Composite cost of living: -20.5% between San Diego and Chicago. Equivalent of $75,000 in San Diego: about $59,589 in Chicago. Housing alone moves -28.6%, the dominant driver per C2ER ACCRA's quarterly cost-of-living publication.
Multiply your San Diego salary by 0.795 (the index ratio 116/146) to get the Chicago number that preserves your real-terms spending. The three anchor rows below — $50k, $75k, $150k — are the most common comparison points for relocation offers.
| San Diego salary | Equivalent in Chicago | Difference |
|---|---|---|
| $50,000 | $39,726 | -$10,274 |
| $75,000 | $59,589 | -$15,411 |
| $150,000 | $119,178 | -$30,822 |
Five sub-indexes feed the composite cost-of-living number. Housing dominates, but the other four — groceries, transport, healthcare, utilities — each carry weight in any real household budget. Here is how San Diego and Chicago stack up category by category against the national-average baseline of 100.
| Category | San Diego | Chicago | Delta |
|---|---|---|---|
| Housing Rent + median home price | 185 | 132 | -28.6% |
| Groceries Supermarket basket | 107 | 100 | -6.5% |
| Transportation Fuel, transit, parking | 127 | 108 | -15.0% |
| Healthcare Doctor visits, prescriptions | 102 | 99 | -2.9% |
| Utilities Electric, gas, internet | 113 | 112 | -0.9% |
| Composite | 146 | 116 | -20.5% |
San Diego, CA and Chicago, IL sit on opposite ends of a cost-of-living spectrum that most U.S. relocators have to think through carefully. Chicago is roughly 21% cheaper on the composite index, with the housing sub-index alone running about 29% lower. Groceries and utilities follow the same direction with smaller magnitudes; healthcare costs are closer to parity than housing because medical pricing tracks insurance networks and provider density more than metro real-estate dynamics.
The decision frame is not "is Chicago cheaper" — that part is settled. The question is whether the income side of the equation changes proportionally. If you are taking a local Chicago job at Chicago market pay, the real-income comparison hinges on whether Chicago salary norms have kept pace with rent and price changes. If you are negotiating a remote move with your current San Diego employer, the question is what their geographic pay policy looks like and whether you can negotiate a smaller-than-default haircut.
Consumer-price indexes exclude income tax, so the equivalent-salary number above is a pre-tax comparison. Layered on top: California has a top-marginal or flat state income tax of 9.30%, while Illinois's is 4.95%. At a $75,000 salary, that translates to roughly $6,975 of state tax owed in California versus $3,713 in Illinois — a $3,263 difference that no consumer-price index captures.
Plug your real numbers into the take-home pay calculator to see the after-tax difference at your filing status and salary. Federal withholding is constant; the state side is what changes when you cross state lines. See the take-home pay calculator or the state-by-state take-home pay article for the precise after-tax number.
Per C2ER ACCRA's composite, no — Chicago runs at 116 against San Diego at 146, putting Chicago about 21% cheaper. Housing is the largest single contributor; groceries, transport, and utilities follow at smaller magnitudes.
The equivalent salary in Chicago is about $59,589. You get there by multiplying $75,000 by the index ratio (0.79, derived from 116 and 146). This is a consumer-price comparison; layer state tax separately for after-tax parity.
Housing — and it isn't close. San Diego's housing index is 185; Chicago's is 132. The remaining sub-indexes (groceries 107/100, transport 127/108, utilities 113/112) contribute, but the housing line is what produces the noticeable real-world budget difference.
State tax is separate from the cost-of-living index. The C2ER ACCRA composite covers consumer prices only; the sidebar on this page shows the California vs Illinois state-tax delta at three salary anchors. Add the two effects for the full after-tax comparison — they don't double-count.