According to Consumer New Zealand's guide to Going Digital, the cost of a standard set-top terrestrial box set would cost between $80 and $200.
A set-top satellite box set would cost between $80 and $180.
Freeview's Sam Irvine said most people who were yet to switch were probably leaving it until the last minute.
Research showed remaining households were "very similar across the demographics of age and also ethnicity."
A breakdown of the figures showed a third of the homes still using the analogue signal were located in the Greater Wellington region. About 14 per cent were in the Taranaki region, and just over 9 per cent were in Palmerston North.
Mr Irvine said households with more than one television needed to ensure all sets were using the digital signal.
"There's a much larger number of people [than those who haven't switched] who haven't done anything about their second, third of fourth sets of TVs."