Brokerage charges in stock trading ( ICICI DIRECT AND SBI CAP)

Dear Mahesh ji, Can you please let us know how brokerage is calculated when buying equities. Is there any difference in service charges if u buy a Stock in NSE Vs BSE. If I see, calculated charges are not uniform always. Can you please provide your views? Thanks & Regards M Rajkumar 
M rajkumar ji 
Brokerage charges in not depend on trading platforms like NSE or BSE it always depend on your broker for example if your broker is Icici direct than see complete brokerage plans of Icici direct here 
Click here for brokerage charge for icici direct
If your broker is SBI CAP SEC than see brokerage plans here 
https://www.sbicapsec.com/trading/faqs.html 
Regards 
Mahesh Kaushik