What is an inflation calculator and how does it work?

An inflation calculator converts an amount of money from one date into its equivalent purchasing power at another date. It typically uses the Consumer Price Index (CPI), applying the ratio CPI(to)/CPI(from) to scale the amount.

Which CPI does the calculator use?

Most public calculators use CPI-U (Consumer Price Index for All Urban Consumers). Results can differ if you use CPI-W, core CPI (excluding food and energy), or PCE.

Does the calculator use monthly or annual data?

It generally uses monthly CPI values. Picking month and year allows more precise comparisons than annual averages.

Inflation Calculator

Calculate the purchasing power of US Dollar from 1913 to 2025 using historical CPI data

Enter Values

Amount ($)

From Date

To Date

Show CPI values

Show average annual inflation rate

Flat Rate Mode (Theoretical)

Results

Enter values and click Calculate to see results

How It Works

This inflation calculator uses historical Consumer Price Index (CPI-U) data to convert the purchasing power of the US dollar between different time periods.

Key Features:

Historical CPI Mode: Uses official CPI-U data from 1913 to present
Monthly Precision: Supports month and year selection for accurate comparisons
Flat Rate Mode: Theoretical scenarios using user-specified average inflation rates
Comprehensive Results: Shows adjusted amount, cumulative inflation, and average annual rates

Important Notes:

Results are based on CPI-U (Consumer Price Index for All Urban Consumers)
Does not account for regional price differences or individual spending patterns
Historical data only - does not predict future inflation
Results are for informational purposes and should not be considered financial advice

Frequently Asked Questions

Disclaimer

This tool is for informational purposes only. Results are based on CPI-U historical data and may not reflect individual circumstances or regional variations. Data may be subject to revisions. This calculator does not constitute financial advice. Please consult with financial professionals for investment or economic planning decisions.