Mesh to Micron Converter

Mesh count and micron size are two ways to describe screens, sieves, and particle separation. A mesh designation usually refers to the number of openings per linear inch of screen. A micron, also called a micrometer, is a metric length equal to one millionth of a meter. Higher mesh counts generally correspond to smaller openings, so mesh and micron values move in opposite directions. This converter uses the common approximation micron size equals 14,900 divided by mesh count. Reversing the relationship gives mesh count equals 14,900 divided by micron size. The approximation is convenient for quick estimates, comparisons, purchasing discussions, and preliminary filtration planning. For example, 100 mesh corresponds to an estimated 149 microns, while 200 mesh corresponds to about 74.5 microns. A mesh number alone does not uniquely define an opening. The wire that forms a woven screen occupies part of each inch, and different wire diameters produce different clear openings at the same mesh count. Manufacturing tolerances, weave style, screen material, and standard series also affect the result. ASTM E11, ISO 3310, Tyler, and other sieve specifications publish nominal aperture tables that may differ from a simple formula. Very fine screens may also be described by methods that do not translate cleanly to a traditional count per inch. Use this calculator as an estimating tool rather than a certification source. It can help match a desired particle scale with an approximate screen, check whether a filter is broadly suitable, or communicate between specifications written in mesh and microns. For process control, quality assurance, laboratory reporting, or regulated products, confirm the selected sieve against the manufacturer's data sheet or the governing standard. Enter only a positive value because neither an opening size nor a physical mesh count can be zero or negative. The result may be fractional, especially when converting microns to mesh. Commercial products normally use standard mesh sizes, so select the nearest appropriate available grade after considering whether your process must retain particles, pass particles, or separate a range of sizes.