How the adjustment works
The calculator uses the standard CPI ratio method: adjusted amount = original amount x target CPI / original CPI. If the target index is higher, the adjusted amount is higher because prices rose relative to the original period.
Example
If an amount is 100, the original index is 100 and the target index is 125, the adjusted amount is 125. That means the target-period price level is 25% higher than the original-period price level.
Assumptions and limitations
CPI and HICP are aggregate price measures. They may not match a specific household, country, city or spending pattern. Use official CPI/HICP series for the region you are studying, and check the source date before relying on the result.
References
- U.S. Bureau of Labor Statistics: Consumer Price Index, accessed 2026-05-13.
- World Bank: Inflation, consumer prices, accessed 2026-05-13.
- Eurostat: Harmonised Index of Consumer Prices, accessed 2026-05-13.
Last reviewed: 2026-05-14