AC to HP Conversion Charts

These charts help Game Masters find monsters that are equivalent by AC and Monster Level (HD). 

The main article about these charts is on the blog. For he technically inclined (or curious), the open source code to generate these tables is available as a Jupyter Notebook on Kaggle.

One way to think of HP and AC is as a way for GM’s to manipulate how many rolls are needed to deplete a monster of HP.

For example in ShadowDark, a typical Level 1 (HD1) monster has 4 hit-points and armor-class 12. Players will roll a d20 against the AC12 and hit 45% of the time. Players attacking with a d6 weapon will make three (3) attack-rolls and hit twice before its demise. In short, it takes three rolls to kill a Level 1 monster by using a d6 weapon.

These charts help you do that with any monster in ShadowDark or HD8 system (B/X, OSE, Labyrinth Lord)

These charts pair well with books like :

• Monster Overhaul
• Forge of Foes
• Guide to Shadowdark Monster Statistics
• AD&D Monster Database: Searchable (includes 0e and Basic)

And other similar works.