Excitement levels are reaching fever pitch as fans prepare to ride another emotional roller-coaster when the Matildas take on England in the Women's World Cup semi-final.

More than 80,000 people are expected to pack a sold-out Stadium Australia on Wednesday night, while thousands of others will tune in from live sites around the country.

They include the FIFA Fan Festival at Sydney's Tumbalong Park, where more than 202,000 people have already enjoyed the site's food, games and music throughout the tournament.

In Melbourne, AAMI Park will be transformed from sports stadium to live site, with the must-win game broadcast on the big screen.

In Perth, thousands are expected to descend on Forrest Place in the CBD and Perth Rectangular Stadium to watch hometown hero and Matildas star Sam Kerr.

Dozens of other fan zones have been set up across the country, while millions of viewers will tune in to the semi-final from home or their local pub.

Meanwhile, sales of Matildas scarves have soared on eBay Australia by more than 2600 per cent, the e-commerce platform says.

"In the last two weeks alone, sales of Matildas jerseys have kicked up over 450 per cent on eBay, while sales of the iconic Matildas scarf surged 2,650 per cent," spokesperson Zannie Abbot said.

"With Australia taking on the world and inspiring the next generation of women and girls in sports, it's great to see the nation get behind their home team with unwavering support."

Broadcaster Channel Seven reported 4.17 million people tuned in to the Matildas' quarter-final against France on Saturday night.

Nearly 12 million viewers have watched the Matildas' matches live throughout the tournament.

Prime Minister Anthony Albanese is encouraging Australians to rally behind the team that has inspired a nation.

"The whole of Australia is behind the Tillies, and we wish Sam Kerr and that wonderful team all the best," he said on Tuesday.

Mr Albanese remains committed to a public holiday if the Matildas win the World Cup, with the support of the state and territory premiers.

© AAP 2023