Overall
- Helena
- 95.7
Diff -16.2 RPP
San Diego-Chula Vista-Carlsbad vs Helena
Cost of living comparison based on BEA Regional Price Parities. Helena is 14.5% less expensive than San Diego-Chula Vista-Carlsbad.
14.5% less expensive
Helena, MT is 14.5% less expensive than San Diego-Chula Vista-Carlsbad, CA on BEA Regional Price Parities (overall RPP 95.7 vs 111.9). A $100,000 salary in San Diego-Chula Vista-Carlsbad buys about the same as $85,510 in Helena; the largest component gap is services.
- Overall RPP 111.9 (San Diego-Chula Vista-Carlsbad) vs 95.7 (Helena)
- $100k in San Diego-Chula Vista-Carlsbad ≈ $85,510 purchasing power in Helena
- Services drives the gap (-101.6 RPP points)
RPP parity plate
Pair CA:MT 111.9→95.7
TIER-GAP · CROSS-STATE · SERVICES-LED · BENCH-CROSS · PP-SHIFT
- TIER-GAP Clear tier gap
- CROSS-STATE CA × MT
- SERVICES-LED Services-led gap
- BENCH-CROSS Benchmark cross
- PP-SHIFT PP shift
Instrument codes from this pair's BEA Regional Price Parities (overall · goods · services · rents · national benchmark 100 · purchasing-power conversion), not a ranking or recommendation.
What This Comparison Actually Tells You
San Diego-Chula Vista-Carlsbad, CA and Helena, MT sit in clearly different price tiers, separated by 16.2 RPP points. At this distance, treating the same nominal salary as equivalent would materially change purchasing power.
This route crosses the national benchmark: San Diego-Chula Vista-Carlsbad is above 100 while Helena is below it. That makes the move a change of price regime, not merely a rank swap.
Services leads the difference, with Helena 101.6 points lower than San Diego-Chula Vista-Carlsbad. Goods, services, and rents all point in the same broad direction, making the headline comparison more transferable across household types.
Comparable population context is incomplete for this pair, so no market-scale explanation is inferred from the price indexes.
For a service-heavy household, test childcare, health, and other locally supplied costs before relying on rent alone. The BEA ratio converts $100,000 in San Diego-Chula Vista-Carlsbad to $85,510 in Helena, but it is not a personal spending weight.
How the Price Gap Changed
San Diego-Chula Vista-Carlsbad and Helena share 17 published annual releases from 2008 through 2024. Their overall gap narrowed, moving from 17.7 to 16.2 RPP points. San Diego-Chula Vista-Carlsbad remained the higher-index metro in the latest release.
Services changed the most within this pair: its gap moved 53.4 points between the first and latest shared releases (48.2 to 101.6 points). This describes a relative price-index history, not a forecast or a household budget.
| Release Year | San Diego-Chula Vista-Carlsbad RPP | Helena RPP | Relative Gap |
|---|---|---|---|
| 2008 | 113.7 | 96.0 | 17.7 points San Diego-Chula Vista-Carlsbad higher |
| 2012 | 112.9 | 92.0 | 20.9 points San Diego-Chula Vista-Carlsbad higher |
| 2016 | 113.6 | 95.6 | 18.0 points San Diego-Chula Vista-Carlsbad higher |
| 2020 | 115.1 | 92.0 | 23.1 points San Diego-Chula Vista-Carlsbad higher |
| 2024 | 111.9 | 95.7 | 16.2 points San Diego-Chula Vista-Carlsbad higher |
Annual BEA Regional Price Parity releases; a higher index means a higher price level relative to the national average of 100. Selected years shown from the full shared series.
Category Breakdown
Goods
- Helena
- 96.0
Diff -12.0 RPP
Services
- Helena
- 72.6
Diff -101.6 RPP
Rents
- Helena
- 90.1
Diff -89.1 RPP
| Category | San Diego-Chula Vista-Carlsbad | Helena | Difference |
|---|---|---|---|
| Overall | 111.9 | 95.7 | -16.2 |
| Goods | 108.0 | 96.0 | -12.0 |
| Services | 174.2 | 72.6 | -101.6 |
| Rents | 179.3 | 90.1 | -89.1 |
Visual Comparison
Overall
San Diego-Chula Vista-Carlsbad 111.9
Helena 95.7
Goods
San Diego-Chula Vista-Carlsbad 108.0
Helena 96.0
Services
San Diego-Chula Vista-Carlsbad 174.2
Helena 72.6
Rents
San Diego-Chula Vista-Carlsbad 179.3
Helena 90.1
Vertical line = national average (100)
Salary Equivalents
What a salary in San Diego-Chula Vista-Carlsbad would need to be in Helena for the same purchasing power:
| In San Diego-Chula Vista-Carlsbad | In Helena | Difference |
|---|---|---|
| $50,000 | $42,755 | $-7,245 |
| $75,000 | $64,133 | $-10,867 |
| $100,000 | $85,510 | $-14,490 |
| $150,000 | $128,266 | $-21,734 |
$ in San Diego-Chula Vista-Carlsbad = in Helena
Same BEA Regional Price Parity ratio as the table above (111.9 → 95.7), computed live from your number, nothing is sent anywhere.
San Diego-Chula Vista-Carlsbad
111.9
Cost Index
Helena
95.7
Cost Index
Frequently Asked Questions
Is Helena more expensive than San Diego-Chula Vista-Carlsbad?
Helena is 14.5% less expensive than San Diego-Chula Vista-Carlsbad. The overall cost index is 95.7 vs 111.9 (national average = 100).
What salary in Helena equals $100K in San Diego-Chula Vista-Carlsbad?
A $100,000 salary in San Diego-Chula Vista-Carlsbad has the same purchasing power as $85,510 in Helena. This is based on the BEA Regional Price Parity indexes.
How do rents compare between San Diego-Chula Vista-Carlsbad and Helena?
Rents in San Diego-Chula Vista-Carlsbad are indexed at 179.3 while Helena is at 90.1 (national average = 100). San Diego-Chula Vista-Carlsbad has higher rents.
Data sources
- BEA Regional Price Parities (RPP), the cost-of-living indices shown on this page
- U.S. Census Bureau, American Community Survey (ACS), gross-rent observations behind the rents component
- BLS Consumer Price Index (CPI), goods and services price relatives
- BLS Occupational Employment and Wage Statistics (OEWS), labor-driven services component
- HUD Fair Market Rents (FMR), 40th-percentile rent cross-reference
Every figure on PlainCost is rendered directly from BEA Regional Price Parity source data, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, our changelog, or report a data error. Data current as of 2026-08-11. Rankings measure the published cost-of-living index only; we don't recommend where to live or rate any metro's quality of life.