The US survey foot is 1200/3937 meters and is retained for legacy land records.
US survey feet to Parsecs Converter — ftUS to pc
Convert US survey foot (ftUS) to Parsec (pc) using the exact conversion factor (1 us survey foot = 9.877915e-18 parsec). See the formula, worked examples, conversion table, history, and common uses.
US survey feet to Parsecs 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 parsec is about 3.26156 light-years.
Result = input x 0.3048006096 / 3.08567758e+16.
Length uses the meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting US survey feet to Parsecs
US survey foot and Parsec both measure length. Specifically: The US survey foot is 1200/3937 meters and is retained for legacy land records, and a parsec is about 3.26156 light-years.
Formula
parsecs = us survey feet × 9.877915e-18
This factor comes from each unit's defined relationship to the category's base unit: 1 us survey foot equals 0.304800609601 base units, and 1 parsec equals 3.085678e+16 base units, so dividing one by the other gives the direct us survey foot-to-parsec factor of 9.877915e-18.
Simple example
1 ftUS × 9.877915e-18 = 9.877915e-18 pc
1 us survey foot = 9.877915e-18 parsecs.
Real-world example
10 ftUS × 9.877915e-18 = 9.877915e-17 pc
10 us survey feet = 9.877915e-17 parsecs.
Conversion table
| US survey foot (ftUS) | Parsec (pc) |
|---|---|
| 1 ftUS | 9.877915e-18 pc |
| 5 ftUS | 4.938958e-17 pc |
| 10 ftUS | 9.877915e-17 pc |
| 21.0975 ftUS | 2.083993e-16 pc |
| 42.195 ftUS | 4.167986e-16 pc |
| 100 ftUS | 9.877915e-16 pc |
Reverse conversion: Parsec to US survey foot
9.877915e-18 pc × 1.012359e+17 = 0.999999997 ftUS
9.877915e-18 parsecs = 0.999999997 us survey feet.
us survey feet = parsecs × 1.012359e+17
For a page dedicated to this direction, see Parsec to US survey foot.
Understanding the US survey foot (ftUS)
The US survey foot is 1200/3937 meters and is retained for legacy land records.
Understanding the Parsec
Parsec (pc) measures astronomical distance. The distance at which one astronomical unit subtends an angle of one arcsecond — approximately 3.26 light-years, or about 3.086 × 10¹⁶ meters. It is classified as a non-SI unit used in astronomy.
Where it's used: Standard distance unit throughout professional astronomy worldwide
Uses of the Parsec today
- Measuring distances to nearby stars via parallax
- Galactic and extragalactic distance scales in astrophysics research
History of the Parsec
The name is a portmanteau of 'parallax' and 'arcsecond,' reflecting how the unit is defined directly from the parallax method astronomers use to measure stellar distances: the tiny apparent shift in a nearby star's position as Earth orbits the Sun.
Historical origin. Parsec was not the invention of a single named person; it developed through the process described above.
Parsec — sources
- IAU (International Astronomical Union) — parsec definition — Standard astronomical definition of the parsec via stellar parallax.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many parsecs are in 1 us survey foot?
1 us survey foot equals 9.877915e-18 parsecs, using the exact defined conversion factor rather than an estimate.
How do I convert us survey foot to parsec?
Multiply the us survey foot value by 9.877915e-18. The converter above does this instantly to whatever precision you set.
How do I convert parsec back to us survey foot?
Use the reverse factor: 1 parsec equals 1.012359e+17 us survey feet. You can also use the swap control in the converter above to flip the direction instantly.
What is a us survey foot?
US survey foot (ftUS) is a unit of length.
What is a parsec?
Parsec (pc) measures astronomical distance. The distance at which one astronomical unit subtends an angle of one arcsecond — approximately 3.26 light-years, or about 3.086 × 10¹⁶ meters. It is classified as a non-SI unit used in astronomy.
Is the us survey foot to parsec conversion exact?
Yes. Both us survey foot and parsec are defined by fixed standards rather than physical artifacts, so the factor of 9.877915e-18 used above is exact to as many digits as you choose to display.