The average IQ (intelligence quotient) is 100, with the vast majority of people scoring right around that number. Only about 2 to 3 percent of people score above 130 or below 70. An IQ of 130 is considered the threshold for giftedness.
While we don't know if Albert Einstein, arguably the most famous genius, ever took an IQ test, his IQ has been said to be near 160. Steven Hawking and Bill Gates have also been said to have an IQ of 160.