Survey results show this year's main concerts at Forsyth Barr Stadium have generated almost $20m for the local economy.

Stadium managers have just released the economic impact data, after surveying thousands of ticket holders.

They say the Rod Stewart, Neil Diamond and Fleetwood Mac concerts have provided a significant boost to the city's businesses.

Last month's Fleetwood Mac concert was attended by almost 35,000 people, many of whom were visiting from out of Dunedin.

The other two main concerts were smaller, but still attracted thousands of visitors to the city.

Hundreds of locals also gained work in relation to the events.