Convert Kilometer to Kiloparsec
Convert kilometers to kiloparsecs instantly. 1 kilometer = 3.240779e-17 kiloparsec — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Kiloparsec to Kilometer converter for the reverse conversion.
Units explained
Kilometer
A kilometer is a metric unit of length equal to one thousand meters. It is the standard unit for measuring road distances, geographic distances, and other large-scale measurements in metric countries.
The kilometer was defined alongside the meter in 1795 using the standard SI prefix kilo- (from Greek chilioi, "thousand"), denoting one thousand units.
Kilometers are used worldwide (except the United States and a few others) for road signage, geographic distance, athletic events, and scientific distances at planetary scale. Speed limits in most countries are given in km/h.
Adopted 1795 in France as part of the original metric system; the kilometer became the global standard for road and geographic distance through the 19th and 20th century metric adoption.
Kiloparsec
A kiloparsec is a distance unit equal to 1,000 parsecs (about 3.09×10¹⁹ m). It is used to express galactic-scale distances.
Combines the metric-style prefix kilo- with the parsec. Standardised in astronomy as the natural unit for distances within and between galaxies.
Kiloparsecs are used to express galactic radii (the Milky Way is roughly 8 kpc from center to Sun), galactic-cluster scales, and distances within the Local Group.
Exact via the parsec; standardised by IAU 2015 along with parsec.
Kilometer to Kiloparsec conversion formula
The relationship between kilometers and kiloparsecs:
To convert kilometers to kiloparsecs, multiply the value in kilometers by 3.240779e-17. To reverse, multiply kiloparsecs by 3.085678e+16.
How to use this converter
Type a value into the calculator. The result in kiloparsecs updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Kiloparsec to Kilometer converter for the reverse direction.
Step-by-step: convert kilometers to kiloparsecs
- Write down the value in kilometers (km).
- Multiply that value by the factor 3.240779e-17.
- The product is the equivalent value in kiloparsecs (kpc).
- To reverse, multiply the kiloparsec value by 3.085678e+16.
Worked examples
Example 1 — Convert 1 km to kpc:
1 × 3.240779e-17 = 3.240779e-17 kpc
Example 2 — Convert 100 km to kpc:
100 × 3.240779e-17 = 3.240779e-15 kpc
Real-world example — Maritime exclusion zone
A 200-kilometer exclusion zone (a common maritime boundary) converts to a different value in kiloparsecs that's useful when describing the same zone in everyday land-distance units.
200 km × 3.240779e-17 = 6.481559e-15 kpc
Real-world example — Coastal cruise distances
A 10-kilometer coastal sailing route converts to a different value in kiloparsecs — useful for cruise operators who switch between maritime, aviation, and road-distance units depending on the leg of the trip.
10 km × 3.240779e-17 = 3.240779e-16 kpc
Real-world example — Road-sign distances across systems
A 100-kilometer road sign converts cleanly into kiloparsecs — exactly the conversion drivers planning trips abroad rely on when reading road signs in a different measurement system.
100 km × 3.240779e-17 = 3.240779e-15 kpc
Kilometer to Kiloparsec conversion table
Standard reference values for converting kilometers to kiloparsecs:
| Kilometer [km] | Kiloparsec [kpc] |
|---|---|
| 0.01 | 3.240779e-19 |
| 0.1 | 3.240779e-18 |
| 1 | 3.240779e-17 |
| 2 | 6.481559e-17 |
| 3 | 9.722338e-17 |
| 4 | 1.296312e-16 |
| 5 | 1.62039e-16 |
| 10 | 3.240779e-16 |
| 20 | 6.481559e-16 |
| 30 | 9.722338e-16 |
| 40 | 1.296312e-15 |
| 50 | 1.62039e-15 |
| 100 | 3.240779e-15 |
| 500 | 1.62039e-14 |
| 1000 | 3.240779e-14 |
Frequently asked questions
How many kiloparsecs is 1 kilometer?
How do I convert kilometers to kiloparsecs?
How do I convert kiloparsecs back to kilometers?
How many kiloparsecs is 100 kilometers?
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Atomic / Physics (6 units)
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Sources & references
Conversion factor (1 km = 3.240779e-17 kpc) 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.