NEW YORK — To no one’s surprise, Taylor Swift’s surprise album “folklore” is dominating the music charts.

Swift’s eighth album debuted at No. 1 on Billboard’s 200 albums chart this week, marking the best first-week sales of the year and giving the pop star her seventh No. 1 title on the chart. According to Nielsen Music/MRC Data, the album sold 846,000 equivalent albums in the U.S. based on a combination of sales and streams.

This cover image released by Republic Records shows “Folklore,” by Taylor Swift. Republic Records via AP

The last album to sell more units in a single week? Swift’s “Lover” album, released last August.

The success makes Swift, 30, the first artist to have seven different albums sell at least 500,000 albums in a single week. Swift dropped “folklore” in a surprise form, announcing the album’s release a day before it came out on July 24. It features production and songwriting work from The National’s Aaron Dessner and frequent collaborator Jack Antonoff.

With 289.85 million on-demand streams of its songs, “folklore” also marks the largest streaming week for an album by a female act this year. Swift is third overall, behind the powerful streaming efforts of Juice WRLD’s “Legends Never Die” and Lil Uzi Vert’s “Eternal Atake.”

“Folklore” was only released digitally, but will be available as a CD on Aug. 7. The album was sold with a number of merchandise bundles, packaged with cardigans, hoodies, T-shirts, cell phone cases and more. A digital version of “folklore” came with a purchase of one of the merchandise items, counting as an album sale for Swift.