Cost of Living Index Explained: What 73, 100 and 113 Mean

Check the source, reference year, geographical level, basket and base. Eurostat price-level indices compare national price levels; their construction uses purchasing power parities and nominal exchange rates. A household-consumption basket is not interchangeable with a GDP-wide measure or another site's city index.

In an illustrative series where the reference equals 100, A=73.3 is 26.7% below the reference, B=86.6 is 13.4% below, and C=113 is 13% above. None tells you the number of euros needed each month. Do not combine values based on EU=100 and New York=100 without a valid common basis.

Using only the hypothetical indices above: 113 ÷ 73.3 ≈ 1.542. C's basket is about 54.2% more expensive than A's, not 39.7% more expensive just because the indices differ by 39.7 points. In the reverse direction, 73.3 ÷ 113 ≈ 0.649: A is about 35.1% cheaper than C.

For B compared with A, 86.6 ÷ 73.3 ≈ 1.181. An €800 comparable spending basket would therefore produce a rough €945 estimate. This arithmetic is a scenario, not a promise that your purchases match the statistical basket.

A price-level comparison asks how prices compare between places for a particular period. Inflation asks how prices change over time within an economy. A change in a country's relative index is not its inflation rate: exchange rates, other countries' prices and methodological changes can affect the comparison.

A purchasing-power measure is not the exchange rate your bank offers. For your cash budget, translate actual expenses and take-home income into one chosen currency using a clearly dated planning rate and include payment costs separately. An index does not predict exchange rates.

A national overall index does not provide city-level rent, a short-term furnished lease or your neighbourhood's prices. The basket also weights categories differently from a particular household. Someone paying school fees or travelling frequently will not experience the national average in the same way as a single long-term renter.

Use a relevant category index only when its definition and base are comparable. For the three largest expense categories, prefer current local quotes: rent and mandatory charges, utilities, transport, food or healthcare as applicable. Add relocation costs and refundable deposits separately; a deposit ties up cash even when it is not a final expense.

Start with your existing category budget, apply a comparable ratio only to costs without better evidence, and replace the largest estimates with local quotes. Enter actual expected take-home income rather than assuming a national average wage is your job offer. An annual wage statistic divided by 12 may not reflect your household, tax position, pay schedule or median earnings.

For a hypothetical monthly plan, €945 everyday spending plus €900 rent, €120 utilities, €150 other obligations and €200 savings requires €2,315. Against €2,600 take-home income the margin is €285. A €200 rent increase reduces it to €85; a further €150 income drop creates a €65 shortfall. These are chosen scenario inputs, not local price observations.

Use the cost-of-living calculator with a consistent currency and inspect its dataset notes. A city label does not turn country-level data into observed city prices. Save a base and adverse scenario, and budget one-off moving costs and accessible emergency funds outside recurring spending.