Cost of Living Index (COL Index)

How It Works

The cost of living index is essential for comparing salaries across cities. A $100,000 salary in San Francisco (COL ~180) has roughly the same purchasing power as a $56,000 salary in a city with a COL of 100. The index is typically calculated using weighted categories: housing (30-40% of the index, and the biggest driver of variation), food (15%), transportation (10%), healthcare (8%), utilities (8%), and miscellaneous goods and services. CORI (the Council for Community and Economic Research) produces the most widely used COL index, surveying prices in 300+ urban areas quarterly. Key examples: New York City COL ~187 (87% above average), San Francisco ~180, Boston ~152, Austin ~103, Dallas ~96, Memphis ~87. Housing drives the vast majority of variation — grocery and transportation costs differ by 10-20% between cities, while housing costs can differ by 300-400%. SalaryTruth includes COL index data for every city so you can compare real purchasing power, not just nominal salary numbers. A role paying $90,000 in Dallas (COL ~96) often provides a higher standard of living than the same role paying $130,000 in San Francisco (COL ~180).

Related Terms

• Purchasing Power — The real value of your salary after adjusting for local cost of living — what your income can actually buy in terms of housing, food, and services.
• Geographic Pay Differential — The difference in salary for the same job in different cities — reflecting local cost of living, labor supply and demand, state taxes, and industry concentration.