Scott Flansburg is faster than a calculator!
Flansburg can subtract, add, multiply, divide, and find square and cube roots in his head almost instantly with calculator accuracy. Around 1990 he began using his ability in an entertainment and educational context. He was dubbed "The Human Calculator" by Regis Philbin after appearing on Live with Regis and Kathy Lee.
Scott Flansburg is an American man often called a mental calculator. Dubbed The Human Calculator by Regis Philbin, in 2001 he was entered into the Guinness Book of World Records for speed of mental calculation. He is the annual host and ambassador for World Maths Day, and is a math educator and media personality. Flansburg has published the books Math Magic and Math Magic for Your Kids. (source : wikipedia