Chain to Thou (Mil) Converter

Chain (ch) to Thou (Mil) (mil) Conversion

The Chain (Gunter's chain) was fundamental in surveying the American frontier. Measuring 66 feet (4 rods), it's the length of a cricket pitch. Ten square chains make an acre. Modern surveyors still reference chains in legal descriptions, and the unit remains visible in rural road layouts across the US. The Thou (also called Mil) is essential in precision engineering and manufacturing. For context, a standard sheet of paper is about 100 thou thick, while human hair measures approximately 20-30 thou in diameter. This unit is critical in machining tolerances, PCB design, and automotive engineering where exact measurements are crucial.

Conversion Formula

To convert between Chain (ch) and Thou (Mil) (mil), use the following formulas:

1 Chain (ch) = 792000 Thou (Mil) (mil)

1 Thou (Mil) (mil) = 0.0000012626262626262627 Chain (ch)

Example Conversions