$120K in Erie = $142,857 in Naperville
Your $120K salary in Erie (COL 84) has the same purchasing power as $142,857 in Naperville (COL 100). Naperville is more expensive — you'd need 19% 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 | Erie $120K | Naperville $120K (same salary) |
|---|---|---|
| Monthly take-home | $6,845 | $6,655 |
| 1BR rent | $1,100 | $1,650 |
| Groceries | $365 | $380 |
| Transport | $60 | $72 |
| Utilities | $168 | $158 |
| Internet | $62 | $62 |
| Left after essentials | $5,090/month | $4,333/month |
Frequently asked questions
What is $120K in Erie equivalent to in Naperville?
$120K in Erie (COL index 84) has the same purchasing power as $142,857 in Naperville (COL index 100). That's 19% more than your current salary.
If I move from Erie to Naperville keeping my $120K salary, will I be better off?
Not necessarily. Core expenses in Naperville are higher, so on the same $120K salary you'd have $757 less per month. You'd need to earn $142,857 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 × (100 ÷ 84) = $142,857. This adjusts for differences in housing, food, transport, and general cost of living.
Other salary amounts — Erie to Naperville
Equivalency uses overall COL index ratio. Take-home uses simplified federal/state brackets. Zillow · BLS · Numbeo · Q1 2026 · For general guidance only