Joseph Parker's world heavyweight title win on Saturday night wasn't just celebrated at Vector Arena on the night but at Burger King outlets all across New Zealand the next day.

The fast food company have been a key sponsor of the Kiwi boxer on his road to a title fight and recently started a promotion where they would give discounted meals depending on whether Parker won his bout or not.

Burger King's promotion for $2 Whoppers only happened because Joseph Parker won his title fight against Andy Ruiz Jr. Source: Supplied

With a world title on the line, Burger King offered their biggest steal yet - $2 Whoppers.

The Whopper is the company's trademark burger and usually sells for $6.55 on its own or $9.50 as part of a combo meal so when Parker claimed his title, Burger King workers all around New Zealand knew what they would be making a lot of the next day.

But just how many might even stun the world champion boxer.

Reportedly, 137,000 Whoppers were sold during the promotion's hours of 11am-5pm yesterday meaning the burger filled with lettuce, onion, tomato, pickles and a patty were made once every 4.9 seconds.