Armor Class Table:

As armor doesn't give any bonus to AC, there must
be a way to increase your armor class.

Presented below is the table determining what a
character's armor class is at any given level.

To discover your armor class follow this formula:

10 + Dex mod + Class AC + Size mod + Shield AC + Other.

These bonuses below apply to both flatfooted and
touch AC as well.

Level     Fighter     Expert     Spellcaster
  1          +6         +4          +3
  2----------+6---------+4----------+3
  3          +7         +5          +4
  4----------+7---------+5----------+4
  5          +7         +5          +4
  6----------+8---------+6----------+5
  7          +8         +6          +5
  8----------+8---------+6----------+5
  9          +9         +7          +6
 10----------+9---------+7----------+6
 11          +9         +7          +6
 12---------+10---------+8----------+7
 13         +10         +8          +7
 14---------+10---------+8----------+7
 15         +11         +9          +8
 16---------+11---------+9----------+8
 17         +11         +9          +8
 18---------+12--------+10----------+9
 19         +12        +10          +9
 20---------+12--------+10----------+9