Company is looking to send me to a new city. Some google searches show that overall the city is 65% more expensive to live in. How do I make sure that my company gives me the correct change in salary?

Moving from Alabama to Colorado. The cost of rent will be close to $1000 more per month for a smaller place than where I'm currently living. Buying a house is close to 200-300k more than what I could buy a house in Alabama for. I'm wanting to know how much I should ask my company to increase my salary by. The website BestPlaces states it would be "Denver, Colorado is 64.6% more expensive" than where I currently live. Not sure how to equate that to salary. Any help is greatly appreciated.

EDIT: Further clarification: The company is not forcing this move on me, but instead it was more of a request from me as my Fiance is moving to Denver. It's not an out of the ordinary place for someone in my company to move to.

Submitted January 03, 2019 at 11:25AM by werd13 http://bit.ly/2F6ZXP8