Given the evidence, Luffy's IQ could easily be anywhere between 90 and 130. This would make his intelligence at least average and maybe a little above average, although not quite genius-level. His morality, choices, actions and accomplishments should say as much about him.
Vegapunk is undoubtedly the most intelligent person in the series. While his intelligence has not been tested in the midst of a battle, it is safe to assume that a person who is considered to be at least 500 years ahead of any other person would have no problem using it in battle.
Nico Robin, however, is undoubtedly the smartest amongst the Straw Hat pirates. She's the only survivor of the island of Ohara, a people renowned for their general intelligence and academic capabilities. She's also one of, if not the only person alive in the One Piece world who can read the Poneglyphs.
Robin - 140. she s history scientist; Nami - 135.
Roronoa Zoro
Like his captain, Zoro isn't really intelligent. He's terrible at directions, even getting lost in their own ship, and prefers to just cut his way through. After all, he spent most of his life improving his sword and becoming the strongest swordsman.
Getting into more directly intelligent territory, Sanji is often an underappreciated talent when it comes to his cleverness and creativity. He's a master cook that can not only cook a variety of dishes but can replicate the recipes and flavors of items that he's tasted only once.
Goku: 76, even though you might think his IQ could be even lower sometimes, he often proves he can do some smart things too, especially while fighting and especially during DBZ.
Vickie Stranger Things. We don't spend a lot of time with Vickie in Stranger Things season 4, but we know that she plays int he school band with Robin. Robin has a crush on Vickie, but gets tongue-tied around her.
According to Ukyo Kodachi, Sakura has a rank of 174 in intelligence, right after Shikamaru and before ninja considered geniuses, like Katasuke. Overall, Sakura is a kunoichi known mainly for her intelligence (and chakra control), a feat that is a basis for the kind of ninja she became.
Well, Chopper is actually the youngest Straw Hat, and he is periodically treated as such. It is not unusual for Chopper to be babied by characters such as Robin and Zoro.
His score was the highest that had ever been obtained. In terms of IQ, the psychologist related that the figure would be between 250 and 300. Late in life William Sidis took general intelligence tests for Civil Service positions in New York and Boston. His phenomenal ratings are matter of record.
William James Sidis has the World's Highest IQ. Anywhere from 250 to 300 is his IQ score, almost twice the score of Albert Einstein. At the age of eleven, William famously entered Harvard University, becoming the youngest person to enter.
The finding of this study suggested that anime viewers has higher level of general knowledge comparing with the non- anime viewers and as well as higher IQ level significantly in a specific group, besides anime can be used to spread a background about any culture and plays a role in increase the economy.
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2/9 Sanji. Sanji is the second-strongest Officer of the Straw Hat Pirates and also the cook of the crew. Over the years, he has trained himself to be an incredibly competent fighter.
Luffy is the by far the strongest member of the Straw Hat Pirates. As the Fifth Emperor of the Sea, Luffy is incredibly powerful and is able to hold his own against the Yonko of the One Piece world. He uses the power of the Gomu Gomu no Mi in incredible ways and keeps getting stronger.
115 to 129: Above average or bright. 130 to 144: Moderately gifted. 145 to 159: Highly gifted.
It is consistently shown that Naruto isn't knowledgeable, he doesn't know things. However, it is also consistently shown that he is actually really bright and smart when it comes to practice. I think Naruto's IQ would be over 110, possibly close to 120.