If tonight's lotto jackpot isn't won, it will only need to increase by 2 million to become the largest prize in New Zealand history

The largest prize claimed went to a Hibiscus Coast couple, who won 44 million in 2016.

The odds of winning Powerball sit at about one in 38 million - meaning there's a good chance the 42 million will roll over until Saturday's draw.

Lotto's jackpot starts at 4 million and increases each time until it's won or reaches 50 million dollars - when a "Must Be Won" draw is held.