Mesh to Micron Calculator

Mesh ↔ Micron Converter

Enter a value and press convert. The tool interpolates geometrically between standard sieve apertures, so it also returns a usable figure for mesh numbers that are not in the published tables.

Mesh to Micron Reference Table

Full conversion chart for the selected standard. Switch standards to rebuild the table instantly.

Coarse and medium sieves (3–80 mesh)

Fine sieves (100–635 mesh)

Ultrafine sizes: nominal mesh above 635

No woven sieve exists below 635 mesh (20 µm). The mesh numbers below are the nominal trade equivalents still used in quotation across Asia — they are calculated, not measured, so always pair them with a D50 / D97 figure. The convention itself runs out at 12500 mesh (1 µm); below that, only microns and surface area are meaningful.

Where Mesh Stops Working: D50, D97 and Air Classification

A mesh number is a sieve concept. It works from 4 mesh (4.75 mm) down to 635 mesh (20 µm), where two things break down at once: the wire cloth becomes too fragile to weave accurately, and fine particles stop behaving independently because van der Waals forces make them agglomerate. Trade still quotes 1250 or 3000 mesh above that point, but those are nominal equivalents — the table above converts them, and nothing below 20 µm should be accepted as a sieve specification.

That is why modern powder specifications are written as a particle size distribution measured by laser diffraction, not as a mesh count:

• D50 — median: 50 % of the volume is finer, 50 % coarser. Drives flowability, packing density and reaction rate.
• D90 — 90 % of the volume is finer. Controls the coarse tail that causes screening rejects.
• D97 — 97 % of the volume is finer. The usual contractual guarantee for ultrafine powders, because it is what prevents surface defects, nozzle blocking and inconsistent sintering.
• Specific surface area (m²/g) — often the real purchasing criterion for catalysts, battery materials and fillers.

A useful rule of thumb: mesh describes the ceiling, D97 describes the guarantee. A “325 mesh” calcium carbonate can have a D50 anywhere between roughly 8 µm and 20 µm depending on how it was classified — and those two products behave completely differently in a coating or a polymer compound.

From Target Size to the Right Mill

Use your converted micron value to pick the grinding and classification route. This is the selection logic EPIC process engineers apply during feasibility trials.

* Mesh numbers above 635 are nominal conversions only. Woven wire sieves are not used for routine quality control below 20 µm.

Jet Mill MQW / MQL / MQP

Media-free grinding, D97 from 2 to 45 µm, no iron pickup — the standard route for battery materials and high-purity ceramics.

View jet mill range →

Air Classifier HTS / ITC / MBS / CTC / TDC

Five classifier families, cut points from 2 to 150 µm, standalone or closed-circuit with any mill.

View classifier range →

Air Classifier Mill MJW

Grinding and classification in one housing for 10–45 µm production, with a far lower energy cost than a jet mill in that band.

View MJW series →

Laboratory & Pilot Mills

Confirm your D50 / D97 target on 50 g to 5 kg before committing to a production line.

Book a feasibility test →

Real Target Sizes by Material

Convert first, then compare against what these materials actually run at in production. Figures below are typical commercial specifications, not limits.

Ultrafine grinding of natural graphite

How a D50 of 12 µm with a controlled coarse tail is reached for lithium-ion anode material.

Read the battery material case →

Cobalt hydroxide by jet mill

A D97 of 12 µm with no metallic contamination — why media-free grinding is mandatory here.

See the MQL jet mill →

Creatine monohydrate micronisation

A food-grade application where a 100 mesh specification still works — and where it starts to break down.

Explore jet mills →

How to Specify Particle Size When You Request a Quote

A mill cannot be sized from a mesh number alone. Two powders with an identical top size can differ by a factor of three in specific energy consumption, depending on hardness, friability, moisture and the shape of the coarse tail. Send this instead:

1. Material name and purity, plus bulk density and Mohs hardness if known.
2. Target D50 and D97 in microns — not a mesh number.
3. Measurement method: laser diffraction (wet or dry), sedimentation, or sieve.
4. Required throughput in kg/h, and whether it is continuous or batch.
5. Contamination limits — for example iron below 20 ppm, which rules out media mills.
6. Thermal and safety constraints: melting point, decomposition temperature, solvent content, ATEX / dust explosion class.
7. Downstream requirement, such as surface modification, coating, granulation or packaging.

Surface modification and coating

Once the particle size is right, most filler applications also need a surface treatment. Stearic acid coating on calcium carbonate, for example, is done inline in a continuous coating system immediately after grinding — coating a powder that has already cooled and agglomerated gives a far less uniform result.

This is a fine-powder step, not a coarse one: the feed is normally everything passing 325 mesh (45 µm), production runs from about 1250 mesh (10 µm) down to D97 3 µm, and 95 % activation is the usual acceptance figure. A 45–150 µm powder is too coarse to coat economically — its specific surface is small, so there is little area for the modifier to bond to and the dose per tonne climbs.

EPIC builds four dedicated coating machines for this step: the three-rotor CRM (325–3000 mesh, stearic acid, self-heating), the honeycomb mill MRD (dries filter cake and coats in one pass), the pin mill coating machine PM (highest shear, down to D97 3 µm) and the turbo mill RTM (heat-sensitive and fibrous powders).

See continuous coating systems →

Frequently Asked Questions

Mesh, micron and particle size basics

Measurement limits and sieve standards

Specifying a job and choosing equipment

Related Equipment and Resources

• Jet mills — spiral, horizontal and vertical fluidized bed designs for D97 down to 2 µm
• Air classifiers — MBS, ITC, HTS, CTC and TDC series, cut points from 2 to 150 µm
• Air classifier mills MJW — integrated grinding and classification, 10–45 µm
• Pin mill MJL and MJL-P — the 45–150 µm grinding workhorses
• Turbo mill RTM — medium-fine grinding with in-line classification
• Ball mill classifier system — high-capacity calcium carbonate and limestone lines
• Laboratory mills — validate your D50 / D97 target before scale-up
• Continuous coating systems — surface modification after grinding
• All powder machinery