A report from the Central Statistics Office shows that 81% of all Irish households have access to a computer, while 78% had access to the internet.
The CSO said the home computer figure for 2011 was up 16 percentage points from the 65% recorded in 2007.
The internet access figure is up from 72% in 2010 and 57% in 2007.
The 2011 internet access percentage is slightly above the EU average, according to the CSO.
At the end of June 2011, there were 1.66m internet subscriptions in Ireland, slightly down from the previous three months, but up 5.2% from June 2010.
The report on information society and telecommunications in households also found that holiday accommodation and other travel arrangements were the most popular types of online purchases.
The CSO survey did not measure the amount of money people spent over the internet.