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If you want a fun way to do it and you're in person, you could have someone call a pair of dice d12 which will add up to exactly 8 (1+7, 2+6... 7+1) which is 4.86% according to any dice (though this would require identifiable dice, or rolling them separately to make them your lucky dice). Having a fixed number like that is fun and lets players have more "control" over their criticals.

If playing a game with arbitrary sized dice, this could be used by players to use dice closer to whichever "lucky number" you choose to cause criticals more often too, though still with the limit of 2dx unless honed further

Naturally this only works with a minimum of 2dx but without involving heavier mathematics during play than you've stated you likely can't get more exact.

Barring something like that, there's also the possibility of having a "crit dice" that you always include, though that probably goes against the fun of it.

If you want a fun way to do it and you're in person, you could have someone call a pair of the dice which have to add up to exactly 8 (e.g. 1+7, 2+6... 7+1) which is 4.86% according to anydice (though this would require identifiable dice, or rolling them separately to make them your lucky dice). Having a fixed number (eight) like that is fun and lets players have more "control" over their criticals.

If playing a game with arbitrary sized dice, this could be used by players to use dice closer to whichever "lucky number" you choose to cause criticals more often too, though still with the limit of 2dx unless honed further.

Naturally this only works with a minimum of 2dx but without involving heavier mathematics during play than you've stated you likely can't get more exact.

Barring something like that, there's also the possibility of having a "crit dice" that you always include, though that probably goes against the fun of it.

If you want a fun way to do it and you're in person, you could have someone call a pair of dice d12 which will add up to 8 which is 4.86% according to any dice (though this would require identifiable dice, or rolling them separately to make them your lucky dice). Having a fixed number like that is fun and lets players have more "control" over their criticals.

If playing a game with arbitrary sized dice, this could be used by players to use dice closer to whichever "lucky number" you choose to cause criticals more often too, though still with the limit of 2dx unless honed further

Naturally this only works with a minimum of 2dx but without involving heavier mathematics during play than you've stated you likely can't get more exact.

Barring something like that, there's also the possibility of having a "crit dice" that you always include, though that probably goes against the fun of it.

If you want a fun way to do it and you're in person, you could have someone call a pair of dice d12 which will add up to exactly 8 (1+7, 2+6... 7+1) which is 4.86% according to any dice (though this would require identifiable dice, or rolling them separately to make them your lucky dice). Having a fixed number like that is fun and lets players have more "control" over their criticals.

If playing a game with arbitrary sized dice, this could be used by players to use dice closer to whichever "lucky number" you choose to cause criticals more often too, though still with the limit of 2dx unless honed further

Naturally this only works with a minimum of 2dx but without involving heavier mathematics during play than you've stated you likely can't get more exact.

Barring something like that, there's also the possibility of having a "crit dice" that you always include, though that probably goes against the fun of it.

If you want a fun way to do it and you're in person, you could have someone call a pair of dice d12 which will add up to 8 which is 4.86% according to any dice (though this would require identifiable dice, or rolling them separately to make them your lucky dice). Having a fixed number like that is fun and lets players have more "control" over their criticals.

If playing a game with arbitrary sized dice, this could be used by players to use dice closer to whichever "lucky number" you choose to cause criticals more often too, though still with the limit of 2dx unless honed further

Naturally this only works with a minimum of 2d12 on the board and wouldn't work with arbitrary sized dice, but without involving heavier mathematics during play than you've stated you likely can't get more exact.

Barring something like that, there's also the possibility of having a "crit dice" that you always include, though that probably goes against the fun of it.

If you want a fun way to do it and you're in person, you could have someone call a pair of dice d12 which will add up to 8 which is 4.86% according to any dice (though this would require identifiable dice, or rolling them separately to make them your lucky dice). Having a fixed number like that is fun and lets players have more "control" over their criticals.

If playing a game with arbitrary sized dice, this could be used by players to use dice closer to whichever "lucky number" you choose to cause criticals more often too, though still with the limit of 2dx unless honed further

Naturally this only works with a minimum of 2dx but without involving heavier mathematics during play than you've stated you likely can't get more exact.

Barring something like that, there's also the possibility of having a "crit dice" that you always include, though that probably goes against the fun of it.