More than 50,000 people are expected at the Millennium Stadium on Saturday after snapping up free tickets for a big screen viewing of the semi-final clash against France.
Other Wales supporters have flown to Auckland to watch the biggest game in Welsh rugby history - and Charteris admits the commitment has buoyed the squad.
"It is a big undertaking for people and it shows the support for us," Charteris said.
"Knowing all the effort our supporters are making and the excitement back home, it is an extra incentive for us to reach the final. It's the least we can do."
Charteris has overcome a shoulder injury that forced him off at half-time of the quarter-final victory over Ireland to take his place in the Wales second-row against Les Bleus.
Charteris delivered an outstanding 40-minute display against Ireland, making 16 tackles in his 40 minutes, but he played down the quality of his performance.
"That's just the way a game goes sometimes. If they keep running at you, you've got to tackle them and make as many as you can," added the Dragons lock.
"The work-rate was a sign, in the first half, that Ireland had a fair bit of possession.
"It wasn't ideal. I would rather be making less tackles because it would show we were probably having more of the ball."
Charteris is now braced for a stern examination from a France side that has won nine of the previous 11 encounters against Wales.
"We have to get parity or win the battle up front," he said. "Do that and we have seen what our backs can do.
"We will find out on Saturday whether we have got it right. We are always working on new things. We have the philosophy that if we do our jobs spot-on, we will do well.
"If we get our processes right, we are confident we are going to get the right result.
"There aren't any issues in the team. There are no egos and no arrogance, we've had a lot of fun and enjoyed the experience.
"We believed, coming into this tournament, we could win it.
"The coaches encourage us to play quite an expansive game. It's fun to play. I think that's the key, because if you weren't enjoying it, it would be a long campaign."
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