Astronomical units to orbital period in years
Type a value in AU to get it in yr instantly.
1yr
That's about the same as Earth. A year out there lasts about 1 Earth years.
Convert the other way: yr to AU
What it means
How long is its year?
Kepler’s law here assumes the Sun’s mass and a circular orbit. Real orbits are ellipses, and the semi-major axis is what goes into the formula.
The math
How to convert AU to yr
Kepler’s third law: period in years = (distance in AU)^1.5, and back again distance = period^(2/3). Orbital speed falls as 29.78 ÷ √distance km/s.
Example: 1 AU = 1 yr.
Every unit
Your orbit in every unit
Tables
AU to yr conversion table
| AU | yr |
|---|---|
| 0.39 AU | 0.243555 yr |
| 0.72 AU | 0.61094 yr |
| 1 AU | 1 yr |
| 1.52 AU | 1.87398 yr |
| 2.8 AU | 4.6853 yr |
| 5.2 AU | 11.8578 yr |
| 9.5 AU | 29.281 yr |
| 19.2 AU | 84.1302 yr |
| 30.1 AU | 165.139 yr |
| 39.5 AU | 248.254 yr |
| 100 AU | 1,000 yr |
yr to AU conversion table
| yr | AU |
|---|---|
| 0.39 yr | 0.533797 AU |
| 0.72 yr | 0.80332 AU |
| 1 yr | 1 AU |
| 1.52 yr | 1.32199 AU |
| 2.8 yr | 1.98658 AU |
| 5.2 yr | 3.00148 AU |
| 9.5 yr | 4.48555 AU |
| 19.2 yr | 7.17025 AU |
| 30.1 yr | 9.67634 AU |
| 39.5 yr | 11.5984 AU |
| 100 yr | 21.5443 AU |
Quick answers
Quick answers
- How many yr is 1 AU?
- 1 AU is 1 yr.
- How many yr is 10 AU?
- 10 AU is 31.6228 yr.
The units
About these units
Astronomical units (AU)
The Earth–Sun distance, the natural ruler for the solar system.
Orbital period in years (yr)
How long one trip around the Sun takes.
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