Illinois Cost of Living Calculator (Purchasing Power & Relocation Index)

Moving a household budget into Illinois means scaling it by 92.4/100 (the state's composite cost-of-living index), which runs 7.6% below the U.S. average.

The housing index is the biggest single driver of that gap, at an index of 83.5, followed by utilities (93.4) and groceries (98.6).

Illinois is a Great Lakes and Midwest hub state and roughly mid-pack among Midwestern states; nationally it is in the more affordable lower third of state rankings, which is the figure compensation and relocation planners should anchor to rather than assuming the Midwest moves together as a block. Statewide averages like this one still smooth over real differences between Illinois's biggest metro area and its smaller towns.

For a $75,000 reference household, that's a swing of roughly $5,700 a year, and the housing index on its own is 16.5 points below the national 100.0 mark. MERIC compiles the composite quarterly from a wider basket than the three sub-indices listed here, adding transportation, healthcare, and miscellaneous goods and services categories not published separately by state.

Key Index Components for Illinois:

• Composite Benchmark Index: 92.4 (Rank #36)
• Housing Cost Index: 83.5
• Utilities Cost Index: 93.4
• Grocery Cost Index: 98.6

Illinois looks expensive from Chicago and reads cheap statewide. The composite is 92.4, rank 36 of 50, held down by a housing index of 83.5, while groceries at 98.6 and utilities at 93.4 are close to national. The calculator applies that statewide composite, which averages Chicago's market with downstate prices.

1. Baseline budget. You enter annual household spending priced at the national benchmark, index 100.0.
2. Composite lookup. Illinois's composite index of 92.4 is read from the 2026 MERIC state table, along with its rank of #36 among the 50 states.
3. Single-factor scaling. The baseline is multiplied by 92.4 and divided by 100. Housing 83.5, groceries 98.6 and utilities 93.4 are reported for context rather than weighted separately, because the composite already carries MERIC's weights. The statewide housing figure of 83.5 is the number to be most careful with in Illinois: it is a blend that no single Chicago-area household actually experiences.
4. Differential. The dollar and percentage difference against the baseline is taken from the scaled result, which is what the headline output and the monthly view report.

Using this calculator's baseline scenario: a household needing $75,000.00 a year to sustain a standard basket of goods (housing, groceries, utilities, transportation, and healthcare), priced at the U.S. national average (composite index 100.0).

1. National baseline. $75,000.00 is the reference spending level at the national-average price level (index 100.0).
2. Apply Illinois's composite index. Illinois's composite index of 92.4 (rank #36 nationally) means local prices run 7.6% below the national basket. Scaling: $75,000.00 × (92.4 ÷ 100) = $69,300.00.
3. Dollar differential. $69,300.00 − $75,000.00 = -$5,700.00, so a household living in Illinois needs its budget to shrink by that amount to match the same standard of living.
4. Percentage and monthly view. That is -7.6% of the baseline, or $5,775.00/mo in Illinois versus $6,250.00/mo nationally.

Illinois runs meaningfully cheaper than the national baseline, with housing costs (index 83.5, 16.5 points below average) the largest single driver of the gap.

Illinois carries a composite index of 92.4, ranking 36th of fifty, and the engine applies that single figure to your whole budget in one multiplication. There is no threshold and nothing steps, so the marginal and reverse readings below are what the sweep supports.

The marginal figure. Each additional $1,000 of national-baseline spending costs $924.00 in Illinois, a $76.00 saving per thousand against the national line. The engine returns $70,224.00 on a $76,000 baseline against $69,300.00 on $75,000. At the $120,000 family scenario the result is $110,880.00, a $9,120.00 annual saving.

The reverse question. A household spending $75,000 a year in Illinois is living a national-average lifestyle costing $81,168.83: enter that figure and the engine returns exactly $75,000.00 of Illinois-adjusted cost. Read as a relocation question, a job offer that has to sustain a $75,000 Illinois standard of living elsewhere in the country needs to be worth $6,168.83 more.

The addition error, priced. Adding the 7.6% discount back to the $69,300.00 Illinois figure gives $74,566.80. Run that through the engine and it returns $68,899.72, $400.28 below the $69,300.00 you started from. Reversing a multiplication by 0.924 requires dividing by 0.924.

One index, applied to everything. The engine multiplies your budget by 92.4 and divides by 100. It does not weight housing, groceries and utilities separately, and the 83.5 housing index, the 98.6 grocery index and the 93.4 utilities index on this page are applied to nothing in your result. The Illinois discount is almost entirely a shelter discount, and a household that has already bought its home captures little of it, but this calculator has no way to represent that.

What the composite excludes, which is unusually important in Illinois. The index prices goods and services, not taxes. Illinois carries the highest average effective property tax rate in the country at 1.92% and a 9.50% combined corporate rate, and neither is in the 92.4. A household reading this page as a total cost comparison against a higher-index, lower-tax state will get the wrong answer, and nothing on this page can correct for it.

The tier table, and what each row actually is. The twelve rows hold the index steady at the composite 92.4 and vary only the budget, so the schedule is one series read straight down. Row i prices budget × i ÷ 6, which at the default $75,000 baseline means $12,500.00 steps: row 1 returns $11,550.00 on $12,500.00, row 4 returns $46,200.00 on $50,000.00, row 8 returns $92,400.00 on $100,000.00, row 12 returns $138,600.00 on $150,000.00. Row 6 sits on the $75,000.00 you entered and returns $69,300.00, identical to the headline.

The difference column is a fixed share of the row. Every row's saving is 7.6% of that row's tier: -$950.00 at row 1, -$3,800.00 at row 4, -$5,700.00 at row 6, -$11,400.00 at row 12. Because both columns scale with the budget, the table has no crossover point and no row where the Illinois discount is proportionally larger or smaller than any other. A household at double the budget saves exactly double.

The sub-indices stay out of the arithmetic. Housing 83.5, groceries 98.6 and utilities 93.4 appear on this page as an explanation of the composite's composition and nowhere else. No row of the schedule prices a budget at any of them, and no output blends them into a weighted figure.

• Intra-state variance between major metropolitan urban centers and rural counties within Illinois.
• Discretionary lifestyle choices, private schooling, and luxury expenditures.
• State income and property tax impacts on disposable take-home salary.
• Dynamic seasonal utility price surges during peak winter heating or summer cooling months.

• Comparing State Averages Instead of Metro Areas: Living in a major metro area is often 20%-40% more expensive than the statewide average.
• Focusing Solely on Housing: Overlooking higher utility, transportation, or food costs in colder or remote regions.
• Ignoring Net Take-Home Pay: Comparing gross salary without factoring in state income and sales tax differentials.
• Failing to Adjust for Family Size: Larger households experience disproportionately higher grocery and healthcare expenditures.

• U.S. Bureau of Economic Analysis (BEA): Regional Price Parities. bea.gov/data/prices-inflation/regional-price-parities-state-and-metro-area
• U.S. Bureau of Labor Statistics (BLS): Consumer Expenditure Survey. bls.gov/cex
• Illinois Department of Revenue, the official state tax authority for Illinois rates, rules and forms. tax.illinois.gov

Also consulted: MERIC: Cost of Living Data Series (2025/2026).