Astronomical Unit to Millimeter Converter
Convert Astronomical Unit (AU) to Millimeter (mm) instantly. 1 AU = 1.495979e+14 mm.
Length Converter
31 units available
1 AU = 1.495979e+14 mm
Formula:
mm = AU × 1.495979e+14With your value: 1 AU = 1.495979e+14 mm
How big is that?
Everyday references on a logarithmic scale, all expressed in astronomical unit so you can sanity-check the result.
Other Astronomical Unit to Millimeter conversions
Astronomical Unit to Millimeter Conversion Table
| Astronomical Unit (AU) | Millimeter (mm) |
|---|---|
| 0.5 | 7.479894e+13 |
| 1 | 1.495979e+14 |
| 2 | 2.991957e+14 |
| 5 | 7.479894e+14 |
| 10 | 1.495979e+15 |
| 15 | 2.243968e+15 |
| 20 | 2.991957e+15 |
| 25 | 3.739947e+15 |
| 50 | 7.479894e+15 |
| 100 | 1.495979e+16 |
| 250 | 3.739947e+16 |
| 500 | 7.479894e+16 |
| 1000 | 1.495979e+17 |
Millimeter to Astronomical Unit Conversion Table
| Millimeter (mm) | Astronomical Unit (AU) |
|---|---|
| 0.5 | 3.342294e-15 |
| 1 | 6.684587e-15 |
| 2 | 1.336917e-14 |
| 5 | 3.342294e-14 |
| 10 | 6.684587e-14 |
| 15 | 1.002688e-13 |
| 20 | 1.336917e-13 |
| 25 | 1.671147e-13 |
| 50 | 3.342294e-13 |
| 100 | 6.684587e-13 |
| 250 | 1.671147e-12 |
| 500 | 3.342294e-12 |
| 1000 | 6.684587e-12 |
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.
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
Millimeter (mm)
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
How to Convert Astronomical Unit to Millimeter
To convert from Astronomical Unit (AU) to Millimeter (mm), multiply the value by 1.495979e+14.
Formula: mm = AU × 1.495979e+14
Reverse: AU = mm × 6.684587e-15
Step-by-Step Example
- Start with your value in Astronomical Unit. For example: 5 AU
- Multiply by the conversion factor: 5 x 1.495979e+14
- The result is: 7.479894e+14 mm
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: planetary science, orbital mechanics, astronomy.
About Millimeter
The millimeter equals one thousandth of a meter and is used for precise measurements in engineering and manufacturing.
Common uses: engineering, rainfall measurement, manufacturing.
Frequently Asked Questions
How many Millimeter are in 1 Astronomical Unit?
There are exactly 1.495979e+14 Millimeter in 1 Astronomical Unit. This means the conversion factor from Astronomical Unit to Millimeter is 1.495979e+14.
What is the formula to convert Astronomical Unit to Millimeter?
The formula to convert Astronomical Unit to Millimeter is: mm = AU × 1.495979e+14. For example, to convert 10 Astronomical Unit to Millimeter, you would multiply 10 by 1.495979e+14.
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 is a Millimeter?
The millimeter equals one thousandth of a meter and is used for precise measurements in engineering and manufacturing.
What are the common uses of Astronomical Unit?
The Astronomical Unit is commonly used in planetary science, orbital mechanics, astronomy.
Related Length Conversions
Cite this page
UnitConvertLab. (2026). Astronomical Unit to Millimeter converter. UnitConvertLab. Retrieved from https://unitconvertlab.com/convert/astronomical_unit-to-millimeter