usefulweb.site Inflation Time Machine

Money-saving & comparison

Inflation Time Machine

What was money from one year worth in another? CPI-based, 20 countries, World Bank data.

Label only. Use the currency of the chosen country; no conversion is done.

Try an example: 100 EUR in Germany, 2000 → 2024 · 1,000 USD in the US, 1980 → 2024

How it works

Convert an amount between years with the consumer price index (2010 = 100) published by the World Bank. Shows the equivalent value, cumulative inflation, average annual inflation and lost purchasing power, with a year-by-year table.

  • Data: World Bank WDI indicator FP.CPI.TOTL, consumer price index (2010 = 100), annual averages, snapshot stored with retrieval date.
  • Equivalent value = amount × CPI(to year) ÷ CPI(from year).
  • Cumulative inflation = (CPI(later) ÷ CPI(earlier) − 1) × 100.
  • Average annual inflation (CAGR) = ((CPI(later) ÷ CPI(earlier))^(1 ÷ years) − 1) × 100.
  • Purchasing power loss = (1 − CPI(earlier) ÷ CPI(later)) × 100: how much less the same nominal amount buys in the later year.
  • Because CPI values are annual averages, results compare average price levels of whole years, not specific dates.

Sources

For scripts and AI agents

  • JSON API: POST https://inflationtimemachine.usefulweb.site/api/v1/calculate (same calculation as this page)
  • Interface description: OpenAPI 3.1 · AI guide: llms.txt
  • MCP server (Streamable HTTP): https://inflationtimemachine.usefulweb.site/mcp · tool name inflation_time_machine
Example request
curl -s -X POST https://inflationtimemachine.usefulweb.site/api/v1/calculate \
  -H 'content-type: application/json' \
  -d '{"amount":100,"currency":"EUR","fromYear":2000,"toYear":2024,"country":"DE"}'
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