> I very much dislike the idea that you, as an employer, are deciding what proportion of their income your employees should be spending on rent.

With rent as a multiplier, it's like they're suggesting 100% of your income goes to rent. It seems like a more reasonable way to take housing into account would be something like:

Salary = Base + Avg Rent

Using that formula, salary might be about $20k more for somebody in NYC than for somebody in Tucson. Using the actual calculator, it's $72k more ($117k vs $45k for senior level and average experience).