$100K in Lafayette = $102,353 in St. Louis
Your $100K salary in Lafayette (COL 85) has the same purchasing power as $102,353 in St. Louis (COL 87). St. Louis is more expensive — you'd need 2% more to maintain the same lifestyle.
Budget breakdown — $100K in both cities
What $100K actually buys you in each city after taxes and core expenses.
| Expense | Lafayette $100K | St. Louis $100K (same salary) |
|---|---|---|
| Monthly take-home | $5,963 | $5,929 |
| 1BR rent | $1,100 | $1,300 |
| Groceries | $361 | $369 |
| Transport | $42 | $75 |
| Utilities | $208 | $162 |
| Internet | $58 | $60 |
| Left after essentials | $4,194/month | $3,963/month |
Frequently asked questions
What is $100K in Lafayette equivalent to in St. Louis?
$100K in Lafayette (COL index 85) has the same purchasing power as $102,353 in St. Louis (COL index 87). That's 2% more than your current salary.
If I move from Lafayette to St. Louis keeping my $100K salary, will I be better off?
Not necessarily. Core expenses in St. Louis are higher, so on the same $100K salary you'd have $231 less per month. You'd need to earn $102,353 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: $100K × (87 ÷ 85) = $102,353. This adjusts for differences in housing, food, transport, and general cost of living.
Other salary amounts — Lafayette to St. Louis
Equivalency uses overall COL index ratio. Take-home uses simplified federal/state brackets. Zillow · BLS · Numbeo · Q1 2026 · For general guidance only