$40K in Rapid City = $40,000 in Louisville
Your $40K salary in Rapid City (COL 88) has the same purchasing power as $40,000 in Louisville (COL 88). Louisville is more expensive — you'd need 0% 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 | Rapid City $40K | Louisville $40K (same salary) |
|---|---|---|
| Monthly take-home | $2,728 | $2,595 |
| 1BR rent | $1,200 | $1,300 |
| Groceries | $365 | $361 |
| Transport | $40 | $60 |
| Utilities | $148 | $162 |
| Internet | $65 | $60 |
| Left after essentials | $910/month | $652/month |
Frequently asked questions
What is $40K in Rapid City equivalent to in Louisville?
$40K in Rapid City (COL index 88) has the same purchasing power as $40,000 in Louisville (COL index 88). That's 0% less than your current salary.
If I move from Rapid City to Louisville keeping my $40K salary, will I be better off?
Not necessarily. Core expenses in Louisville are higher, so on the same $40K salary you'd have $258 less per month. You'd need to earn $40,000 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 × (88 ÷ 88) = $40,000. This adjusts for differences in housing, food, transport, and general cost of living.
Other salary amounts — Rapid City to Louisville
Equivalency uses overall COL index ratio. Take-home uses simplified federal/state brackets. Zillow · BLS · Numbeo · Q1 2026 · For general guidance only