1. Tell us the full name of the sheet, as there exists the "Saga Edition" and the "Star Wars Revised RPG" sheets, both being referenced as SW d20. 2. Give an more fdetailed example of a specific roll that doesn't calculate correctly, and what value you expect to get 3. telling what modifiers it uses 4. if you have a hunch on what part that it does wrong Currently you have only hinted to the problem, and we can't diagnoze unless you are more specific. The Saga Edition Sheet have a wiki page.