ARV Estimations Help

[Lisa Winklepleck]

Hi everyone, I'm in the process of analyzing my very first purchase and am struggling figuring out the ARV of a prospective house. I understand that the ARV is the value of the house the bank/lender appraises your house at after rehab. My confusion though is how do I estimate this? I've read to pull comps but aren't comps based on selling/listing price? Is there a way to calculate an ARV off the listing price or is there even a difference? What am I missing in this logic? Any help is appreciated!