Convert Sun's Radius to Kiloparsec
Convert sun's radii to kiloparsecs instantly. 1 sun's radius = 2.25461e-11 kiloparsec — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Kiloparsec to Sun's Radius converter for the reverse conversion.
Units explained
Sun's Radius
The Sun's radius is approximately 695,700 km (6.957×10⁸ m), defined as the IAU 2015 nominal solar radius for use in stellar physics and exoplanet research.
The IAU (International Astronomical Union) Resolution B3 in 2015 defined a nominal solar radius of exactly 6.957×10⁸ m to serve as a stable reference, independent of actual measurement-uncertainty variations in the real Sun.
Solar radii are used in stellar physics, exoplanet characterisation, and any context where a star's size is expressed relative to the Sun. Most stellar radius measurements are quoted in solar-radius units rather than meters.
Defined exactly at 6.957×10⁸ m by IAU Resolution B3 in 2015.
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.
Sun's Radius to Kiloparsec conversion formula
The relationship between sun's radii and kiloparsecs:
To convert sun's radii to kiloparsecs, multiply the value in sun's radii by 2.25461e-11. To reverse, multiply kiloparsecs by 4.435357e+10.
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 Sun's Radius converter for the reverse direction.
Step-by-step: convert sun's radii to kiloparsecs
- Write down the value in sun's radii (R☉).
- Multiply that value by the factor 2.25461e-11.
- The product is the equivalent value in kiloparsecs (kpc).
- To reverse, multiply the kiloparsec value by 4.435357e+10.
Worked examples
Example 1 — Convert 1 R☉ to kpc:
1 × 2.25461e-11 = 2.25461e-11 kpc
Example 2 — Convert 100 R☉ to kpc:
100 × 2.25461e-11 = 2.25461e-9 kpc
Sun's Radius to Kiloparsec conversion table
Standard reference values for converting sun's radii to kiloparsecs:
| Sun's Radius [R☉] | Kiloparsec [kpc] |
|---|---|
| 0.01 | 2.25461e-13 |
| 0.1 | 2.25461e-12 |
| 1 | 2.25461e-11 |
| 2 | 4.50922e-11 |
| 3 | 6.76383e-11 |
| 4 | 9.018441e-11 |
| 5 | 1.127305e-10 |
| 10 | 2.25461e-10 |
| 20 | 4.50922e-10 |
| 30 | 6.76383e-10 |
| 40 | 9.018441e-10 |
| 50 | 1.127305e-9 |
| 100 | 2.25461e-9 |
| 500 | 1.127305e-8 |
| 1000 | 2.25461e-8 |
Frequently asked questions
How many kiloparsecs is 1 sun's radius?
How do I convert sun's radii to kiloparsecs?
How do I convert kiloparsecs back to sun's radii?
How many kiloparsecs is 100 sun's radii?
Popular length unit conversions
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Metric / SI (4 units)
Imperial / US Customary (4 units)
Astronomical (8 units)
Sources & references
Conversion factor (1 R☉ = 2.25461e-11 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.