How many millimeters are in 1 AU?

One AU contains approximately 1.496 x 1014 millimeters (about 150 trillion mm). Since 1 AU = 149,597,870,700 m and 1 m = 1,000 mm, multiply.

How do I convert AU to millimeters?

Multiply the AU value by 1.496 x 1014. For practical purposes, this conversion is never needed. AU is for astronomy, mm is for engineering.

Is this conversion ever practical?

No. Millimeters are for machining tolerances and technical drawings. AU is for planetary orbits. They serve completely different purposes at completely different scales.

Astronomical Units to Millimeters (au to mm) Converter

1 au = 149,598,000,000,000 mm

1 Astronomical Unit equals 149,598,000,000,000 Millimeters (1 au = 149,598,000,000,000 mm). Convert Astronomical Units to Millimeters with formula, table, and examples.

One astronomical unit equals approximately 1.496 x 10¹⁴ millimeters, or about 150 trillion millimeters. This conversion expresses the Earth-Sun distance in the precision engineering unit used for manufacturing tolerances, screw threads, and technical specifications.

How to Convert Astronomical Units to Millimeters

mm = au × 149,598,000,000,000

Multiply the value in Astronomical Units by 149,598,000,000,000

Take your value in Astronomical Units
Multiply by 149,598,000,000,000
Read the result in Millimeters

Common Astronomical Units to Millimeters Conversions

Astronomical Units (au)	Millimeters (mm)	Status
1 × 10⁻¹³ au	14.9598 mm
1 × 10⁻¹² au	149.5979 mm
1 × 10⁻¹¹ au	1,495.9787 mm
1 × 10⁻¹⁰ au	14,959.7871 mm
1 × 10⁻⁹ au	149,597.8707 mm
1 × 10⁻⁸ au	1,495,978.707 mm
1 × 10⁻⁷ au	14,959,787.07 mm
0.000001 au	149,597,870.7 mm
0.00001 au	1,495,978,707 mm
0.0001 au	14,959,787,070 mm
0.001 au	149,597,870,700 mm

Good to Know About Astronomical Units to Millimeters Conversion

Engineering drawings specify parts in millimeters. Orbital mechanics specifies trajectories in AU. Both are precision disciplines, but their measurement scales differ by 14 orders of magnitude.

Astronomical Units to Millimeters: What You Need to Know

The Earth-Sun distance in millimeters is about 149,597,870,700,000 mm. A 10mm wrench is 6.7 x 10^-14 AU long. While no engineer needs planetary distances in millimeters, the conversion illustrates the enormous gap between human-scale precision (millimeters) and astronomical distances (AU).

What is a Astronomical Unit? au

Exactly 149,597,870,700 meters by IAU 2012 definition. Roughly the average distance from the Earth to the Sun. Used for distances within our solar system.

Astronomical solar system distances astronomy planetary science

Learn more about Astronomical Unit →

What is a Millimeter? mm

A metric unit of length equal to one thousandth of a meter. Used in engineering, manufacturing, and precise measurements.

Metric engineering manufacturing rainfall

Learn more about Millimeter →

Going the other way? Use our Millimeters to Astronomical Units converter.

Astronomical Units to Millimeters FAQ

One AU contains approximately 1.496 x 10¹⁴ millimeters (about 150 trillion mm). Since 1 AU = 149,597,870,700 m and 1 m = 1,000 mm, multiply.
Multiply the AU value by 1.496 x 10¹⁴. For practical purposes, this conversion is never needed. AU is for astronomy, mm is for engineering.
No. Millimeters are for machining tolerances and technical drawings. AU is for planetary orbits. They serve completely different purposes at completely different scales.

Non-Frequently Asked Questions About Astronomical Units to Millimeters

Questions nobody should ask - but someone did.

If 1 AU = 1 meter (1,000 mm), Earth orbits at 1 m from a pinhead Sun. Jupiter would be at 5.2 m (across the room). Neptune at 30 m (down the street). The actual solar system in millimeters would be 149.6 trillion mm across for just Earth's orbit.