"I definitely feel I made the right decision," Johnson said by telephone. "Cal is a great place."
Johnson will fax in his letter of intent Thursday, officially becoming the Golden Bears' third member of the Class of 2012. Point guard Tyrone Wallace and power forward Kaileb Rodriguez signed with Cal during the early signing period last November.
The 6-foot-7 Johnson cited a combination of both on and off-court considerations in choosing the Bears over Arizona State.
"The competitiveness of the school is what stood out, both academically and athletically," said Johnson, who visited Berkeley last week, "It is going to push me to my best."
Johnson said coaches told him he could play as a freshman, coming off the bench to try and help replace senior forward Harper Kamp.
"They said I'd be playing as a (combination) 3 or 4, facing up and using my jump shot to create mismatches," he said.
Johnson expects the Bears to be back in the NCAA Tournament next season and compete for the Pac-12 title, even with the strong recruiting classes coming it at Arizona and UCLA.
If anything, Johnson expects the conference to return to prominence soon.
"There is a lot of pieces getting added to teams," he said. "People are going to take notice of the Pac-12 again."
Dan Greenspan is the publisher of Cal Sports Digest and covers the Pac-12 for Fox Sports/Scout.com. Follow him on Twitter @DanGreenspan.