Car prices could surge 10% and more as the United Auto Workers threatens additional walkouts, according to experts — even as the bitter standoff threatens GM and Ford with punishing losses as high as $125 million a week.

Rob Handfield, a business professor at North Carolina State University, predicts a month-long strike could lead to a roughly 10% increase in vehicle prices with hikes depending on the make and model.

“If it goes for a month or more, that might start eating into their inventory and when dealers start having fewer cars on the lot, you’re likely to see prices go up at that point,” Handfield told The Post on Tuesday. “They could go up as much as 10%.”

“The Big Three have fixed prices they provide to dealers, but that’s separate from the price the dealers charge,” Handfield continued, referring to strike targets Ford, GM and Jeep-maker Stellantis.

“The UAW is trying to hit the plants that have the most expensive vehicles – the trucks and the SUVs – they’re really trying to hurt them as much as they can,” he added.

Tom Maoli, a Ford dealership owner in New Jersey, expects to raise his prices by 20% once the strike continues for two weeks. Workers walked off the job last Friday.

“Inventories on lots of dealerships will start drying up as they get sold and there won’t be enough cars to go around,” Maoli told CBS News, noting that car parts will actually be the “biggest issue.”

“That means tires, brakes, anything you need to change and keep your car running.”

The Big Three grew their inventories in August in anticipation of this strike, which has affected three major assembly plants: a GM factory in Wentzville, Mo., a Ford plant in Wayne, Mich., and a Stellantis Jeep plant in Toledo, Ohio.

Collectively, GM, Ford and Stellantis “produce almost half of domestically assembled cars,” according to Goldman Sachs — 14,000 of which are produced weekly at the targeted plants.

The investment bank predicted in a note shared with The Post that “auto production would likely fall sharply — we assume to roughly zero — at any company impacted by a strike.”

A halt in operations at this scale would also affect quarterly annualized growth by as much 0.1% each week the strike lasts, according to Goldman.

At GM and Ford, that percentage equates to a $100 million to $125 million weekly loss in revenue for each company.

GM’s Fairfax, Kan., plant could also be forced to idle “as soon as next week,” Goldman said, as the production site sources some materials from the automaker’s Wentzville plant.

The bank’s calculations are based on weekly revenue estimates at the GM and Ford plants affected by the ongoing strike, as well as the car models produced at each site.

GM’s Wentzville, Mo., plant makes the GMC Canyon and Colorado, while Ford’s Wayne, Mich., production site pumps out its Bronco and Ranger models.

Though unionized Stellantis workers are also on the picket lines, the Jeep-maker was not included in the forecast.

A GM spokesperson told The Post that the company will address the strike’s impacts during its next earnings call, on Oct. 24.

“Suffice to say, strikes hurt everyone and not just the company,” the GM spokesperson said.

A representative for Ford also declined to speculate on the impact of the strike, adding that the company “continues to negotiate with the UAW, and our focus is on reaching a deal that rewards our employees, allows for the continuation of Ford’s unique position as the most American automaker and enables Ford to invest and grow. We’re working for a win-win.”

Representatives at Stellantis did not immediately respond to The Post’s request for comment.

As of Tuesday, about 13,000 UAW union members are still picketing, fighting for new contracts that offer a 40% pay raise, a 32-hour work week and benefits for office workers — which President Joe Biden has endorsed.

“Over the last two — past decade, auto companies have seen record profits, including the last few years, because of the extraordinary skill and sacrifices of the UAW workers,” the 80-year-old President said at the White House Friday, hours after the strike began.

“Those record profits have not been shared fairly, in my view, with those workers.”

Biden did not specifically recommend terms for a deal, but said Ford, General Motors and Stellantis “should go further to ensure record corporate profits mean record contracts.”

UAW president Shawn Fain did just that, pressuring the Big Three Detroit automakers to write up new contracts that take the union’s demands into account as early as noon on Friday, he said in a YouTube video posted late Monday.

In the clip, Fain urged GM, Ford and Stellantis to add job protections to its worker contracts as the industry moves towards a fully-electric future.

Fain did not say which other plants would be targeted if the already-historic strike widened, which is the first time the 88-year-old union staged simultaneous walkouts at all three Big Three automakers.

The UAW represents 150,000 workers across the Big Three — only about 13,000 of which are currently striking.

Daniel Ives, a senior analyst for Wedbush, said a prolonged strike will hamper Detroit’s uphill effort to top Musk’s Tesla in the ultra-competitive electric vehicle market.

“This is a potential nightmare situation for GM and Ford as both 313 stalwarts are in the early stages of a massive EV transformation path for the next decade that will define future success,” Ives said, referencing Detroit’s “313” area code.