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Convert Millimeter to Astronomical Unit

1 millimeter = 6.6845871e-15 astronomical units (mm to AU).

The millimeter (mm) and the astronomical unit (AU) both measure length. A millimeter is smaller than a astronomical unit — it takes 149,598,000,000,000 of them to make a single astronomical unit. Going the other way, one astronomical unit is 149,598,000,000,000 millimeters. The converter above does this in real time, and the reference chart lists the values that come up most often.

6.6845871e-15

1 mm = 6.6845871e-15 AU

How to convert Millimeters to Astronomical Units

Multiply the millimeter value by 6.68459e-15 to get astronomical units.

Example: 10 millimeters = 6.68459e-14 astronomical units.

Millimeter to Astronomical Unit Conversion Chart

MillimetersAstronomical Units
1 mm6.6845871e-15 AU
2 mm1.3369174e-14 AU
3 mm2.0053761e-14 AU
5 mm3.3422936e-14 AU
10 mm6.6845871e-14 AU
20 mm1.3369174e-13 AU
25 mm1.6711468e-13 AU
50 mm3.3422936e-13 AU
100 mm6.6845871e-13 AU
1000 mm6.6845871e-12 AU

Frequently Asked Questions

How many astronomical units are in a millimeter?
There are 6.6845871e-15 astronomical units in 1 millimeter.
How do you convert millimeters to astronomical units?
Multiply the millimeter value by 6.68459e-15 to get astronomical units.
What is 5 millimeters in astronomical units?
5 millimeters equals 3.3422936e-14 astronomical units.
What is 100 millimeters in astronomical units?
100 millimeters equals 6.6845871e-13 astronomical units.
What is 1 astronomical unit in millimeters?
1 astronomical unit equals 149,597,870,000,000 millimeters.
Is this millimeter to astronomical unit converter free?
Yes. The converter is free, needs no sign-up, and runs entirely in your browser — the values you enter never leave your device.

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