Convert length and distance units — meters, feet, inches, kilometers, miles, light years and more.
| Unit | Name | Value |
|---|---|---|
| 0.001 ftm | 5.926e-20 pc | |
| 0.01 ftm | 5.926e-19 pc | |
| 0.1 ftm | 5.926e-18 pc | |
| 1 ftm | 5.926e-17 pc | |
| 5 ftm | 2.963e-16 pc | |
| 10 ftm | 5.926e-16 pc | |
| 50 ftm | 2.963e-15 pc | |
| 100 ftm | 5.926e-15 pc | |
| 1000 ftm | 5.926e-14 pc |
Multiply the number of Fathoms by 5.9261×10-17 to get Parsecs. Formula: pc = ftm × 5.9261×10-17. Example: 10 ftm × 5.9261×10-17 = 5.9261×10-16 pc. To reverse, divide Parsecs by 5.9261×10-17 to get Fathoms.
| Fathom (ftm) | Parsec (pc) |
|---|---|
| 0.001 ftm | 5.9261×10-20 pc |
| 0.01 ftm | 5.9261×10-19 pc |
| 0.1 ftm | 5.9261×10-18 pc |
| 0.5 ftm | 2.9631×10-17 pc |
| 1 ftm | 5.9261×10-17 pc |
| 2 ftm | 1.1852×10-16 pc |
| 5 ftm | 2.9631×10-16 pc |
| 10 ftm | 5.9261×10-16 pc |
| 20 ftm | 1.1852×10-15 pc |
| 50 ftm | 2.9631×10-15 pc |
| 100 ftm | 5.9261×10-15 pc |
| 250 ftm | 1.4815×10-14 pc |
| 500 ftm | 2.9631×10-14 pc |
| 1000 ftm | 5.9261×10-14 pc |
| 10000 ftm | 5.9261×10-13 pc |
To convert Fathom to Parsec, multiply by 5.9261×10-17. Example: 10 ftm = 5.9261×10-16 pc
To convert Parsec back to Fathom, divide by 5.9261×10-17 (multiply by 1.6874×1016). Use the swap button above.
Start with 100 Fathoms = 5.9261×10-15 pc as your reference point. Scale up or down from there.
1 fathom = 5.926×10⁻¹⁷ parsecs. This conversion spans 17 orders of magnitude — from a unit used to measure ocean depth to one used to measure interstellar distances. Physics educators use it as the most extreme common unit conversion.
Popular science writers use fathom-to-parsec comparisons to make interstellar distances viscerally strange: "The nearest star is 1.3 parsecs — that's 22 quadrillion fathoms. Every fathom of ocean depth, quadrillion times over."
The fathom measured ocean depth in Magellan's voyage (1519–1522). The parsec was coined in 1913. Comparing them traces 400 years of human exploration — from measuring the depths of the Pacific to measuring stellar distances.
University physics problem sets include fathom-to-parsec to challenge students with a 17-step unit conversion chain — testing systematic application of SI prefixes and conversion factors across extreme scales.
Complete unit conversion databases include fathom-to-parsec for historical and scientific completeness — covering the full range from maritime surveying to stellar astrophysics in a single coherent system.
Aquariums and maritime museums use fathom-to-parsec displays to connect their ocean-focused audiences with astronomy — showing how measurement systems designed for opposite ends of the scale universe actually connect.
The Fathom is a unit of Length measurement (symbol: ftm). 1 ftm = 5.9261×10-17 pc. Used in scientific and practical Length measurement applications.
The Parsec is a unit of Length measurement (symbol: pc). It is part of an internationally recognised measurement system used alongside the Fathom.
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, recorded in the Bible and used by ancient Greeks. Samuel Pepys referenced fathoms in 17th-century naval logs. The word 'fathom' also entered English as a verb meaning to understand something deeply — from the idea of plumbing the depths. Despite metrication, fathoms remain on admiralty charts worldwide.
The parsec was introduced in 1913 by British astronomer Herbert Hall Turner as a practical unit for stellar parallax measurements. It equals the distance at which 1 astronomical unit subtends 1 arcsecond — approximately 3.086×10¹³ kilometres or 3.26 light-years. The name blends 'parallax' and 'arcsecond'. Professional astronomers strongly prefer parsecs over light-years because parallax directly yields distance in parsecs without intermediate calculation.
Common use: Fathom to Parsec conversion is needed when working with international standards, scientific publications, or reference materials that use different unit systems for Length measurement.