The match ended 2-2, sending Liverpool back to the top of the table at least until Saturday's later kickoffs.
Yohan Cabaye had put Newcastle ahead with a long-distance goal in the 23rd minute, but Liverpool equalised through Gerrard following a penalty decision that saw Newcastle's Mapou Yanga-Mbiwa sent off.
Liverpool's Daniel Sturridge picked out Luis Suarez with a long, diagonal ball and Suarez moved into the box before falling under pressure from Yanga-Mbiwa.
Referee Andre Marriner awarded a penalty and showed Yanga-Mbiwa a red card.
Gerrard made no mistake from the penalty spot, beating Newcastle's Tim Krul—who guessed the right way—with a low shot to the keeper's right.
Gerrard reached the 100-goal mark in 449 Premier League appearances. Of those 100, 20 have come from the penalty spot.
His first Premier League goal came Dec. 5, 1999, against Sheffield Wednesday at Anfield, when Gerrard was 19.