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How is post score calculated?

TL;DR Each post is scored based on where and how long it is.

First, we define a few constants, which can be changed in the admin page or in the code:

DEFAULT_SCORE       = 0.1
MODIFIER_FIRST      = 0.1
MODIFIER_WORD       = 0.02
MODIFIER_CHAR       = 0.0005

... and a few variables, which are computed immediately before the post's score is calculated:

CHARS          = [the number of alphanumeric characters in the post, not counting markup]
WORDS          = [the number of whitespace-separated strings of characters, not counting markup]
FIRST          = [1 if the post is the first in a topic, 0 otherwise]
MODIFIER_FORUM = [the forum-specific multiplier, or 1 if it is not set]

... then we solve this equation:

SCORE = (DEFAULT_SCORE +
         MODIFIER_FIRST * FIRST +
         MODIFIER_CHAR * ln(CHARS)^2 +
         MODIFIER_WORD * ln(WORDS)^2) *
         MODIFIER_FORUM

How can I convert from Post Count Plus to AutoRank?

• Set base score to 1.
• Set all bonuses to 0.
• Set the "Score:" text to "Posts:".
• Use the convert link from the top of the page to convert your Post Count Plus ranks.