$120K in Montgomery = $121,481 in Rockford
Your $120K salary in Montgomery (COL 81) has the same purchasing power as $121,481 in Rockford (COL 82). Rockford is more expensive — you'd need 1% more to maintain the same lifestyle.
Budget breakdown — $120K in both cities
What $120K actually buys you in each city after taxes and core expenses.
| Expense | Montgomery $120K | Rockford $120K (same salary) |
|---|---|---|
| Monthly take-home | $6,655 | $6,655 |
| 1BR rent | $1,050 | $1,050 |
| Groceries | $353 | $357 |
| Transport | $38 | $50 |
| Utilities | $170 | $158 |
| Internet | $58 | $58 |
| Left after essentials | $4,986/month | $4,982/month |
Frequently asked questions
What is $120K in Montgomery equivalent to in Rockford?
$120K in Montgomery (COL index 81) has the same purchasing power as $121,481 in Rockford (COL index 82). That's 1% more than your current salary.
If I move from Montgomery to Rockford keeping my $120K salary, will I be better off?
Not necessarily. Core expenses in Rockford are higher, so on the same $120K salary you'd have $4 less per month. You'd need to earn $121,481 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: $120K × (82 ÷ 81) = $121,481. This adjusts for differences in housing, food, transport, and general cost of living.
Other salary amounts — Montgomery to Rockford
Equivalency uses overall COL index ratio. Take-home uses simplified federal/state brackets. Zillow · BLS · Numbeo · Q1 2026 · For general guidance only