Here's the excel file I made a few weeks ago, it's an improvement on one someone else had made... Each time I make a transaction I just enter the data into the yellow highlighted areas and I update current price in the summary tab. I have a tab for each of the 3 currencies I own. It has some random data in there right now, you can delete it and enter your own.
https://www.dropbox.com/s/nqj5t5chac0a70o/Crypto%20Tracker2.xlsx?dl=0