$40K in Koh Samui = $81,600 in Durham
Your $40K salary in Koh Samui (COL 50) has the same purchasing power as $81,600 in Durham (COL 102). Durham is more expensive — you'd need 104% more to maintain the same lifestyle.
Budget breakdown — $40K in both cities
What $40K actually buys you in each city after taxes and core expenses.
| Expense | Koh Samui $40K | Durham $40K (same salary) |
|---|---|---|
| Monthly take-home | $2,728 | $2,578 |
| 1BR rent | $620 | $1,750 |
| Groceries | $380 | $372 |
| Transport | $150 | $82 |
| Utilities | $70 | $155 |
| Internet | $28 | $62 |
| Left after essentials | $1,480/month | $157/month |
Frequently asked questions
What is $40K in Koh Samui equivalent to in Durham?
$40K in Koh Samui (COL index 50) has the same purchasing power as $81,600 in Durham (COL index 102). That's 104% more than your current salary.
If I move from Koh Samui to Durham keeping my $40K salary, will I be better off?
Not necessarily. Core expenses in Durham are higher, so on the same $40K salary you'd have $1,323 less per month. You'd need to earn $81,600 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: $40K × (102 ÷ 50) = $81,600. This adjusts for differences in housing, food, transport, and general cost of living.
Other salary amounts — Koh Samui to Durham
Equivalency uses overall COL index ratio. Take-home uses simplified federal/state brackets. Zillow · BLS · Numbeo · Q1 2026 · For general guidance only