$40K in St. Louis = $68,046 in San Diego
Your $40K salary in St. Louis (COL 87) has the same purchasing power as $68,046 in San Diego (COL 148). San Diego is more expensive — you'd need 70% more to maintain the same lifestyle.
Budget breakdown — $40K in both cities
What $40K actually buys you in each city after taxes and core expenses.
| Expense | St. Louis $40K | San Diego $40K (same salary) |
|---|---|---|
| Monthly take-home | $2,572 | $2,418 |
| 1BR rent | $1,300 | $2,600 |
| Groceries | $369 | $414 |
| Transport | $75 | $100 |
| Utilities | $162 | $130 |
| Internet | $60 | $65 |
| Left after essentials | $606/month | -$891/month |
Frequently asked questions
What is $40K in St. Louis equivalent to in San Diego?
$40K in St. Louis (COL index 87) has the same purchasing power as $68,046 in San Diego (COL index 148). That's 70% more than your current salary.
If I move from St. Louis to San Diego keeping my $40K salary, will I be better off?
Not necessarily. Core expenses in San Diego are higher, so on the same $40K salary you'd have $1,497 less per month. You'd need to earn $68,046 to maintain the same standard of living.
How is the salary equivalent calculated?
The equivalent salary is calculated by multiplying your current salary by the ratio of the two cities' overall cost of living indices: $40K × (148 ÷ 87) = $68,046. This adjusts for differences in housing, food, transport, and general cost of living.
Other salary amounts — St. Louis to San Diego
Equivalency uses overall COL index ratio. Take-home uses simplified federal/state brackets. Zillow · BLS · Numbeo · Q1 2026 · For general guidance only