Inflation calculator and purchasing power

Compare money across years using official World Bank/IMF CPI data. Choose a country and available years to calculate cumulative inflation and purchasing power.

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Set your data

Calculation country

Starting amount

Starting year

Ending year

Annual averages, not December values or monthly data. No currency conversion. Years before the current monetary unit are excluded; this is not a statutory rent or benefit adjustment.

Compares annual average CPI from World Bank/IMF (2010 = 100), in the same currency. Only available years can be selected; no forecasts or statutory adjustments. CC BY 4.0.

World Bank / IMF: The latest update failed. Calculations use the last verified data: check the date and validity period.
Source last checked: November 12, 2026 4:10 AM · Rome time

Result

Enter your inputs and calculate.

Applied formula

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How to use the tool

Select a country, amount and two available years.
The result uses the selected country’s currency.

Method and principles

Equivalent amount = amount × ending index / starting index.

Price change = (ending index / starting index − 1) × 100.

Unchanged money’s purchasing power uses the inverse ratio.

Compare annual averages from the same national series.

CPI is not a substitute for a specific index required by a contract or law.

Formula

V₂ = V₁ \times \frac{CPI₂}{CPI₁}

Formula and limits

Annual averages, not December values or monthly data. No currency conversion. Years before the current monetary unit are excluded; this is not a statutory rent or benefit adjustment.

Example

With indices of 100 and 125, 1000 becomes 1250 in equivalent purchasing power: prices rose 25%. An unchanged 1000 buys the equivalent of 800 at starting prices.

Practical example

Input

Calculation country: United States
Starting amount: 1000
Starting year: 2020
Ending year: 2024

Result

$1,212.04

Equivalent amount = amount × ending index / starting index. Price change = (ending index / starting index − 1) × 100. Unchanged money’s purchasing power uses the inverse ratio.

Result details

Result details
Parameter	Value
Calculation country	United States
Data period	2020 → 2024
Cumulative price change	21.2%
Purchasing power of the unchanged amount, in starting-year prices	$825.06
Starting index	118.6905
Ending index	143.8573

Limits and checks

Limits and checks
Parameter	Value
Starting amount	≥ 0; ≤ 1000000000000

Sources

World Bank / IMF — Consumer price index (2010 = 100), CC BY 4.0

Frequently asked questions

Why is the current year unavailable?

Only published annual averages are used. Coverage depends on country and source; missing years are not extrapolated.

Where are my inputs processed?

Calculations run in your browser. Entered amounts are not sent to the server.