Age on Other Planets Calculator
See how old you would be on Mercury, Venus, Mars and the outer planets.
Last updated · View algorithm, constants and default inputs (JSON)
About this calculator
Your age elsewhere is just your Earth age divided by that planet's orbital period, because an orbit is that planet's year. Since Mercury circles the Sun every 88 days, every Earth year adds more than four Mercurian birthdays, while a single Neptune year lasts nearly 165 Earth years.
Worked example
calculated with the default values below
Your age on Earth 30 years Age on Mercury 124.56 years · Age on Venus 48.76 years · Age on Mars 15.95 years · Age on Jupiter 2.53 years · Age on Saturn 1.02 years · Age on Uranus 0.36 years · Age on Neptune 0.18 years · Days lived 10,957 days
General background references
Disclaimer
These calculators give general estimates. Sizing, pricing, availability and standards vary by brand, retailer and country, so treat the output as a starting point and confirm it against the seller's or authority's own figures.
Implementation source
This record describes the implementation used by this page. It is not independent validation. External references, when available, support only the stated formula or definition; estimates and custom rules retain their own assumptions.
Formula and variables
age_p = age_e ÷ P_p
- age_p
- age on that planet
- age_e
- age on Earth (years)
- P_p
- orbital period in Earth years
Periods: Mercury 0.2408, Venus 0.6152, Mars 1.8808, Jupiter 11.863, Saturn 29.447, Uranus 84.017, Neptune 164.791.
Frequently asked questions
Why is a Neptune year treated as 164.79 Earth years here?
Each planet's age is your Earth age divided by that planet's orbital period, and Neptune's sidereal orbit is 164.79 Earth years, so a 30-year-old becomes about 0.18 Neptune years. The figure is purely orbital, ignoring each planet's rotation and any calendar convention. Mercury at 0.24 years gives over four birthdays per Earth year, the opposite extreme.