$40K in Boulder = $32,424 in Chicago
Your $40K salary in Boulder (COL 132) has the same purchasing power as $32,424 in Chicago (COL 107). Chicago is cheaper — your money goes 19% further there.
Budget breakdown — $40K in both cities
What $40K actually buys you in each city after taxes and core expenses.
| Expense | Boulder $40K | Chicago $40K (same salary) |
|---|---|---|
| Monthly take-home | $2,582 | $2,565 |
| 1BR rent | $2,300 | $1,900 |
| Groceries | $414 | $388 |
| Transport | $80 | $105 |
| Utilities | $138 | $165 |
| Internet | $68 | $65 |
| Left after essentials | -$418/month | -$58/month |
Frequently asked questions
What is $40K in Boulder equivalent to in Chicago?
$40K in Boulder (COL index 132) has the same purchasing power as $32,424 in Chicago (COL index 107). That's 19% less than your current salary.
If I move from Boulder to Chicago keeping my $40K salary, will I be better off?
Yes. If you keep earning $40K after moving to Chicago, you'd have $360 more per month after core expenses — because Chicago 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 × (107 ÷ 132) = $32,424. This adjusts for differences in housing, food, transport, and general cost of living.
Other salary amounts — Boulder to Chicago
Equivalency uses overall COL index ratio. Take-home uses simplified federal/state brackets. Zillow · BLS · Numbeo · Q1 2026 · For general guidance only