Millions of dollars are expected to come into Rotorua as a result of the Trenz conference happening this month.

Trenz is New Zealand's $39.1 billion tourism industry's most important annual business event and takes place this year in Rotorua from May 13 to 19.

Rotorua Economic Development chief executive Michelle Templer said from previous experience hosting the conference she knew the impact both in terms of direct spend and the legacy it left.

"Based on Dunedin's experience last year, we're expecting to see an estimated total of 5361 nights booked for Trenz, generating millions of dollars of direct revenue and