Convert Foot to Parsec
Convert feet to parsecs instantly. 1 foot = 9.877895e-18 parsec — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Parsec to Foot converter for the reverse conversion.
Units explained
Foot
A foot is an Imperial and US customary unit of length equal to 12 inches or exactly 0.3048 meters. It is the most commonly used unit of length in everyday measurement in the United States.
The foot's origin is literally the length of a human foot, used as a measurement standard since antiquity. The English foot was standardized at various points in history; the modern international foot (0.3048 m exactly) was fixed by the 1959 International Yard and Pound Agreement.
Feet are used in the US for body height, building dimensions, room sizes, road sign clearances, aviation altitude (feet above sea level), and most everyday distance estimation. The UK uses feet informally for height despite officially being metric.
Used since antiquity; standardized to 0.3048 m exactly by the International Yard and Pound Agreement of 1959. Aviation worldwide uses feet for altitude despite metric adoption elsewhere.
Parsec
A parsec (parallax-second) is a distance unit equal to 648,000/π astronomical units — approximately 3.086×10¹⁶ m (3.26 light years). It is the standard distance unit in professional astronomy.
Defined as the distance at which one astronomical unit subtends an angle of one arcsecond. IAU Resolution B2 in 2015 made this an exact definition: 1 pc = (648,000/π) AU.
Parsecs are used in professional astronomy for stellar distances (Proxima Centauri ≈ 1.3 pc), galactic-scale distances (with prefixes kiloparsec and megaparsec), and parallax measurements. Standard since the early 20th century.
Concept introduced by Herbert Hall Turner in 1913; exact definition via the AU adopted by IAU Resolution B2 in 2015.
Foot to Parsec conversion formula
The relationship between feet and parsecs:
To convert feet to parsecs, multiply the value in feet by 9.877895e-18. To reverse, multiply parsecs by 1.012361e+17.
How to use this converter
Type a value into the calculator. The result in parsecs updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Parsec to Foot converter for the reverse direction.
Step-by-step: convert feet to parsecs
- Write down the value in feet (ft).
- Multiply that value by the factor 9.877895e-18.
- The product is the equivalent value in parsecs (pc).
- To reverse, multiply the parsec value by 1.012361e+17.
Worked examples
Example 1 — Convert 1 ft to pc:
1 × 9.877895e-18 = 9.877895e-18 pc
Example 2 — Convert 100 ft to pc:
100 × 9.877895e-18 = 9.877895e-16 pc
Real-world example — Maritime depth conversion
A 10-foot sounding depth converts cleanly into parsecs. Recreational divers and sailors translate between the two units whenever they read legacy charts against modern depth-sounder displays.
10 ft × 9.877895e-18 = 9.877895e-17 pc
Real-world example — Reference scenario in case of fallback
Conversion between human-scale length units is the everyday workflow of architecture, athletics, and apparel design — three of the most common contexts that span metric and imperial systems.
1 ft × 9.877895e-18 = 9.877895e-18 pc
Real-world example — Adult height conversion
A 1.8-foot-tall person measures a value in parsecs that converts the height to the unit favoured by American forms, schools, or driver's licences. This is daily routine for anyone living between metric and imperial systems.
1.8 ft × 9.877895e-18 = 1.778021e-17 pc
Foot to Parsec conversion table
Standard reference values for converting feet to parsecs:
| Foot [ft] | Parsec [pc] |
|---|---|
| 0.01 | 9.877895e-20 |
| 0.1 | 9.877895e-19 |
| 1 | 9.877895e-18 |
| 2 | 1.975579e-17 |
| 3 | 2.963369e-17 |
| 4 | 3.951158e-17 |
| 5 | 4.938948e-17 |
| 10 | 9.877895e-17 |
| 20 | 1.975579e-16 |
| 30 | 2.963369e-16 |
| 40 | 3.951158e-16 |
| 50 | 4.938948e-16 |
| 100 | 9.877895e-16 |
| 500 | 4.938948e-15 |
| 1000 | 9.877895e-15 |
Frequently asked questions
How many parsecs is 1 foot?
How do I convert feet to parsecs?
How do I convert parsecs back to feet?
How many parsecs is 100 feet?
Popular length unit conversions
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Metric / SI (18 units)
Imperial / US Customary (26 units)
Nautical (1 units)
Astronomical (9 units)
Atomic / Physics (6 units)
Typographic (3 units)
Sources & references
Conversion factor (1 ft = 9.877895e-18 pc) 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.