One ticket has won $15.5 million in tonight's must-win Lotto draw.

Half of the ticket proceeds will go towards Cyclone Gabrielle relief.

The winning numbers are: 37, 17, 4, 27, 38, 11, Bonus 26, Powerball 3.

The big winner shared Lotto First Division with one other ticket, which takes home $500,000.

The $15.5m winning ticket was bought on MyLotto by a Canterbury player.

Strike's top prize wasn't won.

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Early ticket purchases encouraged for tonight's $15m Lotto draw

Sat, Mar 18

A Lotto spokesperson said although they won't have the final amount raised for the cyclone relief appeal until Sunday, they're expecting a figure similar to their 2011 Christchurch earthquake appeal — around $8 million.

Tonight's must-win draw was won by a ticket which struck Powerball's First Division, meaning they got all six Lotto numbers and the Powerball.