Convert length and distance units — meters, feet, inches, kilometers, miles, light years and more.
| Unit | Name | Value |
|---|---|---|
| 0.001 pc | 1.68745e+13 ftm | |
| 0.01 pc | 1.68745e+14 ftm | |
| 0.1 pc | 1.687e+15 ftm | |
| 1 pc | 1.687e+16 ftm | |
| 5 pc | 8.437e+16 ftm | |
| 10 pc | 1.687e+17 ftm | |
| 50 pc | 8.437e+17 ftm | |
| 100 pc | 1.687e+18 ftm | |
| 1000 pc | 1.687e+19 ftm |
Multiply the number of Parsecs by 1.6874×1016 to get Fathoms. Formula: ftm = pc × 1.6874×1016. Example: 10 pc × 1.6874×1016 = 1.6874×1017 ftm. To reverse, divide Fathoms by 1.6874×1016 to get Parsecs.
| Parsec (pc) | Fathom (ftm) |
|---|---|
| 0.001 pc | 1.6874×1013 ftm |
| 0.01 pc | 1.6874×1014 ftm |
| 0.1 pc | 1.6874×1015 ftm |
| 0.5 pc | 8.4372×1015 ftm |
| 1 pc | 1.6874×1016 ftm |
| 2 pc | 3.3749×1016 ftm |
| 5 pc | 8.4372×1016 ftm |
| 10 pc | 1.6874×1017 ftm |
| 20 pc | 3.3749×1017 ftm |
| 50 pc | 8.4372×1017 ftm |
| 100 pc | 1.6874×1018 ftm |
| 250 pc | 4.2186×1018 ftm |
| 500 pc | 8.4372×1018 ftm |
| 1000 pc | 1.6874×1019 ftm |
| 10000 pc | 1.6874×1020 ftm |
To convert Parsec to Fathom, multiply by 1.6874×1016. Example: 10 pc = 1.6874×1017 ftm
To convert Fathom back to Parsec, divide by 1.6874×1016 (multiply by 5.9261×10-17). Use the swap button above.
Start with 100 Parsecs = 1.6874×1018 ftm as your reference point. Scale up or down from there.
Physics and astronomy courses at naval academies use parsec-to-fathom conversion to bridge operational maritime measurement (fathoms) with stellar astronomy (parsecs) — connecting students' professional measurement world with the cosmic scale.
1 pc = 1.687×10¹⁶ fathoms — 16.9 quadrillion fathoms. Science communicators use this for maritime audiences: "The nearest star is 1.3 parsecs away — that's 22 quadrillion fathoms, as if every fathom of the Pacific Ocean were a single step to the stars."
The fathom measured ocean depth in Magellan's circumnavigation (1519–22). The parsec was defined in 1913. These two units span 400 years of human exploration — from charting Earth's ocean floors to measuring stellar distances.
Science venues combining ocean and space themes use fathom-to-parsec comparisons to show visitors the full scale of human measurement and exploration — from the deep ocean to the nearest star.
Physics courses use parsec-to-fathom in problem sets requiring conversion between astronomical and archaic maritime units — testing systematic dimensional analysis across the full range of standardised length units.
Complete unit converters include parsec-to-fathom for researchers and educators working across maritime science and stellar astrophysics literature where both measurement traditions appear in the same interdisciplinary context.
The Parsec is a unit of Length measurement (symbol: pc). 1 pc = 1.6874×1016 ftm. Used in scientific and practical Length measurement applications.
The Fathom is a unit of Length measurement (symbol: ftm). It is part of an internationally recognised measurement system used alongside the Parsec.
The parsec was introduced in 1913 by British astronomer Herbert Hall Turner, who needed a practical unit for expressing stellar distances measured by parallax. The name is a portmanteau of 'parallax' and 'arcsecond' — a parsec is the distance at which one astronomical unit (the Earth-Sun distance) subtends an angle of exactly one arcsecond. This geometric definition makes parsecs directly useful: a star with a measured parallax of 1 arcsecond is exactly 1 parsec away, requiring no intermediate conversion. 1 parsec equals approximately 3.086×10¹³ kilometres or 3.262 light-years. Professional astronomers overwhelmingly prefer parsecs over light-years because parallax astrometry — the primary distance measurement tool — yields distances in parsecs directly.
The fathom derives from the Old English 'fæthm', meaning the span of outstretched arms — roughly 6 feet or 1.8 metres. It was the primary depth measurement unit used by mariners for millennia. The word 'fathom' also entered English as a verb meaning to understand something deeply. Despite metrication, fathoms remain on admiralty charts worldwide.
Common use: Parsec to Fathom conversion is needed when working with international standards, scientific publications, or reference materials that use different unit systems for Length measurement.