$100K in Charleston = $90,722 in Rapid City
Your $100K salary in Charleston (COL 97) has the same purchasing power as $90,722 in Rapid City (COL 88). Rapid City is cheaper — your money goes 9% further there.
Budget breakdown — $100K in both cities
What $100K actually buys you in each city after taxes and core expenses.
| Expense | Charleston $100K | Rapid City $100K (same salary) |
|---|---|---|
| Monthly take-home | $5,804 | $6,321 |
| 1BR rent | $1,900 | $1,200 |
| Groceries | $376 | $365 |
| Transport | $55 | $40 |
| Utilities | $162 | $148 |
| Internet | $63 | $65 |
| Left after essentials | $3,248/month | $4,503/month |
Frequently asked questions
What is $100K in Charleston equivalent to in Rapid City?
$100K in Charleston (COL index 97) has the same purchasing power as $90,722 in Rapid City (COL index 88). That's 9% less than your current salary.
If I move from Charleston to Rapid City keeping my $100K salary, will I be better off?
Yes. If you keep earning $100K after moving to Rapid City, you'd have $1,255 more per month after core expenses — because Rapid City is cheaper than Charleston.
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: $100K × (88 ÷ 97) = $90,722. This adjusts for differences in housing, food, transport, and general cost of living.
Other salary amounts — Charleston to Rapid City
Equivalency uses overall COL index ratio. Take-home uses simplified federal/state brackets. Zillow · BLS · Numbeo · Q1 2026 · For general guidance only