This page allows you to convert length values **expressed in thou** to **their equivalent in mils**.

Enter the value in thou in the top field (the one marked "thou"), then press the "Convert" button or the "Enter" key. The converter also works the other way round: if you enter the value in mils in the "mil" field, the equivalent value in thou is calculated and displayed in the top field.

Where L_{thou} is the length in thou and L_{mils} is its equivalent in mils.

The **thou** is a unit of measure for length equivalent to 1/1000 of an inch, that is 0.001 inches. It is also known as 'mil'. Introduced around 1844, it is still used today in manufacturing specifications of certain products such as printed circuit boards (ex. size of via holes and distance between lines), paper thickness (ex. newspaper paper thickness is around 2 to 4 thou), latex gloves. Reference: Wikipedia

The **mil** is a unit of measure typically used in manufacturing and engineering for describing distance tolerances with high precision or for specifying the thickness of materials. One mil is equal to one thousandth of an inch, or 10^{-3} inches.

The mil is also referred to as thou.

The closest unit to the mil in the metric system is the micrometer: One mil is equal to 25.4 µm.