Ok i know Nikk has already created a chart for the amount of chakra:
Jounin Exams
E-10-20 depending on range Far is 20 close to mid is 10.
D-20-30 depending on Range Far is 30 close to mis is 20.
C-30-50-60 Depending on Range Far is 60, Mid is 50, and Close is 30
B-60-70-80
A-100-110-120
S-140-160-180
and the Forbiddens are 200 and up
Now that there is a chart for us to follow since we all basicly have our own custom jutsus following this chart put an exact amount of how much chakra your jutsus uses so we know how much chakra to take off of your chakra bar ...be reasonable
(nikk i know i didnt tell you about this it was a idea that kinda came up outta nowhere lol so idk if you want to do it like this or like do you want to do it by just taking off a certain amount)