It's best to simply look at it relative to expenses. If you want to retire in HCOL, you could do it in the same amount of time as someone in LCOL if you save th

It's best to simply look at it relative to expenses. If you want to retire in HCOL, you could do it in the same amount of time as someone in LCOL if you save the same % of your income. If you want to move to LCOL, estimate the expenses there. I don't know of strict rule of percentage or nominal dollars that works except for using annual expenses as the measuring stick.