After using the search bar to try and figure out a solution on my own I have run into a snag. I am trying to figure out what length stem I need for a good fit as I dont believe my 110mm stem is right for my body. I used the fit calculator at wrenchscience and it said that my perfect reach should be 64.96cm. I measured the top tube on my current frame and it was 20in(if I measured it correctly) or converted to cm is 50.8. and my current stem is 110mm. Then using the search function I found a post where it said that I should use the wrenchscience reach measurement and then subtract the top tube length to get the proper stem length for me.

Using this so far I have not come to any reasonable sane conclusions that even make sense. I converted all numbers to mm since that is what stem length is in and it comes out to 140mm??? What am I missing or doing wrong? So as you can see I am completely lost. Thank you for any help or advice you can give. I am trying to save the 100 bucks for a fitting at my LBS until funds allow.