Convert Fathom to Centiinch
Convert fathoms to centiinches instantly. 1 fathom = 7200 centiinch — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Centiinch to Fathom converter for the reverse conversion.
Units explained
Fathom
A fathom is an Imperial unit of length equal to 6 feet or exactly 1.8288 meters. It is used almost exclusively for measuring water depth in maritime contexts.
The fathom derives from the Old English word fæthm, meaning "the embracing arms" — the distance between the fingertips of a person's outstretched arms. Standardized at 6 feet in English maritime tradition.
Fathoms are used in nautical depth charts, scuba diving, oceanography, and maritime literature. Despite metrication efforts, fathoms remain common in English-language nautical charts and recreational diving.
Old English origin (predating 1066); standardized at 6 feet by English maritime tradition; fixed at 1.8288 m exactly via the 1959 International Yard and Pound Agreement.
Centiinch
A centiinch is an Imperial unit of length equal to one hundredth of an inch (2.54×10⁻⁴ m). It is functionally identical to the caliber as a length unit but appears in different industrial contexts.
Derived from the inch via the metric-style prefix centi- (Latin centum, hundred). Standardised through the 1959 International Yard and Pound Agreement.
Centiinches occasionally appear in older engineering specifications and US-localised metric-pseudo notation. Most contemporary use prefers thousandths (mils) for sub-inch precision.
Standardised through the 1959 International Yard and Pound Agreement; rarely used in modern practice.
Fathom to Centiinch conversion formula
The relationship between fathoms and centiinches:
To convert fathoms to centiinches, multiply the value in fathoms by 7200. To reverse, multiply centiinches by 0.0001388889.
How to use this converter
Type a value into the calculator. The result in centiinches updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Centiinch to Fathom converter for the reverse direction.
Step-by-step: convert fathoms to centiinches
- Write down the value in fathoms (ftm).
- Multiply that value by the factor 7200.
- The product is the equivalent value in centiinches (cin).
- To reverse, multiply the centiinch value by 0.0001388889.
Worked examples
Example 1 — Convert 1 ftm to cin:
1 × 7200 = 7200 cin
Example 2 — Convert 100 ftm to cin:
100 × 7200 = 720000 cin
Real-world example — Sub-meter precision
A 0.001-fathom (1 mm) tolerance equals 1,000 centiinches — useful for surface-finish specs, where macro-scale dimensions are given in the larger unit but feature roughness in the smaller.
0.001 ftm × 7200 = 7.2 cin
Real-world example — Macro-to-micro scale comparison
2 fathoms of measurement converts to a very large number in centiinches — useful in materials science when comparing bulk-sample dimensions to feature-level surface specs.
2 ftm × 7200 = 14400 cin
Real-world example — Macroscopic to microscopic
One fathom equals a million centiinches. Optical engineers calculating coherence length compare macro-scale path lengths with micro-scale wavelength differences using exactly this conversion.
1 ftm × 7200 = 7200 cin
Fathom to Centiinch conversion table
Standard reference values for converting fathoms to centiinches:
| Fathom [ftm] | Centiinch [cin] |
|---|---|
| 0.01 | 72 |
| 0.1 | 720 |
| 1 | 7200 |
| 2 | 14400 |
| 3 | 21600 |
| 4 | 28800 |
| 5 | 36000 |
| 10 | 72000 |
| 20 | 144000 |
| 30 | 216000 |
| 40 | 288000 |
| 50 | 360000 |
| 100 | 720000 |
| 500 | 3600000 |
| 1000 | 7200000 |
Frequently asked questions
How many centiinches is 1 fathom?
How do I convert fathoms to centiinches?
How do I convert centiinches back to fathoms?
How many centiinches is 100 fathoms?
Popular length unit conversions
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Metric / SI (7 units)
Imperial / US Customary (26 units)
Nautical (1 units)
Sources & references
Conversion factor (1 ftm = 7200 cin) verified against the following authoritative sources:
- BIPM — The International System of Units (SI Brochure 9th ed.)
Official BIPM publication defining the seven SI base units (including the meter) and the rules for their use. The global authority on units of measurement.
- NIST — Guide to the SI
US National Institute of Standards and Technology reference covering the SI base and derived units with definitions and usage rules for US technical practice.
- NIST Special Publication 811 — Guide for the Use of the International System of Units
Detailed NIST guide covering exact conversion factors between SI and US customary units along with formatting and rounding conventions.
- NIST — Refinement of values for the yard and pound (Federal Register 1959)
The treaty (signed by US
- International Astronomical Union — System of Astronomical Constants
The IAU defines astronomical units including the AU (149597870700 m exactly) light-year and parsec used in astronomy and astrophysics.