$40K in San Diego = $23,784 in Louisville
Your $40K salary in San Diego (COL 148) has the same purchasing power as $23,784 in Louisville (COL 88). Louisville is cheaper — your money goes 41% further there.
Budget breakdown — $40K in both cities
What $40K actually buys you in each city after taxes and core expenses.
| Expense | San Diego $40K | Louisville $40K (same salary) |
|---|---|---|
| Monthly take-home | $2,418 | $2,595 |
| 1BR rent | $2,600 | $1,300 |
| Groceries | $414 | $361 |
| Transport | $100 | $60 |
| Utilities | $130 | $162 |
| Internet | $65 | $60 |
| Left after essentials | -$891/month | $652/month |
Frequently asked questions
What is $40K in San Diego equivalent to in Louisville?
$40K in San Diego (COL index 148) has the same purchasing power as $23,784 in Louisville (COL index 88). That's 41% less than your current salary.
If I move from San Diego to Louisville keeping my $40K salary, will I be better off?
Yes. If you keep earning $40K after moving to Louisville, you'd have $1,543 more per month after core expenses — because Louisville is cheaper than San Diego.
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 × (88 ÷ 148) = $23,784. This adjusts for differences in housing, food, transport, and general cost of living.
Other salary amounts — San Diego to Louisville
Equivalency uses overall COL index ratio. Take-home uses simplified federal/state brackets. Zillow · BLS · Numbeo · Q1 2026 · For general guidance only