$120K in Idaho Falls = $182,069 in Boulder
Your $120K salary in Idaho Falls (COL 87) has the same purchasing power as $182,069 in Boulder (COL 132). Boulder is more expensive — you'd need 52% 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 | Idaho Falls $120K | Boulder $120K (same salary) |
|---|---|---|
| Monthly take-home | $6,575 | $6,715 |
| 1BR rent | $1,100 | $2,300 |
| Groceries | $365 | $414 |
| Transport | $35 | $80 |
| Utilities | $142 | $138 |
| Internet | $65 | $68 |
| Left after essentials | $4,868/month | $3,715/month |
Frequently asked questions
What is $120K in Idaho Falls equivalent to in Boulder?
$120K in Idaho Falls (COL index 87) has the same purchasing power as $182,069 in Boulder (COL index 132). That's 52% more than your current salary.
If I move from Idaho Falls to Boulder keeping my $120K salary, will I be better off?
Not necessarily. Core expenses in Boulder are higher, so on the same $120K salary you'd have $1,153 less per month. You'd need to earn $182,069 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 × (132 ÷ 87) = $182,069. This adjusts for differences in housing, food, transport, and general cost of living.
Other salary amounts — Idaho Falls to Boulder
Equivalency uses overall COL index ratio. Take-home uses simplified federal/state brackets. Zillow · BLS · Numbeo · Q1 2026 · For general guidance only