Convert Sun's Radius to Megaparsec
Convert sun's radii to megaparsecs instantly. 1 sun's radius = 2.25461e-14 megaparsec — use the live calculator, the exact formula, a conversion table and worked examples. Also check the Megaparsec 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.
Megaparsec
A megaparsec is a distance unit equal to one million parsecs (about 3.09×10²² m). It is the standard unit for cosmological-scale distances.
Combines the metric-style prefix mega- with the parsec. Standardised in astronomy for inter-galactic distances and cosmological calculations.
Megaparsecs are used in cosmology to express distances to other galaxies (Andromeda is ~0.78 Mpc), galaxy-cluster separations, and the Hubble constant (typically quoted as ~70 km/s per Mpc).
Exact via the parsec; the megaparsec is the standard scale unit in modern cosmology.
Sun's Radius to Megaparsec conversion formula
The relationship between sun's radii and megaparsecs:
To convert sun's radii to megaparsecs, multiply the value in sun's radii by 2.25461e-14. To reverse, multiply megaparsecs by 4.435357e+13.
How to use this converter
Type a value into the calculator. The result in megaparsecs updates as you type. Tap a quick value, copy the result with one click, or use the swap arrow to jump straight to the Megaparsec to Sun's Radius converter for the reverse direction.
Step-by-step: convert sun's radii to megaparsecs
- Write down the value in sun's radii (R☉).
- Multiply that value by the factor 2.25461e-14.
- The product is the equivalent value in megaparsecs (Mpc).
- To reverse, multiply the megaparsec value by 4.435357e+13.
Worked examples
Example 1 — Convert 1 R☉ to Mpc:
1 × 2.25461e-14 = 2.25461e-14 Mpc
Example 2 — Convert 100 R☉ to Mpc:
100 × 2.25461e-14 = 2.25461e-12 Mpc
Sun's Radius to Megaparsec conversion table
Standard reference values for converting sun's radii to megaparsecs:
| Sun's Radius [R☉] | Megaparsec [Mpc] |
|---|---|
| 0.01 | 2.25461e-16 |
| 0.1 | 2.25461e-15 |
| 1 | 2.25461e-14 |
| 2 | 4.50922e-14 |
| 3 | 6.76383e-14 |
| 4 | 9.018441e-14 |
| 5 | 1.127305e-13 |
| 10 | 2.25461e-13 |
| 20 | 4.50922e-13 |
| 30 | 6.76383e-13 |
| 40 | 9.018441e-13 |
| 50 | 1.127305e-12 |
| 100 | 2.25461e-12 |
| 500 | 1.127305e-11 |
| 1000 | 2.25461e-11 |
Frequently asked questions
How many megaparsecs is 1 sun's radius?
How do I convert sun's radii to megaparsecs?
How do I convert megaparsecs back to sun's radii?
How many megaparsecs is 100 sun's radii?
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Imperial / US Customary (4 units)
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Sources & references
Conversion factor (1 R☉ = 2.25461e-14 Mpc) 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.