I made a spreadsheet that helps you track your net gain for each transaction and your total net gain. It also keeps track of how much you had paid for each bitcoin.
Link is here if you want to check it out: https://docs.google.com/spreadsheets/d/1Awcx961Qm_cJw7X-7hsKEGCzS-0yMw0TqwbniaxNkeU/edit?usp=sharing
Here is a blank copy if you want to copy it and use it yourself: https://docs.google.com/spreadsheets/d/1J7Ois6bVzhIs7UL8kHxvtMa1aoepKxbvUQ1i_Xvmm3g/edit?usp=sharing
Please let me know if you guys have any suggestions.