Planet Age Calculator
Calculate your age on Mercury, Venus, Mars, Jupiter and other planets from your birthday. Free online space age calculator with your next planet birthdays.
What next?
Found it useful? Share Planet Age Calculator
Free, no sign-up, works in the browser — send it to a friend or add it to your site.
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Part of the toolkit
How to use Planet Age Calculator
- 1Enter your birth date.
- 2See your age on every planet from Mercury to Pluto.
- 3Check the progress bars and dates of your next planet birthdays.
- 4Copy or share your space age card.
Frequently asked questions
How is my age on another planet calculated?▾
Your age in Earth days is divided by how many Earth days that planet takes to orbit the Sun.
Why am I so old on Mercury?▾
Mercury orbits the Sun in just 88 days, so you have a Mercury birthday about every three months.
When is my next birthday on Mars?▾
The tool shows the exact date. A Mars year is 687 Earth days, so it comes about every 1.9 years.
Is Pluto included?▾
Yes, as a dwarf planet. Its year is 248 Earth years, so nobody alive has turned 1 on Pluto.
Is my birthday saved or shared?▾
No. It is calculated in your browser, and a shared link only includes your age in whole years.
Embed Planet Age Calculator on your website▾
Paste this snippet into your page. The embedded tool runs in your visitor's browser and shows a small “Powered by clkr.work” link.