28 Kilometer to Astronomical Unit
Quick answer
28 Kilometer (km) equals
1.871684e-7 AU
To convert 28 Kilometers to Astronomical Units, multiply by 6.684587e-9. Therefore, 28 Kilometer (km) equals 1.871684e-7 Astronomical Unit (AU).
Formula: AU = km × 6.684587e-9. Calculation: 28 × 6.684587e-9 = 1.871684e-7 AU.
Convert Kilometer (km) to Astronomical Unit (AU) online with our free unit converter. In length, 1 km = 6.684587e-9 AU. Explore step-by-step conversion steps, mathematical formulas, and quick conversion reference tables below.
Worked example: converting Kilometer to Astronomical Unit
- Step 1 — start with the formula. AU = km × 6.684587e-9
- Step 2 — substitute your figure. 28 km × 6.684587e-9
- Step 3 — read the result. 28 km = 1.871684e-7 AU
- Step 4 — check it in reverse. km = AU × 149,597,870.7 returns 28 km, which matches the figure you started with.
Length Converter
31 units available
28 km = 1.871684e-7 AU
Formula:
AU = km × 6.684587e-9With your value: 28 km = 1.871684e-7 AU
How big is that?
Everyday references on a logarithmic scale, all expressed in kilometer so you can sanity-check the result.
Other Kilometer to Astronomical Unit conversions
Kilometer to Astronomical Unit Conversion Table
| Kilometer (km) | Astronomical Unit (AU) |
|---|---|
| 0.5 | 3.342294e-9 |
| 1 | 6.684587e-9 |
| 2 | 1.336917e-8 |
| 5 | 3.342294e-8 |
| 10 | 6.684587e-8 |
| 15 | 1.002688e-7 |
| 20 | 1.336917e-7 |
| 25 | 1.671147e-7 |
| 50 | 3.342294e-7 |
| 100 | 6.684587e-7 |
| 250 | 1.671147e-6 |
| 500 | 3.342294e-6 |
| 1000 | 6.684587e-6 |
Astronomical Unit to Kilometer Conversion Table
| Astronomical Unit (AU) | Kilometer (km) |
|---|---|
| 0.5 | 74,798,935.35 |
| 1 | 149,597,870.7 |
| 2 | 299,195,741.4 |
| 5 | 747,989,353.5 |
| 10 | 1,495,978,707 |
| 15 | 2,243,968,060.5 |
| 20 | 2,991,957,414 |
| 25 | 3,739,946,767.5 |
| 50 | 7,479,893,535 |
| 100 | 14,959,787,070 |
| 250 | 37,399,467,675 |
| 500 | 74,798,935,350 |
| 1000 | 149,597,870,700 |
Where these values come from
Every factor on this page is traced to the document that defines it. See the full provenance dataset or our methodology.
Kilometer (km)
Length
Traceable to the metre, defined by fixing the speed of light in vacuum at 299 792 458 m/s. Imperial lengths derive from the 1959 international yard (0.9144 m exactly).
Source: BIPM, The International System of Units (SI), 9th edition, 2019 (updated 2024)
Bureau International des Poids et Mesures · Reviewed 2026-07-01
Astronomical Unit (AU)
Length
The astronomical unit is exactly 149 597 870 700 m (IAU Resolution B2, 2012).
Source: IAU Resolution B2 (2012) — definition of the astronomical unit; IAU B2 (2015) nominal values
International Astronomical Union · Reviewed 2026-07-01
How to Convert Kilometer to Astronomical Unit
To convert from Kilometer (km) to Astronomical Unit (AU), multiply the value by 6.684587e-9.
Formula: AU = km × 6.684587e-9
Reverse: km = AU × 149,597,870.7
Step-by-Step Example
- Start with your value in Kilometer. For example: 5 km
- Multiply by the conversion factor: 5 x 6.684587e-9
- The result is: 3.342294e-8 AU
Kilometer and Astronomical Unit Relationship
This conversion bridges the Metric (SI) and Astronomical measurement systems, commonly required when translating scientific data, international engineering specifications, or trade standards. Since 1 Kilometer represents a fraction of a Astronomical Unit (1 Astronomical Unit ≈ 1.496e+8 Kilometers), the Astronomical Unit is the larger measurement interval. Understanding the relationship between Kilometer and Astronomical Unit is essential for accurate calculations in physics, engineering, commerce, and daily applications.
About Kilometer
The kilometer equals 1,000 meters and is the standard unit for measuring distances between geographical locations in most countries.
Fun Fact: The circumference of Earth is approximately 40,075 km.
Common uses of Kilometer: road distances, geography, running.
About Astronomical Unit
The astronomical unit (AU) is defined as exactly 149,597,870,700 metres, close to the mean Earth–Sun distance. It is the natural yardstick for the Solar System.
Common uses of Astronomical Unit: planetary science, orbital mechanics, astronomy.
Frequently Asked Questions
- What is 28 Kilometer in Astronomical Unit?
- 28 Kilometer equals 1.871684e-7 Astronomical Unit.
- How many Astronomical Units are in 1 Kilometer?
- There are exactly 6.684587e-9 Astronomical Units in 1 Kilometer. This means the conversion factor from Kilometer to Astronomical Unit is 6.684587e-9.
- What is the formula to convert Kilometer to Astronomical Unit?
- The formula to convert Kilometer to Astronomical Unit is: AU = km × 6.684587e-9. For example, to convert 10 Kilometers to Astronomical Units, you would multiply 10 by 6.684587e-9.
- What is a Kilometer?
- The kilometer equals 1,000 meters and is the standard unit for measuring distances between geographical locations in most countries.
- What is a Astronomical Unit?
- The astronomical unit (AU) is defined as exactly 149,597,870,700 metres, close to the mean Earth–Sun distance. It is the natural yardstick for the Solar System.
- What are the common uses of Kilometer?
- The Kilometer is commonly used in road distances, geography, running.
Related Length Conversions
Cite this page
UnitConvertLab. (2026). 28 Kilometer to Astronomical Unit. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/28-kilometer-to-astronomical_unit