Generating an effect number in a custom character sheet rollTemplate

I want to be able to subtract the die roll from the character stat to givean effect number that can be reported back with a rollTemplate. I know the calculation can not be done within the template, but can it be done when calling the rollTemplate? I have tried the following, but do not know how to reference the value of the roll. … {{roll=[[1d20]]}} … {{EffectNo=[[@{STRbcs}-{roll}]] }}   so in this case the effect number would be 4. if the roll is failed the effect number would be negative. I have spent quite some time looking at lots of posts and have come to the conclusion that it cant be done, however on the off chance that I have missed something, I thought I would put it out here to ask if anyone has any ideas   Thanks

Could you supply the current macro?  You can reuse rolls . If that is not enough it can be done via a Mod (API Script).

Custom Roll Parsing can probably resolve this, too. But Resuse Rolls will be a lot simpler. … [[@{STRbcs}-[[1d20]] ]] {{roll=$[[0]]}} … {{EffectNo=$[[1]] }} Notice no {{ }} brackets around the roll at the start - that's to make sure that roll isn't displayed in the output.

Many thanks for the prompt replies. I managed to get it using the  reuse rolls . however it took some time because i had to factor in some other modifiers to the attribute for the comparison.  &{template:statRoll}  [[ [[@{STRbcs}[bcs]+@{level}[level]+?{Modifier|0}[Mod]]] - [[1d20]] ]] {{name=@{character_name}}} {{statvalue=$[[0]]}} {{fumble=[[20]]}} {{crit=[[{round(([[@{STRbcs}+@{level}+?{Modifier|0}]])/10),1}kh1]]}} {{failed=[[@{STRbcs}+@{level}+1]]+?{Modifier|0}[Mod] }} {{roll=$[[1]]}} {{statname=Strength}} {{EffectNo=$[[2]]}} However until tonight i had no idea you could reuse rolls. The code doesn't look pretty but at least it works. When i get the time I'll have another play and try to tidy it up some more.