What approximately equates with 100k TC (Base+Yearly Bonus all cash) in the West Coast?
The west coast is a bit broad. Are we talking San Diego? LA? Bay Area? Sacramento? Portland? Seattle? Tacoma?
Seattle and Bay Area specifically
Probably double for SFBA and somewhere in between for SEA, like 160-175k. Easiest way to compare is look up apartments where you'd live and see how the COL increases from current. There are also numerous quality COL calc websites you can Google and get your answer in minutes
https://www.numbeo.com/cost-of-living/compare_cities.jsp?country1=United+States&city1=Atlanta%2C+GA&country2=United+States&city2=San+Francisco%2C+CA