An astronomical unit is the mean Earth-Sun distance.
Astronomical units to Miles Converter — AU to mi
Convert Astronomical unit (AU) to Mile (mi) using the exact conversion factor (1 astronomical unit = 92,955,807.27 mile). See the formula, worked examples, conversion table, unit comparison, history, and common uses.
Astronomical units to Miles converter
Converter
Astronomy Converter
Convert astronomical length, mass, time, and distance units by compatible family.
Context values
Some unit families need one extra value for a physically accurate result.
A statute mile is exactly 1,609.344 meters.
Result = input x 1.49597871e+11 / 1609.344.
Distance units are compatible.
Reserved above the conversion cards and below the converter.
About Converting Astronomical units to Miles
Astronomical unit and Mile both describe astronomical distances at very different scales — one for measuring within our solar system, the other for the distances between stars — and converting between them helps put the scale of space into perspective. Astronomical unit is typically associated with used internationally in astronomy for solar-system-scale distances., while Mile is typically associated with united States.
Formula
miles = astronomical units × 92955807.273
This factor comes from each unit's defined relationship to the category's base unit: 1 astronomical unit equals 149597870700 base units, and 1 mile equals 1609.344 base units, so dividing one by the other gives the direct astronomical unit-to-mile factor of 92955807.273.
Simple example
1 AU × 92955807.27 = 92,955,807.27 mi
1 astronomical unit = 92,955,807.27 miles.
Real-world example
4.24 AU × 92955807.27 = 394,132,622.8 mi
4.24 astronomical units = 394,132,622.8 miles.
Conversion table
| Astronomical unit (AU) | Mile (mi) |
|---|---|
| 1 AU | 92,955,807.27 mi |
| 4.24 AU | 394,132,622.8 mi |
| 10 AU | 929,558,072.7 mi |
| 100 AU | 9,295,580,727 mi |
| 1,000 AU | 92,955,807,270 mi |
| 1,000,000 AU | 9.295581e+13 mi |
Reverse conversion: Mile to Astronomical unit
1 mi × 1.07578e-8 = 1.07578e-8 AU
1 mile = 1.07578e-8 astronomical units.
astronomical units = miles × 1.07578e-8
For a page dedicated to this direction, see Mile to Astronomical unit.
Astronomical unit vs. Mile
| Aspect | Astronomical unit | Mile |
|---|---|---|
| Family | Non-SI unit accepted for use with SI (astronomical) | US/imperial customary unit |
| Typical use | Measuring distances within the solar system (planetary orbits) | Road signage, speed limits, and odometers in the US and UK |
| Where it's used | Used internationally in astronomy for solar-system-scale distances. | United States |
Understanding the Astronomical unit
Astronomical unit (AU) measures distance. The astronomical unit is defined as exactly 149,597,870,700 meters, close to the average Earth-Sun distance. It is classified as a Non-SI unit accepted for use with SI (astronomical).
Where it's used: Used internationally in astronomy for solar-system-scale distances.
Uses of the Astronomical unit today
- Measuring distances within the solar system (planetary orbits)
- Astronomical calculations and spacecraft navigation
- Popular science communication about the solar system
History of the Astronomical unit
The astronomical unit originated from 17th-19th century attempts to measure the Earth-Sun distance, refined over time using transits of Venus and later radar and spacecraft ranging.
In 2012, the International Astronomical Union fixed the AU at exactly 149,597,870,700 meters, replacing its earlier definition (tied to gravitational calculations) with a simple fixed distance, independent of the slightly-variable actual Earth-Sun distance.
Historical origin. Astronomical unit was not the invention of a single named person; it developed through the process described above.
Understanding the Mile
Mile (mi) measures distance. The international statute mile is defined as exactly 1,609.344 meters (5,280 feet). It is classified as a US/imperial customary unit.
Where it's used: United States United Kingdom (road distances and speed limits)
Uses of the Mile today
- Road signage, speed limits, and odometers in the US and UK
- Everyday distance estimates in US/UK contexts
- Aviation and marine contexts use the related but distinct nautical mile instead
History of the Mile
The mile traces back to the Roman 'mille passus' ('a thousand paces'), about 1,000 double-steps of a marching legion, roughly 1,480 meters. The English statute mile diverged from this over the medieval period.
Elizabeth I's government fixed the English statute mile at 5,280 feet in 1593, replacing the old Roman-derived value so it would align evenly with the furlong (660 ft), a unit already standard in English land measurement.
The modern international mile (1,609.344 m exactly) was fixed by the same 1959 International Yard and Pound Agreement that standardized the pound, tying it to the internationally agreed yard of exactly 0.9144 meters.
Historical origin. Mile was not the invention of a single named person; it developed through the process described above.
Astronomical unit — sources
- IAU Resolution B2 (2012) — Fixes the astronomical unit at exactly 149,597,870,700 meters.
Mile — sources
- NIST — International yard and pound (1959) — Fixes the modern mile via the international yard.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many miles are in 1 astronomical unit?
1 astronomical unit equals 92,955,807.27 miles, using the exact defined conversion factor rather than an estimate.
How do I convert astronomical unit to mile?
Multiply the astronomical unit value by 92955807.27. The converter above does this instantly to whatever precision you set.
How do I convert mile back to astronomical unit?
Use the reverse factor: 1 mile equals 1.07578e-8 astronomical units. You can also use the swap control in the converter above to flip the direction instantly.
What is a astronomical unit?
Astronomical unit (AU) measures distance. The astronomical unit is defined as exactly 149,597,870,700 meters, close to the average Earth-Sun distance. It is classified as a Non-SI unit accepted for use with SI (astronomical).
What is a mile?
Mile (mi) measures distance. The international statute mile is defined as exactly 1,609.344 meters (5,280 feet). It is classified as a US/imperial customary unit.
Is the astronomical unit to mile conversion exact?
Yes. The international statute mile is defined as exactly 1,609.344 meters (5,280 feet). That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.
Where is the astronomical unit still used today?
Used internationally in astronomy for solar-system-scale distances.