Convert Mesh to Micron (μm) | Accurate Mesh to Micron

Convert mesh to micron helps you quickly and easily translate screen specifications into clear particle-size numbers for QA, R&D, purchasing, and production. Mesh (openings per inch) and microns (μm) live in different worlds: one is a count, the other is a length. Enter a value in either field of the calculator and it will display the result automatically.

How many microns equal a mesh?

There isn’t a single answer for “How many microns in X mesh?” because aperture size depends on wire diameter as well as mesh count. Use:

Aperture (μm) = (25.4/mesh)−wirediameter(mm)(25.4 / mesh) − wire_diameter(mm)(25.4/mesh)−wired​iameter(mm) × 1000

• 25.4 is mm per inch (to convert the inch-based mesh to millimeters).
   
• Subtract the wire diameter (in mm) from the pitch (25.4/mesh).
   
• Multiply by 1000 to get microns.

When exact wire diameter isn’t available, a common rule-of-thumb is:

Aperture (μm) ≈ 14,900 / mesh (approximation; varies by standard and wire)

Example (approx.):

• 200 mesh → 14,900 / 200 = 74.5 μm
   
• 325 mesh → 14,900 / 325 ≈ 45.8 μm
   

Tip: For compliance work (ASTM/ISO/GMP), use the precise method or select the standard-aware option in the converter to apply the correct wire diameter automatically.

Mesh basics

Mesh is the number of openings per linear inch in a woven wire screen. A 100-mesh screen has 100 openings per inch; a higher mesh number indicates smaller openings.

Quick facts (mesh):

• Mesh is a count, not a size.
   
• Standards: ASTM E11, ISO 3310, and the Tyler series (wire diameters differ).
   
• Applications: sieve analysis, powder classification, filtration, screen printing, abrasives, food and pharma processing.

Micron (micrometer) basics

A micron (micrometer, μm; sometimes typed “um”) is 1×10⁻⁶ meters. It’s the standard unit for particle size, filter ratings, and aperture measurements.

Quick facts (micron):

• 1 μm = 0.001 mm; 1,000 μm = 1 mm.
• “um to microns” means the same thing: um = μm = microns.

Common in particle size distribution metrics (D10/D50/D90), nominal/absolute filter ratings, and lab reporting.

Quick Reference Table (Approximate)

Using the 14,900/mesh rule-of-thumb (for fast field estimates):

Note: Actual values depend on the wire diameter defined by your chosen standard (ASTM E11 / ISO 3310 / Tyler). For exact compliance, select the standard in the calculator or enter wire diameter manually.
 

How to convert mesh to micron

Formula (precise):

μm = (25.4/mesh)−wirediameter(mm)(25.4 / mesh) − wire_diameter(mm)(25.4/mesh)−wired​iameter(mm) × 1000

Formula (approx.):

μm ≈ 14,900 / mesh

Worked example (approx.):

Convert 325 mesh to micron

μm ≈ 14,900 / 325 ≈ 45.8 μm

In meters, that’s 4.58×10⁻⁵ m (scientific notation for lab docs).

If you need to micron outputs for a report, select your preferred decimals (e.g., 1–2 dp for plant dashboards, 2–3 dp for QA/QC).

How to convert micron to mesh

When you have a target particle size in microns and need a screen:

Approximate reverse:

mesh ≈ 14,900 / μm

Examples (approx.):

• 75 μm to mesh ≈ 14,900 / 75 ≈ 199 (≈200 mesh)
• 120 μm to mesh ≈ 14,900 / 120 ≈ 124 mesh
• 37 μm to mesh ≈ 14,900 / 37 ≈ 403 mesh

Caution: At very fine sizes, wire diameter dominates. Always confirm with ASTM/ISO tables or use the standard-aware mode in the converter.
 

Applications Where Mesh to Micron (μm) Used

• Powders and granules: pigments, metal powders, ceramics, flour, excipients, APIs.
   
• Filtration & screens: air/water filters, polymer melt screens, oil & gas sand control.
   
• Abrasives: blasting media/grit comparisons across vendors.
   

Process engineering & QA/QC: aligning vendor sieve specs with in-house to micron targets (e.g., D50 ≤ 75 μm), reconciling sieve analysis with particle-size analyzers (laser diffraction), and standardizing specs across ERP/LIMS.
 

At Digital Calculator we keeps things clear and professional consistent units, sensible defaults, and copy-ready outputs to reduce misinterpretation across teams.