If you're looking for a meeting place or a good stop around ½ or halfway between Los Angeles and Carmel, CA, you can try Blackwells Corner, CA, which is about 2½ hours northwest of Los Angeles, or about 3 hours southeast of Carmel, CA.
Other possible places to stop near the midpoint include Kecks Corner, Packwood, Annette, and Cholame.
About ¼ or a fourth of the way, you can stop at Lamont, CA. This is about 1½ hours northwest of Los Angeles.
About ⅓ or a third of the way, you can stop at Bakersfield, CA. This is almost 2 hours northwest of Los Angeles.
About ⅔ or two thirds of the way, you can stop at San Lawrence Terrace, CA. This is a little over 3 hours northwest of Los Angeles, or about 2 hours southeast of Carmel, CA.
About ¾ or three fourths of the way, you can stop at Greenfield, CA. This is about 4 hours northwest of Los Angeles, or about 1 hour southeast of Carmel, CA.
If you drive straight through without stopping at all, the total distance is 323 miles. The distances shown above don't include local roads to get into each town, so if you're planning a long road trip, make sure you factor in traffic and road conditions, rest stop breaks, and interesting detours along the way. If you're in a rush, you can do the trip with zero stops, and your total travel time would be around 5 hours, 11 minutes.