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In Big Bang Theory, Sheldon occasionally brags about his IQ which is very high (187), and his best friend Leonard has a whooping 173. Its clear Sheldon does not think Howard to be smart enough because he is mere engineer

However what is the IQ of Raj, because he is only one who gets the chance to work with Sheldon.

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As far as I know, this has never been revealed either on the show or in any sort of interview with show runners/writers. –  jlmcdonald Oct 25 '12 at 21:11
Raj never worked with Sheldon. He worked FOR Sheldon. –  MyCodeSucks Oct 21 '13 at 17:20

4 Answers 4

No IQ scores for either Raj or Howard have been stated.

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+1: We know Sheldon's is 187 and Leonard's is 173 - but Raj or Howard's are unknown. –  Andrew Martin Dec 1 '14 at 8:26

Sheldon obviously considers Raj to be more intelligent than Leonard. It's demeonstrated numerous times.

What's more Raj is arguably the most successful scientist of the 3. Certainly more successful than Leonard.

Raj is very close to Sheldon in IQ. Probably around 178-180.

Kripke is Sheldon's intellectual superior. He regularly surpasses Sheldon's work in their field, and outsmarts him, WITHOUT a photographic memory. This would imply his base IQ is higher, to compensate for his physical disadvantage

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Unfortunately it has never been mentioned on the show but I too have wondered what the others IQ's are. I believe that based on how Sheldon believed that Raj knew what the anthropic principle was and believed Leonard did not could mean that Raj may be possibly smarter than Leonard. I am a big fan of the show and think that the order of IQ is...

  1. Sheldon (187)
  2. Amy (between 180-185)
  3. Kripke (maybe around 176-183)
  4. Raj (between 174-179)
  5. Leonard (173)
  6. Bernadett (between 170-175)
  7. Howard (between 160-165)
  8. Stuart (maybe around 120-130)
  9. Penny (maybe around 95-105)

Now this is completely based off of my opinion from watching the show, but I hope this helped.

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If you can toss in something about how you arrive to these conclusions, that would make this a fantastic answer. –  TylerShads Oct 18 '13 at 13:41
"Sheldon believed that Raj knew what the anthropic principle was and believed Leonard did not" - That could also be because he maybe thought an astrophysicist (like Raj) was much more likely to know about the anthropic principle (which is a common theme in cosmology) than an experimental physicist (like Leonard) and might have been one of Sheldon's usual statements about experimental physics not being as relevant as theoretical physics. It need not necessarily have come from a general judgement of Raj being more intelligent than Leonard. –  Napoleon Wilson Oct 18 '13 at 15:14
How have you arrived at these numbers? I found an IQ distribution chart (here iqcomparisonsite.com/iqtable.aspx) and Stuart being one in 10 of the population is a stretch but believable. IQ doesn't equate to success, but he just runs a failing comic book store. Howard at 160-165 is a stretch. That is at the 1 in 30,000 - 1 in 130,000 region. Howard is an intelligent engineer, but in the 7-30 people in a million region? 187 makes Sheldon one of one or two most intelligent people in the USA. –  iandotkelly Aug 5 '14 at 1:33
I would say that the IQ of Bernadett is way too big in your guess. –  Markus Klein Jan 10 at 23:21

Sheldon - 187
Lenard - 173
Amy (Sheldon finds her near equal)- 170 - 175
Kripke (Sheldon rival obviously close in intelligence)- 175 - 180
Raj (pretty much a guess, but he is an astrophysicists ) 155-160
Howard (engineers so pretty smart, but not an Einstein) 140 - 150
Bernadette (pretty much a guess, she develops drug "doesn't take a genius") - 125 - 135
Stuart (runs a comic book store "average") - 100 - 105
Penny (not too bright) - 90 - 100

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Sheldon and Leonard's IQ are actually from the show, but the rest of these are just guesses. –  Andrew Martin Dec 1 '14 at 9:11

protected by iandotkelly Jan 10 at 14:02

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