Mesh to Micron Converter
Instantly convert mesh sizes to microns, millimeters, and inches
149 μm
Conversion Result
Mesh to Micron Conversion Chart
| US Mesh | Microns (μm) | Millimeters (mm) | Inches (in) |
|---|---|---|---|
| 3 | 6730 | 6.730 | 0.2650 |
| 4 | 4760 | 4.760 | 0.1870 |
| 5 | 4000 | 4.000 | 0.1570 |
| 6 | 3360 | 3.360 | 0.1320 |
| 7 | 2830 | 2.830 | 0.1110 |
| 8 | 2380 | 2.380 | 0.0937 |
| 10 | 2000 | 2.000 | 0.0787 |
| 12 | 1680 | 1.680 | 0.0661 |
| 14 | 1410 | 1.410 | 0.0555 |
| 16 | 1190 | 1.190 | 0.0469 |
| 18 | 1000 | 1.000 | 0.0394 |
| 20 | 841 | 0.841 | 0.0331 |
| 25 | 707 | 0.707 | 0.0280 |
| 30 | 595 | 0.595 | 0.0232 |
| 35 | 500 | 0.500 | 0.0197 |
| 40 | 400 | 0.400 | 0.0165 |
| 45 | 354 | 0.354 | 0.0138 |
| 50 | 297 | 0.297 | 0.0117 |
| 60 | 250 | 0.250 | 0.0098 |
| 70 | 210 | 0.210 | 0.0083 |
| 80 | 177 | 0.177 | 0.0070 |
| 100 | 149 | 0.149 | 0.0059 |
| 120 | 125 | 0.125 | 0.0049 |
| 140 | 105 | 0.105 | 0.0041 |
| 170 | 88 | 0.088 | 0.0035 |
| 200 | 74 | 0.074 | 0.0029 |
| 230 | 63 | 0.063 | 0.0024 |
| 270 | 53 | 0.053 | 0.0021 |
| 325 | 44 | 0.044 | 0.0017 |
| 400 | 37 | 0.037 | 0.0015 |
| 550 | 25 | 0.025 | 0.0009 |
| 625 | 20 | 0.020 | 0.0008 |
| 800 | 15 | 0.015 | 0.0006 |
| 1250 | 10 | 0.010 | 0.0004 |
Conversion Formula
Mesh to Micron Formula
Microns (μm) = 25,400 ÷ Mesh Size
This theoretical formula is based on the fact that 1 inch equals 25,400 microns. The mesh number represents the number of openings per linear inch.
Micron to Mesh Formula
Mesh Size = 25,400 ÷ Microns (μm)
Use this formula to convert micron measurements back to mesh size. Note that actual values may vary slightly due to wire diameter variations.
Conversion Examples
Example 1: Convert 200 Mesh to Microns
Calculation: 25,400 ÷ 200 = 127 μm (theoretical)
Standard value: 74 μm (actual opening size)
The difference is due to wire diameter, which reduces the actual opening size.
Example 2: Convert 100 Mesh to Microns
Calculation: 25,400 ÷ 100 = 254 μm (theoretical)
Standard value: 149 μm (actual opening size)
Higher mesh numbers have proportionally larger wire diameters relative to openings.
Example 3: Convert 500 Microns to Mesh
Calculation: 25,400 ÷ 500 = 50.8 mesh (theoretical)
Nearest standard: 35 mesh (500 μm actual opening)
Always refer to standardized mesh-micron charts for accurate filtration specifications.
Popular Mesh Conversions
35 Mesh
= 500 μm
60 Mesh
= 250 μm
100 Mesh
= 149 μm
200 Mesh
= 74 μm
325 Mesh
= 44 μm
400 Mesh
= 37 μm
Applications by Mesh Size
Coarse Filtration (3-20 Mesh)
Range: 6730-841 μm
Uses: Gravel separation, large particle screening, agricultural processing, industrial sifting of coarse materials
Uses: Gravel separation, large particle screening, agricultural processing, industrial sifting of coarse materials
Medium Filtration (25-80 Mesh)
Range: 707-177 μm
Uses: Sand filtration, powder classification, food processing, pharmaceutical granulation, chemical processing
Uses: Sand filtration, powder classification, food processing, pharmaceutical granulation, chemical processing
Fine Filtration (100-200 Mesh)
Range: 149-74 μm
Uses: Paint straining, water treatment, fine powder production, cosmetics manufacturing, printing inks
Uses: Paint straining, water treatment, fine powder production, cosmetics manufacturing, printing inks
Ultra-Fine Filtration (325+ Mesh)
Range: Below 44 μm
Uses: Pharmaceutical purification, fine chemicals, laboratory filtration, toner production, ceramic glazes
Uses: Pharmaceutical purification, fine chemicals, laboratory filtration, toner production, ceramic glazes
⚠️ Important Note: Mesh size alone does not determine particle retention. Wire thickness varies between manufacturers, affecting actual opening size. Always verify micron ratings for critical filtration applications.
Industry Applications
Water Treatment & Filtration
Mesh screens are extensively used in municipal water treatment facilities and industrial filtration systems. Common sizes include 50 mesh (297 μm) for pre-filtration and 200 mesh (74 μm) for fine particle removal. These screens protect downstream equipment and remove sediment, debris, and suspended solids from water sources.
Pharmaceutical Manufacturing
The pharmaceutical industry requires precise particle size control for drug formulation. Mesh sizes from 100 (149 μm) to 400 (37 μm) are commonly used for powder classification, ensuring consistent drug particle distribution, dissolution rates, and bioavailability. Fine mesh screens also protect sterile products from contamination.
Food Processing
Food-grade mesh screens separate ingredients by particle size, remove foreign objects, and ensure product consistency. Flour milling uses 70-140 mesh (210-105 μm), while sugar refining employs finer screens. Mesh filtration also protects processing equipment and maintains hygiene standards in production lines.
Oil & Gas Industry
Mesh filters protect pumps, valves, and downstream equipment from particulate damage. Screens ranging from 40 mesh (400 μm) to 200 mesh (74 μm) remove sand, scale, and debris from crude oil, natural gas, and process fluids. These filters extend equipment life and maintain operational efficiency in harsh environments.
Paint & Coatings
Automotive and industrial coatings require particle-free finishes. Mesh strainers from 100-325 (149-44 μm) remove agglomerates and contaminants, preventing spray nozzle clogs and surface defects. Finer meshes produce smoother finishes and higher gloss levels in premium coating applications.
Mining & Mineral Processing
Mesh screens classify minerals by size during ore processing. Coarse screens (3-20 mesh, 6730-841 μm) separate large rocks, while finer meshes (50-200, 297-74 μm) grade mineral powders. This classification optimizes extraction efficiency and product quality in metal refining and aggregate production.
Related Conversions
Mesh to Millimeters
Convert mesh size to millimeters by dividing microns by 1,000. Example: 100 mesh = 149 μm = 0.149 mm. This conversion is useful for metric-based specifications.
Mesh to Inches
Convert mesh to inches using: Inches = 1 ÷ Mesh Size. Example: 100 mesh = 0.0059 inches opening. This represents the spacing between wires in the screen.
Microns to Millimeters
Simple metric conversion: 1 mm = 1,000 μm. Divide micron value by 1,000. Example: 500 μm = 0.5 mm. Essential for engineering drawings and specifications.
Microns to Nanometers
For ultra-fine applications: 1 μm = 1,000 nm. Multiply micron value by 1,000. Example: 1 μm = 1,000 nm. Used in nanotechnology and membrane filtration specifications.
Frequently Asked Questions
What does mesh size mean?
Mesh size refers to the number of openings per linear inch in a woven wire screen. For example, a 100 mesh screen has 100 openings per inch. The higher the mesh number, the smaller the opening size. This inverse relationship means 200 mesh has smaller openings than 100 mesh.
Why do calculated and actual micron values differ?
The theoretical formula (25,400 ÷ mesh) calculates opening size without accounting for wire diameter. Actual mesh screens have wire thickness that reduces the opening size. For example, 100 mesh theoretically equals 254 μm, but the actual opening is 149 μm due to wire diameter. Always use standardized charts for accurate specifications.
How do I choose the right mesh size for filtration?
Select a mesh size with openings slightly smaller than the particles you want to remove. For high contamination levels, use a coarser mesh to prevent rapid clogging. For critical applications, consult particle size analysis data and consider using multiple filtration stages with progressively finer meshes.
Can mesh screens be used for liquid and gas filtration?
Yes, mesh screens are versatile and used in both liquid and gas filtration. Material selection is crucial: stainless steel resists corrosion in water and chemicals, while brass and bronze work well in petroleum applications. Gas filtration typically uses finer meshes (200-400) to capture airborne particles.
What is the finest mesh size available?
Commercial woven wire mesh screens are available up to approximately 635 mesh (20 μm), though 400 mesh (37 μm) is more commonly used. For finer filtration below 10 μm, membrane filters, sintered metal filters, or specialized microfiltration media are more practical than woven mesh screens.
How does wire diameter affect mesh performance?
Wire diameter directly impacts open area percentage and structural strength. Thicker wire provides greater durability and pressure resistance but reduces the percentage of open area for flow. Thinner wire increases flow capacity but may be more prone to damage. Standard mesh screens balance these factors for specific applications.
Are mesh standards the same worldwide?
No, different countries use different mesh standards. US Mesh (Tyler Mesh) is common in North America, while ISO 3310-1 is used internationally. British Standard (BS) mesh differs slightly from US standards. When ordering internationally, always specify both mesh number and micron opening size to avoid confusion.
What materials are mesh screens made from?
Common materials include stainless steel (304, 316 for corrosion resistance), brass and bronze (good machinability), galvanized steel (outdoor applications), and specialized alloys like Monel or Hastelloy for extreme chemical environments. Nylon and polyester meshes are used for non-metallic applications requiring chemical resistance.
Particle Size Reference
| Material/Particle | Approximate Size | Recommended Mesh |
|---|---|---|
| Beach Sand | 1000-2000 μm | 10-18 mesh |
| Table Salt | 100-300 μm | 50-140 mesh |
| Granulated Sugar | 400-600 μm | 30-40 mesh |
| Powdered Sugar | 50-100 μm | 140-270 mesh |
| Coffee Grounds | 500-800 μm | 20-35 mesh |
| Flour (All-Purpose) | 75-150 μm | 100-200 mesh |
| Cement | 10-100 μm | 140-1250 mesh |
| Pollen | 10-100 μm | 140-1250 mesh |
| Red Blood Cells | 6-8 μm | 2500+ mesh |
| Bacteria | 0.5-5 μm | Membrane filtration |