Chalmers also played a major role in Miami hiking its lead to 31 points after three quarters, scoring nine points on three 3s in the period.
After James' 54-game streak of scoring 20 or more points was snapped Thursday with a 15-point effort in a loss to Portland, he got going early against the Kings. James made all four of his shots and had 10 points in the opening quarter that included a couple of sensational fastbreak dunks off lob passes.
After a scoreless second quarter, James reached 20-point mark in the third quarter and didn't play in the fourth when the Heat used mostly its reserves.
"Finally we got back in our game in every aspect, offensively and defensively tonight," said Chalmers, who said he once made 12 3s in a high school game.
There has been plenty of off-the-court news concerning the Kings this week. The Maloof owners were believed to be in negotiations with a group headed by Chris Hansen that will buy the team and relocate to Seattle, where they will play next season.
Earlier Saturday, there was a report a local group was being formed to buy the Kings and build a $400 million downtown arena that would keep the team in Sacramento.
Chalmers made five 3-pointers and scored 19 first-half points, one fewer than his season high, helping the Heat to a 66-44 lead.
Both Bosh and James had 10 points in the first half, and Miller came off the bench to score nine on three 3s.
The Heat moved the ball with precision and continually got open looks in the first half when they had 16 assists and made 8-of-17 3-pointers. They also had a good half defensively with seven steals, five blocks and held the Kings to 37 percent shooting.
NOTES: A Miami fan was heckling Kings coach Keith Smart early in the third quarter with the Heat leading by 20 points. "Best team money can buy," Smart said to the boisterous fan. ... Chalmers had it going early, making three 3-pointers and scoring 13 points in the game's opening 5½ minutes when Miami had a 17-4 lead. ... It was only the second sellout this season for the Kings, who have the worst home attendance in the NBA. ... Sacramento Mayor Kevin Johnson was in a courtside seat. On Friday night, James was Johnson's guest at a St. HOPE fundraising dinner in Sacramento. ... Miami F Shane Battier missed his second straight game with a hamstring injury.