$40K in Boston = $36,543 in San Diego
Your $40K salary in Boston (COL 162) has the same purchasing power as $36,543 in San Diego (COL 148). San Diego is cheaper — your money goes 9% further there.
Budget breakdown — $40K in both cities
What $40K actually buys you in each city after taxes and core expenses.
| Expense | Boston $40K | San Diego $40K (same salary) |
|---|---|---|
| Monthly take-home | $2,562 | $2,418 |
| 1BR rent | $3,000 | $2,600 |
| Groceries | $418 | $414 |
| Transport | $90 | $100 |
| Utilities | $185 | $130 |
| Internet | $70 | $65 |
| Left after essentials | -$1,201/month | -$891/month |
Frequently asked questions
What is $40K in Boston equivalent to in San Diego?
$40K in Boston (COL index 162) has the same purchasing power as $36,543 in San Diego (COL index 148). That's 9% less than your current salary.
If I move from Boston to San Diego keeping my $40K salary, will I be better off?
Yes. If you keep earning $40K after moving to San Diego, you'd have $310 more per month after core expenses — because San Diego is cheaper than Boston.
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 × (148 ÷ 162) = $36,543. This adjusts for differences in housing, food, transport, and general cost of living.
Other salary amounts — Boston to San Diego
Equivalency uses overall COL index ratio. Take-home uses simplified federal/state brackets. Zillow · BLS · Numbeo · Q1 2026 · For general guidance only