How many micrometers are in 1 AU?

One AU contains approximately 1.496 x 1017 um (about 150 quadrillion).

Is this conversion practical?

No. Cells and planetary orbits exist at scales separated by 17 orders of magnitude with no practical overlap.

Micrometers to Astronomical Units (μm to au) Converter

Q: How many AU is 1 micrometer?

One micrometer equals approximately 6.685 x 10-18 AU.

1 μm = 6.68459 × 10⁻¹⁸ au

1 Micrometer equals 6.68459 × 10⁻¹⁸ Astronomical Units (1 μm = 6.68459 × 10⁻¹⁸ au). Convert Micrometers to Astronomical Units with formula, table, and examples.

One micrometer equals approximately 6.685 x 10^-18 astronomical units. The AU (149.6 billion meters) measures planetary distances; the micrometer measures cells and precision tolerances. About 17 orders of magnitude separate them.

How to Convert Micrometers to Astronomical Units

au = μm ÷ 1.49598 × 10¹⁷

Divide the value in Micrometers by 1.49598 × 10¹⁷

Take your value in Micrometers
Divide by 1.49598 × 10¹⁷
Read the result in Astronomical Units

Common Micrometers to Astronomical Units Conversions

Micrometers (μm)	Astronomical Units (au)	Status
1 μm	6.68 × 10⁻¹⁸ au
100 μm	6.6845 × 10⁻¹⁶ au
10,000 μm	6.68459 × 10⁻¹⁴ au
1,000,000 μm	6.68459 × 10⁻¹² au
100,000,000 μm	6.68459 × 10⁻¹⁰ au
10,000,000,000 μm	6.68459 × 10⁻⁸ au
1,000,000,000,000 μm	0.000007 au
100,000,000,000,000 μm	0.0007 au
1 × 10¹⁶ μm	0.0668 au

Good to Know About Micrometers to Astronomical Units Conversion

The micrometer measures the machinery of life. The AU measures the arrangement of planets. Both units describe systems that operate mechanically: cells divide on schedules, planets orbit on schedules. The scales differ by 10¹⁷ but the principle of regular motion is the same.

Micrometers to Astronomical Units: What You Need to Know

The Earth-Sun distance is about 1.496 x 10¹⁷ micrometers. A red blood cell at 7 um is 4.68 x 10^-17 AU across. These units occupy completely separate measurement domains.

What is a Micrometer? μm

One millionth of a meter, also called a micron. Used in biology for cell sizes, in engineering for surface finishes, and in manufacturing tolerances.

Metric biology manufacturing engineering tolerances

Learn more about Micrometer →

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 →

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

Micrometers to Astronomical Units FAQ

One micrometer equals approximately 6.685 x 10^-18 AU.
One AU contains approximately 1.496 x 10¹⁷ um (about 150 quadrillion).
No. Cells and planetary orbits exist at scales separated by 17 orders of magnitude with no practical overlap.

Non-Frequently Asked Questions About Micrometers to Astronomical Units

Questions nobody should ask - but someone did.

A bacterium is about 2 um. The Earth-Sun distance is 1.496 x 10¹⁷ um. That is about 75 quadrillion bacteria in a line. Earth has about 10³⁰ bacteria total - enough to span this distance about 13 million times over. There are far more bacteria than space to put them.
A red blood cell is 7 um. 1 AU = 1.496 x 10¹⁷ um. That is about 21.4 quadrillion cells. Your body has about 25 trillion red blood cells - enough to span only 0.12% of the Earth-Sun distance. You are small.
1.496 x 10¹⁷ seconds = about 4.74 billion years. The Sun has about 5 billion years of fuel left. The dust mite would arrive just as the Sun starts to die. Terrible timing.