How to calculate first call resolution?

Sir,

if you using software system , there is an option called call log , agent can select the call resolution from the drop list option that you added like :( incoming call -  request -  add service ). then you can export the report and sort it.

if you using excel , you have to crate a call log. There is an option by gmail to create a page can help you for that.

if you have the above , so it will be  easy to calculate the first call resolution .