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Consumer Price Index (CPI) Calculator to Calculate the Effects of Inflation Over Time

Calculator Preferences
CPI Inflation Calculator Sign
CPI Inflation Calculator

This calculator will calculate the effects of inflation or deflation on a past, present, or future dollar amount. For past calculations the calculator uses the actual US Consumer Price Index, while future calculations are based on your own expected inflation rate. Includes a printer friendly year-by-year report feature for all calculated results. The Learn tab includes:

  • What is CPI?
  • Why is the inflation rate important?
  • What causes the CPI to rise or fall?
Learn More

Selected Data Record:

A Data Record is a set of calculator entries that are stored in your web browser's Local Storage. If a Data Record is currently selected in the "Data" tab, this line will list the name you gave to that data record. If no data record is selected, or you have no entries stored for this calculator, the line will display "None".

DataData recordData recordSelected data record: None
Start amount:Start amount:Dollar amount for start year:Dollar amount for start year:

Dollar amount for start year:

Enter a dollar amount to begin calculating the effects of inflation or deflation on (without the dollar sign or any commas). This amount should coincide with the year you enter on the next line.

Start year:Start year:Start year:Start year:

Start year (4-digit #):

Enter the year that corresponds to the amount entered in the line above. Note that the start year can be a past, present, or future year, but cannot be earlier than 1913.

End year:End year:End year:End year:

End year (4-digit #):

Enter the year you would like the calculations to stop at. Note that the CPI Calculator will only allow years from 1913 on up, and all calculations beyond 2017 will be forecasted based on your entry on the next line.

Future rate:Future rate:Expected future average inflation rate:Expected future average inflation rate:

Expected future average inflation rate:

Enter the average annual rate of inflation you expect will occur for future years (without the percent sign). This figure will only be used if the time period involves any years beyond 2017.

End worth:End worth:Ending relative buying power:Ending relative buying power:

Ending relative buying power:

This amount is the ending relative buying power of the dollar amount entered after accounting for inflation from the start year to the end year. If the time period involves years later than 2017, a portion of this result is based on your future inflation rate entry.

Dollar chg:Dollar CPI change:Dollar change in CPI:Dollar change in CPI:

Dollar change in CPI:

This result represents the dollar amount difference between the starting buying power and the ending buying power. Note that a negative number indicates deflation, which is usually the result of the starting year being later than the ending year.

Percent chg:Percent CPI change:Percentage change in CPI:Percentage change in CPI:

Percentage change in CPI:

This is the total percentage the inflation rate increased or decreased from the start year to the end year.

Avg rate:Average rate:Average annual rate of inflation:Average annual rate of inflation:

Average annual rate of inflation:

This is the average annual rate of inflation from the start year to the end year.

If you would like to save the current entries to the secure online database, tap or click on the Data tab, select "New Data Record", give the data record a name, then tap or click the Save button. To save changes to previously saved entries, simply tap the Save button. Please select and "Clear" any data records you no longer need.

Feedback AppreciatedFeedback Greatly AppreciatedYour Feedback Would Be Greatly AppreciatedYour Feedback Is Greatly Appreciated


Help and Tools

Help and Tools:

This section, which you can Unstick or Hide in the Calculator Preferences (just above the top of the calculator), contains the following tabs (content too long to fit within bordered frame can be scrolled up and down):

About: Click this tab for an introduction to the calculator.

Instructions: Click this tab for step-by-step instructions for using the calculator.

Terms: Click this tab for a list of the descriptions that are located within each popup help button (info icons).

PCalc: Click this tab for a handy "pocket" calculator you can use when you need to calculate an entry needed for the calculator.

Data: Click this tab to save a set of entries or a note in between visits. Entries and notes will be stored to your web browser's local storage (if supported by your browser of choice), meaning they can only be recalled with the same device and web browser you were using when you saved them. If you'd like to save entries and notes between devices you can do so by subscribing to the Ad-Free Member Version.



Add or remove this page to/from my favorites.

Adjust Calculator Width:

Move the slider to left and right to adjust the calculator width. Note that the Help and Tools panel will be hidden when the calculator is too wide to fit both on the screen. Moving the slider to the left will bring the instructions and tools panel back into view.

Also note that some calculators will reformat to accommodate the screen size as you make the calculator wider or narrower. If the calculator is narrow, columns of entry rows will be converted to a vertical entry form, whereas a wider calculator will display columns of entry rows, and the entry fields will be smaller in size ... since they will not need to be "thumb friendly".

Show/Hide Popup Keypads:

Select Show or Hide to show or hide the popup keypad icons located next to numeric entry fields. These are generally only needed for mobile devices that don't have decimal points in their numeric keypads. So if you are on a desktop, you may find the calculator to be more user-friendly and less cluttered without them.

Stick/Unstick Tools:

Select Stick or Unstick to stick or unstick the help and tools panel. Selecting "Stick" will keep the panel in view while scrolling the calculator vertically. If you find that annoying, select "Unstick" to keep the panel in a stationary position.

If the tools panel becomes "Unstuck" on its own, try clicking "Unstick" and then "Stick" to re-stick the panel.