Numbeo lets one compare the cost of living between different cities. However, it makes a number of assumptions that appear to be inflexible. For example, my average spending pattern may differ considerably from the typical one. Also, in a huge city, 5 km from the core might still be considered city centre, but in a small city this would be considered to be outside. All in all, the figure "If you get X in city A, you need Y in city B" is likely inaccurate for me.
Is there any cost of living calculator that lets me assign weights to different categories? As I get around by bicycle, I can assign 0 weight to car and public transportation costs. Perhaps I spend less on restaurants, but more on internet. Et cetera.