What does a Biological Science Teachers, Postsecondary salary really buy you in Illinois?
Illinois is near the US average cost of livingData: BLS OEWS 2024 + BEA Regional Price Parities 2022 • Updated 2026-03-31
Illinois's Regional Price Parity (RPP) is 101.3, meaning prices are 1.3% higher the national average. A Biological Science Teachers, Postsecondary earning $83,580 in Illinois has the equivalent purchasing power of $82,507 in an average-cost US state.
Every dollar goes further in low-cost states. Here is how each salary percentile compares after adjusting for Illinois's cost of living.
| Percentile | Nominal Salary | COL-Adjusted | Difference |
|---|---|---|---|
| 10th Percentile (P10) | $39,990 | $39,476 | $-513 |
| 25th Percentile (P25) | $60,480 | $59,703 | $-776 |
| Median (P50) | $83,580 | $82,507 | $-1,072 |
| 75th Percentile (P75) | $102,400 | $101,085 | $-1,314 |
| 90th Percentile (P90) | $137,570 | $135,804 | $-1,765 |
Illinois's cost of living is close to the national average, so $83,580 keeps most of its value at $82,507 in real terms. Location choice here is more about career opportunities than cost arbitrage.
Where does Biological Science Teachers, Postsecondary salary stretch the furthest? Top 10 states ranked by COL-adjusted median salary.
Illinois ranks #32 out of 50 states for Biological Science Teachers, Postsecondary after cost-of-living adjustment.
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A Biological Science Teachers, Postsecondary in Illinois earns a median salary of $83,580 per year. After adjusting for Illinois's cost of living (RPP=101.3), the real purchasing power is $82,507 — a -1.3% difference.
Illinois's cost of living is 1.3% higher than the national average according to the BEA Regional Price Parities (2022). The RPP index for Illinois is 101.3 (US average = 100).
Regional Price Parities (RPPs) are price indexes published by the U.S. Bureau of Economic Analysis (BEA) that measure differences in price levels across states. They are expressed as a percentage of the national average (US = 100). Higher RPP means higher cost of living.
The adjusted salary is calculated as: Nominal Salary x (100 / RPP). For a Biological Science Teachers, Postsecondary in Illinois: $83,580 x (100 / 101.3) = $82,507. This represents what the salary would be worth in a state with average living costs.