$40K in Rapid City = $39,545 in Bismarck
Your $40K salary in Rapid City (COL 88) has the same purchasing power as $39,545 in Bismarck (COL 87). Bismarck is cheaper — your money goes 1% further there.
Budget breakdown — $40K in both cities
What $40K actually buys you in each city after taxes and core expenses.
| Expense | Rapid City $40K | Bismarck $40K (same salary) |
|---|---|---|
| Monthly take-home | $2,728 | $2,645 |
| 1BR rent | $1,200 | $1,150 |
| Groceries | $365 | $369 |
| Transport | $40 | $42 |
| Utilities | $148 | $152 |
| Internet | $65 | $65 |
| Left after essentials | $910/month | $867/month |
Frequently asked questions
What is $40K in Rapid City equivalent to in Bismarck?
$40K in Rapid City (COL index 88) has the same purchasing power as $39,545 in Bismarck (COL index 87). That's 1% less than your current salary.
If I move from Rapid City to Bismarck keeping my $40K salary, will I be better off?
Yes. If you keep earning $40K after moving to Bismarck, you'd have $-43 more per month after core expenses — because Bismarck is cheaper than Rapid City.
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 × (87 ÷ 88) = $39,545. This adjusts for differences in housing, food, transport, and general cost of living.
Other salary amounts — Rapid City to Bismarck
Equivalency uses overall COL index ratio. Take-home uses simplified federal/state brackets. Zillow · BLS · Numbeo · Q1 2026 · For general guidance only