There are a lot of ways to track your profits. I mainly use altpocket for my altcoin investments (I can directly import my buy-sell logs from bittrex, this makes my life a lot easier when it comes to tracking my investments). And on my mobile device I use blockfolio to track my bitcoin investments.
If you don't have a mobile device or don't want to rely on a 3rd party service you can also do it the old-fashioned way and use excel. But that requires more time and some excel skills.
I just keep an eye on the market of bitcoin, which side it is bound. I just calculate roughly with myself and not a special program for my investment. When the price goes up I realize that my investment grows and when there is fall in the price my investment reduces. Just this and nothing more, because keeping records and maintain figures I think is not good for mental relaxation. Therefore I never took it serious.