How old would you be elsewhere?
Enter your birthday. See your age on every planet, plus the Earth-date of your next birthday on each one.
How this works
Your age on another planet is simply your age in Earth days divided by the length of that planet's year (its orbital period).
A year is just the time it takes a planet to travel once around the Sun. On Mercury that takes about 88 Earth days. On Jupiter, almost 12 Earth years. On Neptune, almost 165 Earth years. So if you were born 30 Earth years ago, you've lived through roughly 125 Mercury years — but only 0.18 of a Neptune year.
Orbital periods used
- Mercury — 0.241 Earth years (88 days)
- Venus — 0.615 Earth years (225 days)
- Earth — 1 year (365.25 days)
- Mars — 1.881 Earth years (687 days)
- Jupiter — 11.86 Earth years
- Saturn — 29.45 Earth years
- Uranus — 84.02 Earth years
- Neptune — 164.79 Earth years
- Pluto — 247.94 Earth years
Is your data saved?
All calculation happens in your browser. Your birthday never leaves your device. We save the date in your browser's local storage so the other tools on this site can use it without asking twice — clear it any time from your browser settings.
Related tools
- Cosmic Birthday — every upcoming planetary birthday on your calendar.
- Life in Weeks — the weeks of your life, as a grid.
- Time Dust — years quietly spent on small things.