Purchasing Power Calculator

Model future cost and the purchasing power of unchanged money with an entered inflation rate.

Inputs stay on your device No sign-up Free to use
How this works

The tool runs in this browser. Your file or text is not uploaded to UseFreeTools. Check this tool's limits for anything it may save on your device.

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Calculate result controls

Showing an example. Edit to see your own.

Use an entered constant rate. Negative values model deflation; no historical inflation data is loaded.

Processed in your browser. Your inputs stay on this device.

How to use Purchasing Power Calculator

  1. Enter an amount in one currency.
  2. Set your annual inflation assumption and whole years.
  3. Compare modeled future cost with the purchasing power of unchanged money.

Example: Purchasing Power Calculator

Purchasing Power Calculator: An item costing 1000.00 today would cost 1159.27 after 5 years at the entered rate.

You add
Initial amount: 1000 Annual inflation percentage: 3 Whole years: 5
You get
An item costing 1000.00 today would cost 1159.27 after 5 years at the entered rate. Future equivalent cost: 1159.27 Purchasing power in today's money: 862.61 Price factor: 1.159274 Cumulative price change: 15.927407% Annual entered rate: 3% Years: 5 Initial amount | 1000.00 Future equivalent cost | 1159.27 Purchasing power in today's money | 862.61

Options

Inflation assumption
Enter one constant annual percentage for every modeled year. This is your scenario, not a fetched inflation series.
Elapsed years
Use whole years. Compounding applies once for each entered year and does not model a partial-year date range.

Supported inputs and limits

Constant annual entered inflation greater than -100% and at most 100%, for 0 to 100 whole years. Deflation is allowed. No historical index, currency conversion or personalized basket of prices. Extreme outputs use scientific notation. Enter plain decimals with at most 64 characters, 25 digits and 12 fractional places. Monetary inputs are limited to 10^12. Very small or large nonzero amounts use scientific notation. Use one currency throughout; no exchange rates, taxes or fees are added unless you enter them.

Where your input is processed

This tool processes your input in this browser. Your text and files are not uploaded to UseFreeTools. Check this tool's limits for anything it may save on your device.

Keep nominal amounts and buying power separate

Future equivalent cost shows the amount needed under the entered inflation assumption. Present purchasing power shows what an unchanged nominal amount represents after the same elapsed time. Different spending baskets can experience different price changes; the page does not choose an inflation measure for a household.

Questions about Purchasing Power Calculator

Does this use an official inflation series?

No. You enter the rate. The same assumption is applied every year.

Why are there two amounts?

Future cost multiplies by the compounded inflation factor. Purchasing power divides unchanged money by that same factor.

Can I enter deflation?

Yes, using a negative rate greater than -100%. The model then lowers future equivalent cost and raises purchasing power.

Project manager: Tony Hines · Content updated 4 October 2026 · Report a problem