Millimeter to Astronomical Unit Conversion Calculator: Free Online Tool
Convert millimeters to astronomical units with our free online length converter.
Millimeter to Astronomical Unit Calculator
How to Use the Calculator:
- Enter the value you want to convert in the 'From' field (Millimeter).
- The converted value in Astronomical Unit will appear automatically in the 'To' field.
- Use the dropdown menus to select different units within the Length category.
- Click the swap button (⇌) to reverse the conversion direction.
How to Convert Millimeter to Astronomical Unit
Converting Millimeter to Astronomical Unit involves multiplying the value by a specific conversion factor, as shown in the formula below.
Formula:
1 Millimeter = 6.6845e-15 astronomical unitsExample Calculation:
Convert 10 millimeters: 10 × 6.6845e-15 = 6.6845e-14 astronomical units
Disclaimer: For Reference Only
These conversion results are provided for informational purposes only. While we strive for accuracy, we make no guarantees regarding the precision of these results, especially for conversions involving extremely large or small numbers which may be subject to the inherent limitations of standard computer floating-point arithmetic.
Not for professional use. Results should be verified before use in any critical application. View our Terms of Service for more information.
What is a Millimeter and a Astronomical Unit?
The millimeter is a unit of length in the metric system equal to one-thousandth of a meter (1/1000 m) or one-tenth of a centimeter (1/10 cm). It is used for very precise measurements.
An astronomical unit is a unit of length roughly equal to the average distance between Earth and the Sun. It is defined as exactly 149,597,870,700 meters.
Note: The Millimeter is part of the metric (SI) system, primarily used globally in science and trade. The Astronomical Unit belongs to the imperial/US customary system.
History of the Millimeter and Astronomical Unit
Defined as a subunit of the meter within the original metric system, the millimeter provides a standard unit for fine measurements required in science, engineering, and manufacturing.
Historically used to measure distances within the Solar System, its value was refined over centuries through astronomical observations. The exact definition was adopted by the IAU in 2012.
Common Uses for millimeters and astronomical units
Explore the typical applications for both Millimeter (metric) and Astronomical Unit (imperial/US) to understand their common contexts.
Common Uses for millimeters
- Engineering & Machining: Precise engineering and machining measurements.
- Technical Design: Technical drawings and specifications.
- Electronics: Measuring small electronic components or wire gauges.
- Meteorology: Measuring rainfall amounts.
- Science: Scientific measurements requiring high precision (e.g., microscopy).
Common Uses for astronomical units
- Measuring distances within the Solar System (e.g., planet orbits)
- Expressing distances to near-Earth objects
Frequently Asked Questions
Questions About Millimeter (mm)
How many millimeters are in a centimeter?
There are 10 millimeters (mm) in 1 centimeter (cm).
How many millimeters are in a meter?
There are 1,000 millimeters (mm) in 1 meter (m).
What does 'milli' mean in millimeter?
The prefix 'milli' denotes one-thousandth (1/1000).
About Astronomical Unit (AU)
Why use Astronomical Units instead of kilometers or miles?
Astronomical Units (AU) provide a more convenient scale for the vast distances within our solar system. Expressing interplanetary distances in km or miles results in extremely large and unwieldy numbers.
How many kilometers/miles is 1 AU?
1 Astronomical Unit (AU) is approximately 149.6 million kilometers or 93 million miles.
How long does it take light to travel 1 AU?
It takes sunlight approximately 8 minutes and 20 seconds to travel the distance of one Astronomical Unit from the Sun to the Earth.
Conversion Table: Millimeter to Astronomical Unit
| Millimeter (mm) | Astronomical Unit (AU) |
|---|---|
| 1 | 0 |
| 5 | 0 |
| 10 | 0 |
| 25 | 0 |
| 50 | 0 |
| 100 | 0 |
| 500 | 0 |
| 1,000 | 0 |