When using any kind of jutsu in a thread, they cost a certain amount of chakra. So how much does a jutsu cost per rank you may ask? Well ask no more!
E rank jutsu: 5 chakra
D rank jutsu: 10 chakra
C rank jutsu: 15 chakra
B rank jutsu: 20 chakra
A rank jutsu: 30 chakra
S rank jutsu cost: 50 chakra
Ok so just because you start with 50 chakra doesn't mean you can go and use and S rank jutsu. You may only use jutsu that apply to your rank, for example genin can only use E rank jutsu and D rank jutsu. Chunnin can use E,D,C rank jutsu, and it goes on and on and on.
Remember to post in a spoiler the jutsu you just used and how much chakra you used and how much you have left. Also you should have a link of your jutsu list in your signature.