The big Powerball jackpot has not been won tonight.

Two players who bought tickets in Ashburton and Dunedin share the $1 million First Division prize, but Powerball rolls over to Saturday's draw.

By then the jackpot will swell to $25 million, which is the most in Powerball since June 2014.

On that occasion players from Auckland and Hastings won $13 million each.