$40K in Durham = $32,157 in Rockford
Your $40K salary in Durham (COL 102) has the same purchasing power as $32,157 in Rockford (COL 82). Rockford is cheaper — your money goes 20% further there.
Budget breakdown — $40K in both cities
What $40K actually buys you in each city after taxes and core expenses.
| Expense | Durham $40K | Rockford $40K (same salary) |
|---|---|---|
| Monthly take-home | $2,578 | $2,562 |
| 1BR rent | $1,750 | $1,050 |
| Groceries | $372 | $357 |
| Transport | $82 | $50 |
| Utilities | $155 | $158 |
| Internet | $62 | $58 |
| Left after essentials | $157/month | $889/month |
Frequently asked questions
What is $40K in Durham equivalent to in Rockford?
$40K in Durham (COL index 102) has the same purchasing power as $32,157 in Rockford (COL index 82). That's 20% less than your current salary.
If I move from Durham to Rockford keeping my $40K salary, will I be better off?
Yes. If you keep earning $40K after moving to Rockford, you'd have $732 more per month after core expenses — because Rockford is cheaper than Durham.
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 × (82 ÷ 102) = $32,157. This adjusts for differences in housing, food, transport, and general cost of living.
Other salary amounts — Durham to Rockford
Equivalency uses overall COL index ratio. Take-home uses simplified federal/state brackets. Zillow · BLS · Numbeo · Q1 2026 · For general guidance only