SAN FRANCISCO — Google is about to change the way its influential search engine recommends websites on smartphones in a shift that’s expected to sway where millions of people shop, eat and find information.

The revised formula, scheduled to be released Tuesday, will favor websites that Google defines as “mobile-friendly.” Websites that don’t fit the description will be demoted in Google’s search results on smartphones while those meeting the criteria will be more likely to appear at the top of the rankings – a prized position that can translate into more visitors and money.

Google’s new search formula for smartphones gives more weight to websites designed to load quickly on mobile devices, with content easily accessible by scrolling up and down, without having to also swipe to the left or right. The Associated Press

Although Google’s new formula won’t affect searches on desktop and laptop computers, it will have a huge influence on how and where people spend their money, given that more people are relying on their smartphones to compare products in stores and look for restaurants.

That’s why Google’s new rating system is being billed by some search experts as “Mobile-geddon.”

“Some sites are going to be in for a big surprise when they find a drastic change in the amount of people visiting them from mobile devices,” said Itai Sadan, CEO of website-building service Duda.

It’s probably the most significant change that Google Inc. has ever made to its mobile search rankings, according to Matt McGee, editor-in-chief for Search Engine Land, a trade publication that follows every tweak that the company makes to its closely guarded algorithms.

To stay in Google’s good graces, websites must be designed so they load quickly on mobile devices. Content must also be easily accessible by scrolling up and down – without having to also swipe to the left or right. It also helps if all buttons for making purchases or taking other actions on the website can be easily seen and touched on smaller screens.

If a website has been designed only with PC users in mind, the graphics take longer to load on smartphones and the columns of text don’t all fit on the smaller screens, to the aggravation of someone trying to read it.

Google has been urging websites to cater to mobile devices for years, mainly because that is where people are increasingly searching for information.

The number of mobile searches in the U.S. is rising by about 5 percent while inquiries on PCs are dipping slightly, according to research firm comScore Inc.

In the final three months of last year, 29 percent of all U.S. search requests – about 18.5 billion – were made on mobile devices, comScore estimated. Google processes the bulk of searches – two-thirds in the U.S. and even more in many other countries.

While most major merchants and big companies already have websites likely to meet Google’s mobile standard, the new formula threatens to hurt millions of small businesses that haven’t had the money or incentive to adapt their sites for smartphones.

“A lot of small sites haven’t really had a reason to be mobile friendly until now, and it’s not going to be easy for them to make the changes,” McGee said.

Google’s search formula weighs a variety of factors to determine the rankings of its results.

One of the most important considerations has always been whether a site contains the most pertinent information sought by a search request.

But a new pecking order in Google’s mobile search may relegate some sites to the back pages of the search results, even if their content is more relevant to a search request than other sites that happen to be easier to access on smartphones.

That will be an unfortunate consequence, but also justifiable because a person might not even bother to look at sites that take a long time to open or difficult to read on mobile devices, Gartner analyst Whit Andrews said.

“Availability is part of relevancy,” Andrews said. “A lot of people aren’t going to think something is relevant if they can’t get it to appear on their iPhone.”

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