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Purchasing Power Calculator

Uncover the hidden tax. Calculate exactly how inflation erodes your wealth over time.

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Adjusted Value in 2024
$231.53
Cumulative Inflation

131.5%

The Invisible Tax: Understanding Inflation

If you bury $100 in your backyard and dig it up 10 years later, you will still have exactly $100. However, that money will buy significantly less than it could have a decade prior.

How to Use This Tool

  1. Step 1: Enter Historical Sum - Input the amount of money from a specific year in the past.
  2. Step 2: Define Timeframe - Set the start and end years to calculate the cumulative inflation impact.
  3. Step 3: Adjust Rate - Modify the average annual inflation rate to see different economic scenarios.

How the inflation calculator works

Inflation is the rate at which prices rise over time. This calculator compounds the yearly rate: a price after n years equals today's price × (1 + rate)^n. Because each year's increase builds on the last, the effect grows faster than simply multiplying the rate by the number of years.

The same maths shows how purchasing power falls. If prices rise by a total factor F, what a fixed sum of money buys shrinks by dividing by F. Inflation is usually measured with a consumer price index, which tracks the price of a typical basket of goods and services.

Worked examples

A $100 basket at 3% a year for 10 years

  • 100 × 1.03^10 = $134.39

What $100 of cash buys after 10 years at 3%

  • 100 ÷ 1.3439 ≈ $74.41 in today's money

The rule of 72

  • Divide 72 by the inflation rate to estimate how many years until prices double.
  • At 3% that is 72 ÷ 3 = 24 years. The exact figure is about 23.5.

Tips and common mistakes

  • Use the rate that fits your situation. National averages hide big differences between rent, food, fuel and school fees.
  • Compare real and nominal values: a 5% pay rise with 4% inflation is only about a 1% real rise.
  • Rates change from year to year, so run several scenarios instead of relying on one.

Frequently Asked Questions

Inflation is the rate at which the general level of prices for goods and services is rising, decreasing the purchasing power of your money.
Future cost is what an item today will cost later. Purchasing power is what your money today will be worth in the future.
Mainly due to demand outpacing supply (demand-pull) or rising production costs (cost-push). Central bank policies also play a role.

Every tool runs entirely in your browser. No sign-up, no data collection, no unnecessary steps.

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