essential for quality control in mining, pharmaceuticals, food processing, and construction
Speed
Instant calculations
See results immediately as you select mesh size or enter micron value
Range
3 to 400 mesh
Supports all standard U.S. mesh sizes from 3 mesh (6,730 μm) to 400 mesh (37 μm)
For 100 mesh:
Microns
149 μm
Millimeters
0.149 mm
Our mesh to micron converter uses the ASTM E11 standard conversion table, which provides industry-standard values for U.S. mesh sizes. When you select a mesh size, the calculator looks up the corresponding micron value from the standard table. When you enter a micron value, it finds the closest matching mesh size or calculates it using the approximate formula.
Standard Table (ASTM E11):Uses official conversion table for accurate resultsExample: 100 mesh = 149 μm (from table)Approximate Formula (50-400 mesh):micron = 14,900 ÷ meshExample: 100 mesh = 14,900 ÷ 100 = 149 μmInverse Conversion:mesh = 14,900 ÷ micronExample: 149 μm = 14,900 ÷ 149 = 100 meshThe calculator prioritizes the ASTM E11 standard table for accuracy, using the approximate formula for values not in the table.
Mesh size is a measurement unit used in granulometry (particle size analysis) to determine the distribution of particle sizes in granular materials. The mesh number represents the number of openings per linear inch in a sieve or screen.
Mesh size is the number of openings per linear inch in a sieve. For example, a 100-mesh screen has 100 openings per inch. The name comes from the mesh (sieve) tool used to perform particle size analysis.
Mesh = openings per linear inch
Mesh and microns have an inverse relationship: higher mesh numbers correspond to smaller particle sizes. This is because more openings per inch means smaller openings, which can only capture smaller particles.
Higher mesh = smaller microns
Converting mesh to micron can be done using a standard conversion table or an approximate formula. The most accurate method is to use the ASTM E11 standard conversion table, which provides exact values for standard mesh sizes.
To convert 100 mesh to microns:
Method 1 (Table): 100 mesh = 149 μm (from ASTM E11 table)Method 2 (Formula): 14,900 ÷ 100 = 149 μmBoth methods give the same result: 149 microns. The table method is preferred for standard sizes.
Converting microns to mesh uses the inverse of the mesh-to-micron formula. For standard sizes, you can use the conversion table in reverse, or use the formula: mesh = 14,900 ÷ micron.
To convert 149 microns to mesh:
Method 1 (Table): 149 μm ≈ 100 mesh (from ASTM E11 table)Method 2 (Formula): 14,900 ÷ 149 = 100.0 meshBoth methods confirm that 149 microns equals 100 mesh.
The relationship between mesh and microns is based on the physical structure of sieves. A mesh is created by weaving wires together, creating openings. The mesh number tells you how many of these openings fit in one linear inch.
The width of the wire used to make the mesh affects the opening size. Thicker wires mean smaller openings for the same mesh number.
Affects opening size
The opening size determines what particles can pass through. Smaller openings (higher mesh) capture smaller particles.
Determines particle size
The mesh number is the total of wire width plus opening width per inch. This is why the conversion isn't perfectly linear.
Wire + opening = mesh
This converter is essential for various real-world applications:
Classify and separate minerals by particle size. Essential for ore processing, material classification, and quality control in mining operations.
Control particle size for drug formulations, ensuring consistent dosage and bioavailability. Critical for tablet manufacturing and powder processing.
Separate and classify food particles for quality control, texture control, and processing efficiency. Used in flour milling, spice grinding, and ingredient preparation.
Analyze aggregate sizes for concrete, asphalt, and construction materials. Essential for meeting specifications and ensuring material quality.
Need other conversion tools? Check out our length converter and decimeter to meter converter.
Get Custom Calculator for Your PlatformResult: 100 mesh = 149 μm = 0.149 mm
100 mesh equals 149 microns, meaning particles smaller than 149 microns will pass through a 100-mesh screen, while larger particles will be retained.
Result: 200 mesh = 74 μm = 0.074 mm
200 mesh equals 74 microns, which is finer than 100 mesh. This screen will capture smaller particles, making it useful for fine particle separation.
Result: 149 μm = 100 mesh
149 microns equals 100 mesh. Particles of this size will be retained by a 100-mesh screen, while smaller particles will pass through.
50 mesh =
297 μm
325 mesh =
44 μm
400 mesh =
37 μm
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