Convert millimeters to astronomical units
1 mm = 0.00000000000000668458712227 au — exactly. Both units are defined against the SI, so this factor is a fraction, not an approximation.
6.68458712227e-15au
As a fraction: 1/149597870700000
1 mm = 0.00000000000000668458712227 au
How to convert millimeters to astronomical units
Multiply the number of millimeters by 0.00000000000000668458712227 to get astronomical units.
Astronomical unit: Fixed at exactly 149 597 870 700 m by the IAU in 2012.
Millimeter to Astronomical unit conversion table
| Millimeters (mm) | Astronomical units (au) |
|---|---|
| 1 mm | 6.6845871e-15 |
| 2 mm | 1.3369174e-14 |
| 3 mm | 2.0053761e-14 |
| 5 mm | 3.3422936e-14 |
| 10 mm | 6.6845871e-14 |
| 20 mm | 1.3369174e-13 |
| 25 mm | 1.6711468e-13 |
| 50 mm | 3.3422936e-13 |
| 100 mm | 6.6845871e-13 |
| 250 mm | 1.6711468e-12 |
| 500 mm | 3.3422936e-12 |
| 1000 mm | 6.6845871e-12 |
Astronomical unit to Millimeter conversion table
| Astronomical units (au) | Millimeters (mm) |
|---|---|
| 1 au | 149 597 870 000 000 |
| 2 au | 299 195 740 000 000 |
| 3 au | 448 793 610 000 000 |
| 5 au | 747 989 350 000 000 |
| 10 au | 1 495 978 700 000 000 |
| 20 au | 2 991 957 400 000 000 |
| 25 au | 3 739 946 800 000 000 |
| 50 au | 7 479 893 500 000 000 |
| 100 au | 1.4959787e+16 |
| 250 au | 3.7399468e+16 |
| 500 au | 7.4798935e+16 |
| 1000 au | 1.4959787e+17 |
Frequently asked
How many astronomical units are in a millimeter?
One millimeter equals 6.684587122e-15 astronomical units (mm → au). That figure is exact, not rounded.
How do you convert millimeters to astronomical units?
Multiply the number of millimeters by 0.00000000000000668458712227 to get astronomical units.
What is 1 au in millimeters?
One astronomical unit is 149597870700000 millimeters.
What is 10 mm in au?
10 mm = 6.6845871e-14 au.
What exactly is a astronomical unit?
Fixed at exactly 149 597 870 700 m by the IAU in 2012.