Age on other planets

Your age in Mercury, Mars, or Saturn years — and when the next birthday lands there.

Your age on Mercury, Mars, Jupiter… — Earth days alive divided by each world's year length, plus your next planet birthday.

Mean orbital periods; ignores leap-year details beyond whole Earth days. Runs in this browser.

How to use

  1. Enter your birth date.
  2. Pick a planet.
  3. Read your planetary age and next birthday.

What it supports

Year lengths in Earth days (Mercury 87.97, Mars 686.98, Jupiter 4,332.59, Saturn 10,759.22…) — birthdays count each completed planet-year from birth. Orbital eccentricity is ignored.

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