Question about BB/100

Ok, Im not exactly sure how to calculate BB/100 for NL games. Im assuming BB stands for Big Blind, am I correct? So does it mean # of BBs won per 100 hands??

If I am right does this mean that my BB is as follows?

Hands Played 347
Profit: 17.19
Big Blinds won: 171.9
BB/100: 49.53

This doesnt seem right. Can someone tell me how to calculate it correctly, I would like to know how Im doing.

BB as everyone uses it here (ptBB/100) stands for Big Bet and is twice the big blind. Yeah it's confusing. So your ptBB/100 is 24.76.

even when you are playing NL?

yes. even when you are playing NL.

Its because everyone uses pokertracker to keep track of winrates and pokertracker was originally designed for limit.

PT shows a BB/100 which is actually Big Bet / 100