# Mesh to Micron Converter

URL: https://speedycalculator.com/calculators/conversion/mesh-to-micron-converter/
Last updated: 2026-10-25

> The mesh to micron converter gives the opening size of a U.S. standard sieve (ASTM E11) for each mesh number, in microns, millimetres and inches.

## Inputs

- Mesh (U.S. sieve number)

## Results

- Opening size
- In millimetres

## Formula

```
opening size = value from the ASTM E11 sieve table
```

## Explanation

Mesh number counts openings per linear inch, but the actual opening also depends on wire thickness, so there is no simple formula. Standard sieves follow the ASTM E11 table used here; a 200-mesh sieve passes particles up to 74 µm.

### How to use the Mesh to Micron Converter

- **Mesh (U.S. sieve number)**

Results update as you type, and every field accepts the units shown in its menu.

### How it works

Choose a mesh number and the calculator returns the nominal opening from the standard table.

### U.S. sieve sizes

MeshOpening (µm)Opening (in)367300.2650447600.1874540000.1575633600.1323728300.1114823800.09371020000.07871216800.06611414100.05551611900.04691810000.0394208410.0331257070.0278305950.0234355000.0197404200.0165453540.0139502970.0117602500.0098702100.0083801770.00701001490.00591201250.00491401050.0041170880.0035200740.0029230630.0025270530.0021325440.0017400370.0015

### What each result means

- **Opening size** = [Mesh (U.S. sieve number)] × 1e-6
- **In millimetres** = [Mesh (U.S. sieve number)] ÷ 1000

## Worked example

Inputs — Mesh (U.S. sieve number): No. 200.

Results — **Opening size = 74 µm**; In millimetres = 0.074 mm.

## FAQ

**What size is 200 mesh in microns?**
74 µm.

**What is the difference between mesh and micron?**
Mesh counts openings per inch; micron is the opening size itself.

**What formula does the Mesh to Micron Converter use?**
opening size = value from the ASTM E11 sieve table.


## Sources

- [ASTM E11 – Standard Specification for Woven Wire Test Sieve Cloth and Test Sieves](https://www.astm.org/e0011-22.html)