Converting Dungeon and Dragons Modifiers to AGE Ability Scores

Use this chart to convert between Dungeon and Dragons ability modifiers and AGE ability scores. Since each system uses different dice and those dice affect tests we need to compare then with their change to succeed. You can see that the 50% lines up with both systems with TN11 which is why I centered the table that way. Both raw D20 and 3d6 rolls are included as that is the base comparison. Then we can calculated the modifiers for each:

• DnD is "=ROUNDDOWN(F5/2,0)-5"
• AGE is ""=G5-11"

The mapping between the two systems isn't a one to one relationship because DnD has extra rows as compared to AGE. We need to look up both directions matching against the percentage to get the best results going both ways. You can see it does matter that DnD does a divide by two as there are several rolls that match better with the lower versus the higher.

The only massaging needed is to round the AGE% to the nearest multiple of 5 percent. This is done since 95.4% and 4.6% are close enough to match well but the decimal doesn't end up matching in the excel formula.

Converting Ability Types

AGE and DnD have different named ability for the mostly similar things. Here is my conversion framework.

For the DnD types that are a sum AGE types, do your best to either:

• Label them as a single category if a character or monster is clearly one of the AGE types
• Split them at the DnD level before conversion to match a single AGE type
• Split the result after conversion and add the right amount to each AGE type
• Make them equal so map STR twice, once to STR and a second time to FIG

Hope this helps your games and cuts down on GM preparation.