NBC had the highest weekly
Nielsen ratings in its history with
Shōgun. Its 26.3 average rating was the second highest in television history after ABC's with
Roots. An average of 32.9% of all television households watched at least part of the series. The miniseries' success was credited with causing the
mass-market paperback edition of Clavell's novel to become the best-selling paperback in the United States, with 2.1 million copies in print during 1980, and increased awareness of Japanese culture in America. In the documentary
The Making of 'Shōgun' it is stated that the rise of Japanese food establishments in the United States (particularly
sushi houses) is attributed to
Shōgun. It was also noted that during the week of broadcast, many restaurants and movie houses saw a decrease in business. The documentary states many stayed home to watch
Shōgun—unprecedented for a television broadcast. (The home
VCR was not yet ubiquitous and still expensive in 1980.)