I wonder if there are any calculations that estimate the percentage of star systems with planets that potentially can support life?

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    $\begingroup$ Relevant? The Drake equation $\endgroup$ – Dan Pichelman Oct 12 '17 at 16:57
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    $\begingroup$ Have you done research on the Drake equation? I know it goes all the way out to communicating civilizations, but potentially life-supporting planets are part of the calculation. There is no brief answer to this question, as we are still relatively new at the game of finding planets. $\endgroup$ – called2voyage Oct 12 '17 at 16:57
  • $\begingroup$ As a point of reference, check out how many potentially habitable planets there could be just within 100 light-years of us: space.stackexchange.com/questions/4062/… $\endgroup$ – called2voyage Oct 12 '17 at 16:59
  • $\begingroup$ Didn't Carl Sagan do something or present something on this?.. Yup, found this : mentalfloss.com/article/27835/… $\endgroup$ – Solar Mike Oct 12 '17 at 17:19
  • $\begingroup$ @Dan Pichelman, I didn't know about it, thanks. $\endgroup$ – Asterea Oct 12 '17 at 20:40

We don't have a good estimate of this yet. Our ability to detect planets around other stars is very limited, and biased toward finding very large planets in very close orbits around stars.

Drake's original estimate was that a star with planets would average between one and 5 planets capable of developing life, so the percentage would be quite high. Other estimates range as low as ~40%.

  • $\begingroup$ And we don't know anything about the atmospheres of those planets, so their habitability isn't even a scientific question at the moment. $\endgroup$ – AtmosphericPrisonEscape Oct 13 '17 at 11:09

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