Convert Caliber to Fathom
Convert calibers to fathoms instantly. 1 caliber = 0.0001388889 fathom — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Fathom to Caliber converter for the reverse conversion.
Units explained
Caliber
In length-measurement context, a caliber is a unit equal to one hundredth of an inch (2.54×10⁻⁴ m). The same word also refers to a firearm's bore diameter; in that context the value depends on the specific cartridge.
The caliber as a length unit derives from the inch by hundredth subdivision. Standardised through the 1959 International Yard and Pound Agreement.
Calibers appear in ballistics literature (alongside the more common usage as bore diameter), historical small-arms specifications, and a few precision-engineering contexts. Often confused with the cartridge-naming caliber, which is a different concept.
Length-unit usage standardised through the 1959 International Yard and Pound Agreement; the bore-diameter usage long predates this.
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.
Caliber to Fathom conversion formula
The relationship between calibers and fathoms:
To convert calibers to fathoms, multiply the value in calibers by 0.0001388889. To reverse, multiply fathoms by 7200.
How to use this converter
Type a value into the calculator. The result in fathoms updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Fathom to Caliber converter for the reverse direction.
Step-by-step: convert calibers to fathoms
- Write down the value in calibers (cl).
- Multiply that value by the factor 0.0001388889.
- The product is the equivalent value in fathoms (ftm).
- To reverse, multiply the fathom value by 7200.
Worked examples
Example 1 — Convert 1 cl to ftm:
1 × 0.0001388889 = 0.0001388889 ftm
Example 2 — Convert 100 cl to ftm:
100 × 0.0001388889 = 0.0138888889 ftm
Real-world example — Quarter-meter measurement reference
A 250,000-caliber length equals 0.25 fathoms — useful for comparing supply-chain spec sheets where some lengths are quoted in the smaller unit and some in the larger.
250000 cl × 0.0001388889 = 34.7222222222 ftm
Real-world example — From microscopic to macroscopic
A million calibers equals exactly one fathom. This kind of conversion appears in microfluidics, where total channel length is given in fathoms but feature widths are in calibers.
1000000 cl × 0.0001388889 = 138.8888888889 ftm
Real-world example — Macro-scale buildup
A million calibers equals exactly one fathom — the conversion that bridges microscale features and macroscale objects in microfluidic, biomedical, and semiconductor packaging design.
1000000 cl × 0.0001388889 = 138.8888888889 ftm
Caliber to Fathom conversion table
Standard reference values for converting calibers to fathoms:
| Caliber [cl] | Fathom [ftm] |
|---|---|
| 0.01 | 1.388889e-6 |
| 0.1 | 1.388889e-5 |
| 1 | 0.0001388889 |
| 2 | 0.0002777778 |
| 3 | 0.0004166667 |
| 4 | 0.0005555556 |
| 5 | 0.0006944444 |
| 10 | 0.0013888889 |
| 20 | 0.0027777778 |
| 30 | 0.0041666667 |
| 40 | 0.0055555556 |
| 50 | 0.0069444444 |
| 100 | 0.0138888889 |
| 500 | 0.0694444444 |
| 1000 | 0.1388888889 |
Frequently asked questions
How many fathoms is 1 caliber?
How do I convert calibers to fathoms?
How do I convert fathoms back to calibers?
How many fathoms is 100 calibers?
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Metric / SI (4 units)
Imperial / US Customary (26 units)
Sources & references
Conversion factor (1 cl = 0.0001388889 ftm) 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.