Millimeter is 0.001 meter units.
Millimeters to Fathoms Converter — mm to ftm
Convert Millimeter (mm) to Fathom (ftm) using the exact conversion factor (1 millimeter = 0.0005468066 fathom). See the formula, worked examples, conversion table, history, and common uses.
Millimeters to Fathoms converter
Converter
Length Converter
Convert SI, imperial, US customary, astronomical, scientific, and historical length units.
Context values
Some unit families need one extra value for a physically accurate result.
A fathom is six feet.
Result = input x 0.001 / 1.8288.
Length uses the meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Millimeters to Fathoms
Millimeter and Fathom both measure length. Millimeter is most often used for engineering drawings and manufacturing tolerances worldwide (including in the us).
Formula
fathoms = millimeters × 0.000546806649169
This factor comes from each unit's defined relationship to the category's base unit: 1 millimeter equals 0.001 base units, and 1 fathom equals 1.8288 base units, so dividing one by the other gives the direct millimeter-to-fathom factor of 0.000546806649169.
Simple example
1 mm × 0.0005468066492 = 0.0005468066 ftm
1 millimeter = 0.0005468066 fathoms.
Real-world example
10 mm × 0.0005468066492 = 0.0054680665 ftm
10 millimeters = 0.0054680665 fathoms.
Conversion table
| Millimeter (mm) | Fathom (ftm) |
|---|---|
| 1 mm | 0.0005468066 ftm |
| 5 mm | 0.0027340332 ftm |
| 10 mm | 0.0054680665 ftm |
| 21.0975 mm | 0.0115362533 ftm |
| 42.195 mm | 0.0230725066 ftm |
| 100 mm | 0.0546806649 ftm |
Reverse conversion: Fathom to Millimeter
0.0005468066 ftm × 1828.8 = 0.9999999101 mm
0.0005468066 fathoms = 0.9999999101 millimeters.
millimeters = fathoms × 1828.8
For a page dedicated to this direction, see Fathom to Millimeter.
Understanding the Millimeter
Millimeter (mm) measures distance. A millimeter is one-thousandth of a meter. It is classified as a SI derived (metric prefix) unit.
Where it's used: Standard small/precision length unit worldwide, including in US engineering and manufacturing
Uses of the Millimeter today
- Engineering drawings and manufacturing tolerances worldwide (including in the US)
- Rainfall measurement in most countries
- Small-scale everyday measurement (screen sizes, hardware)
History of the Millimeter
The millimeter follows from the meter via the 'milli-' SI prefix (10⁻³). It is notable as one of the few metric units in routine US technical/engineering use, since precision manufacturing and electronics are often specified in millimeters even in the US.
Historical origin. Millimeter was not the invention of a single named person; it developed through the process described above.
Understanding the Fathom (ftm)
A fathom is six feet.
Millimeter — sources
- BIPM SI Brochure — SI prefixes — Defines 'milli-' as the prefix for 10⁻³.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many fathoms are in 1 millimeter?
1 millimeter equals 0.0005468066 fathoms, using the exact defined conversion factor rather than an estimate.
How do I convert millimeter to fathom?
Multiply the millimeter value by 0.0005468066492. The converter above does this instantly to whatever precision you set.
How do I convert fathom back to millimeter?
Use the reverse factor: 1 fathom equals 1,828.8 millimeters. You can also use the swap control in the converter above to flip the direction instantly.
What is a millimeter?
Millimeter (mm) measures distance. A millimeter is one-thousandth of a meter. It is classified as a SI derived (metric prefix) unit.
What is a fathom?
Fathom (ftm) is a unit of length.
Is the millimeter to fathom conversion exact?
Yes. Both millimeter and fathom are defined by fixed standards rather than physical artifacts, so the factor of 0.0005468066492 used above is exact to as many digits as you choose to display.
Where is the millimeter still used today?
Standard small/precision length unit worldwide, including in US engineering and manufacturing