$40K in Boulder = $26,667 in Louisville
Your $40K salary in Boulder (COL 132) has the same purchasing power as $26,667 in Louisville (COL 88). Louisville is cheaper — your money goes 33% further there.
Budget breakdown — $40K in both cities
What $40K actually buys you in each city after taxes and core expenses.
| Expense | Boulder $40K | Louisville $40K (same salary) |
|---|---|---|
| Monthly take-home | $2,582 | $2,595 |
| 1BR rent | $2,300 | $1,300 |
| Groceries | $414 | $361 |
| Transport | $80 | $60 |
| Utilities | $138 | $162 |
| Internet | $68 | $60 |
| Left after essentials | -$418/month | $652/month |
Frequently asked questions
What is $40K in Boulder equivalent to in Louisville?
$40K in Boulder (COL index 132) has the same purchasing power as $26,667 in Louisville (COL index 88). That's 33% less than your current salary.
If I move from Boulder to Louisville keeping my $40K salary, will I be better off?
Yes. If you keep earning $40K after moving to Louisville, you'd have $1,070 more per month after core expenses — because Louisville is cheaper than Boulder.
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 ÷ 132) = $26,667. This adjusts for differences in housing, food, transport, and general cost of living.
Other salary amounts — Boulder to Louisville
Equivalency uses overall COL index ratio. Take-home uses simplified federal/state brackets. Zillow · BLS · Numbeo · Q1 2026 · For general guidance only