Convert Thou to Fathoms
Convert Thou (th) to Fathoms (ftm) instantly and accurately.
Conversion Formula
ftm = th × 1.388888889e-5
About Thou
A thou (also called mil) is one thousandth of an inch, equal to 0.0254 millimeters or 25.4 micrometers. This unit is commonly used in engineering and manufacturing in countries that use imperial measurements, particularly for specifying tolerances, wire gauges, and thin material thicknesses. For example, a standard plastic bag might be 1-2 thou thick, a sheet of paper is about 4 thou, and precision machined parts often have tolerances measured in thou. Electronic circuit board copper traces are typically 1.4 thou thick.
About Fathoms
A fathom (ftm) is equal to 6 feet or 1.8288 meters, traditionally based on the span of a man's outstretched arms. This unit has been used for centuries in maritime navigation to measure water depth and rope or cable lengths. While largely replaced by meters in modern nautical charts, fathoms remain in use by sailors and in naval traditions. The Mariana Trench, Earth's deepest point, reaches about 6,000 fathoms. The term 'to fathom' meaning 'to understand' derives from this nautical unit.
Quick Reference Table
| Thou (th) | Fathoms (ftm) |
|---|---|
| 1 th | 1.389 × 10-5 ftm |
| 2 th | 2.778 × 10-5 ftm |
| 5 th | 6.944 × 10-5 ftm |
| 10 th | 0.000138889 ftm |
| 25 th | 0.000347222 ftm |
| 50 th | 0.000694444 ftm |
| 100 th | 0.00138889 ftm |