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The question is self-explanatory: How much do the astromech droids R2-D2 and BB-8 weigh, in-universe?

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  • I was thinking of this myself rewatching ESB. Threepio and Artoo fall from a short height from a hovercraft into the sand, yet manage to get almost completely buried. That's some impact! – user31178 Jan 1 '16 at 4:35
  • @CreationEdge that was in RotJ :) – RedCaio Jan 1 '16 at 5:52
  • @RedCaio Geez, and I almost typed Ep XI instead. I don't know why I mixed up the titles, I hadn't even started drinking yet! – user31178 Jan 1 '16 at 5:53
  • @CreationEdge - as we see in Ep7, there is quicksand on sand planets in TGFFA. Could have possibly been that? (ok, ok, I know it was Lucas doing his Kurosawa thing. But I'm allowed to my own fan theories, ain't i?) – DVK-on-Ahch-To Jan 1 '16 at 6:11
  • @DVK I think comedy relief gets a free pass. Comedy is the power that bends the universe to its will. – user31178 Jan 1 '16 at 6:13
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R2-D2:

  • Wookieepedia says (citing "Star Wars Rebels: Head to Head") 32 kg.

  • Apparently the same number was in EU/Legends, in "Star Wars: Head-to-Head Tag Teams, pg 50" as per the same page.

BB-8

  • couldn't find in-universe evidence in the film, novelization, or Visual Dictionary page.

  • Sphero's out of universe popular toy is ~200 g (at the height of 11cm, compared to real one's Databank height of 0.67m). If we proportionally size the weight up by 6^3=216 times, we get ~42kg.

    Which probably isn't accurate, since I assume TGFFA has much better/lighter materials than Sphero (since R2-D2 could fly and BB-8 has liquid metal cables that hold its weight and pull him up).

  • Doing very back of the envelope guessing it looks like his body is ~20-30% of R2-D2 by volume. (they fit in same size X-Wing astromech socket.

    • R2-D2's body seems to be exactly 1.5 times BB-8 body, since his body+head fits exactly 2 BB-8 bodies and his head is an exact hemisphere of the same radius. That gives us 9.42+4.19/2=11.5 for R2-D2 volume given radius of 1 (for simplicity of comparison), excluding appendages. BB-8 is 4.19 for the body and roughly 0.26 for head (half a sphere size of half the body), totalling 4.45.

    Assuming he's not made of some advanced ultralight composites that severely affected his density by comparison the above gives us ~12.4kg. It may be less because of more advanced materials, or because I didn't count the volume of R2-D2's legs; or it can be less because I assume a spherical droid's internal space has less empty lacunae due to better space packing. Without better canon info, I'll call those factors a wash for hand-waved calculation purposes and settle on 12kg.

    enter image description here

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  • Finn needs to hit the gym if he struggles with 12kgs – CandiedMango Jan 1 '16 at 6:00
  • @CandiedMango - huh? when was he carrying BB-8? I know it FELL on him... but I wouldn't be happy if 12kg fell on me either :) – DVK-on-Ahch-To Jan 1 '16 at 6:03
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    Before it falls on him he attempts to lift BB-8 down into the hold. He makes a sort of struggling gasp and falls over being crushed by BB-8. 12kgs is really not a lot at all specially for a storm trooper who has probably had some form of fitness training :P – CandiedMango Jan 1 '16 at 6:05
  • @CandiedMango - I must have mis-seen it. I was under firm impression that Rey dropped BB-8 on him from above. Can't wait for DVD! – DVK-on-Ahch-To Jan 1 '16 at 6:09
  • Hmm I seem to remember him rolling off the edge into an expecting finn. Knowing modern times we'll only have to wait a few months! – CandiedMango Jan 1 '16 at 6:10

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