Fathom to Mil/Thou Converter
Convert Fathom (ftm) to Mil/Thou (mil) instantly. 1 ftm = 72,000 mil.
Length Converter
31 units available
1 ftm = 72,000 mil
Formula:
mil = ftm × 72,000With your value: 1 ftm = 72,000 mil
How big is that?
Everyday references on a logarithmic scale, all expressed in fathom so you can sanity-check the result.
Other Fathom to Mil/Thou conversions
Fathom to Mil/Thou Conversion Table
| Fathom (ftm) | Mil/Thou (mil) |
|---|---|
| 0.5 | 36,000 |
| 1 | 72,000 |
| 2 | 144,000 |
| 5 | 360,000 |
| 10 | 720,000 |
| 15 | 1,080,000 |
| 20 | 1,440,000 |
| 25 | 1,800,000 |
| 50 | 3,600,000 |
| 100 | 7,200,000 |
| 250 | 18,000,000 |
| 500 | 36,000,000 |
| 1000 | 72,000,000 |
Mil/Thou to Fathom Conversion Table
| Mil/Thou (mil) | Fathom (ftm) |
|---|---|
| 0.5 | 6.944444e-6 |
| 1 | 1.388889e-5 |
| 2 | 2.777778e-5 |
| 5 | 6.944444e-5 |
| 10 | 0.000139 |
| 15 | 0.000208 |
| 20 | 0.000278 |
| 25 | 0.000347 |
| 50 | 0.000694 |
| 100 | 0.001389 |
| 250 | 0.003472 |
| 500 | 0.006944 |
| 1000 | 0.013889 |
Where these values come from
Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.
Fathom (ftm)
Length
Traceable to the metre, defined by fixing the speed of light in vacuum at 299 792 458 m/s. Imperial lengths derive from the 1959 international yard (0.9144 m exactly).
Source: BIPM, The International System of Units (SI), 9th edition, 2019 (updated 2024)
Bureau International des Poids et Mesures · Reviewed 2026-07-01
Mil/Thou (mil)
Length
Traceable to the metre, defined by fixing the speed of light in vacuum at 299 792 458 m/s. Imperial lengths derive from the 1959 international yard (0.9144 m exactly).
Source: BIPM, The International System of Units (SI), 9th edition, 2019 (updated 2024)
Bureau International des Poids et Mesures · Reviewed 2026-07-01
How to Convert Fathom to Mil/Thou
To convert from Fathom (ftm) to Mil/Thou (mil), multiply the value by 72,000.
Formula: mil = ftm × 72,000
Reverse: ftm = mil × 0.0000138889
Step-by-Step Example
- Start with your value in Fathom. For example: 5 ftm
- Multiply by the conversion factor: 5 x 72,000
- The result is: 360,000 mil
About Fathom
The fathom equals 6 feet (1.8288 m) and is the traditional unit for water depth on nautical charts.
Fun Fact: The word comes from the Old English "fæðm", the span of a man's outstretched arms.
Common uses: sounding depth, nautical charts, diving.
About Mil/Thou
A mil (or thou) is one thousandth of an inch, 25.4 micrometres. US manufacturing uses it for sheet, film and coating thickness.
Common uses: plastic film, PCB traces, coating thickness.
Frequently Asked Questions
How many Mil/Thou are in 1 Fathom?
There are exactly 72,000 Mil/Thou in 1 Fathom. This means the conversion factor from Fathom to Mil/Thou is 72,000.
What is the formula to convert Fathom to Mil/Thou?
The formula to convert Fathom to Mil/Thou is: mil = ftm × 72,000. For example, to convert 10 Fathom to Mil/Thou, you would multiply 10 by 72,000.
What is a Fathom?
The fathom equals 6 feet (1.8288 m) and is the traditional unit for water depth on nautical charts.
What is a Mil/Thou?
A mil (or thou) is one thousandth of an inch, 25.4 micrometres. US manufacturing uses it for sheet, film and coating thickness.
What are the common uses of Fathom?
The Fathom is commonly used in sounding depth, nautical charts, diving.
Related Length Conversions
Cite this page
UnitConvertLab. (2026). Fathom to Mil/Thou converter. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/fathom-to-mil