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Inflation Calculator — Purchasing Power & CPI Adjustment

Calculate the adjusted value of money over time using a custom inflation rate. See how inflation erodes purchasing power between any two years.

What is this calculator?

This inflation calculator shows you how much a sum of money from one year is worth in another year, using a user-specified annual inflation rate. It also reveals total cumulative inflation and purchasing power erosion over the period.

Formula

Adjusted Amount = Amount × (1 + Rate/100)^(ToYear − FromYear) Total Inflation = ((Adjusted / Original) − 1) × 100 Purchasing Power Loss = 100 − (Original / Adjusted × 100)

Example

A $10,000 amount from 2000 adjusted to 2024 at 3% annual inflation: $10,000 × (1.03)^24 ≈ $20,327.94. Total inflation is 103.3% and purchasing power loss is 50.8% — the original $10,000 now has the buying power of about $4,919.

How to use

  1. 1Enter the original amount of money and the starting year.
  2. 2Set the target year and adjust the annual inflation rate (default 3%).
  3. 3Click Calculate to see the inflation-adjusted value, total cumulative inflation, and how much purchasing power has been lost.

Frequently Asked Questions

What does the adjusted amount represent?
The adjusted amount tells you what the original sum of money is worth in the target year's dollars. If you had $1,000 in 2000 and inflation averaged 3% per year, by 2024 you would need about $2,032 to have the same purchasing power. Alternatively, your original $1,000 from 2000 is only worth about $492 in 2024 terms.
How is purchasing power loss calculated?
Purchasing power loss shows how much less your original amount can buy in the target year. It is calculated as: 100 − (original amount / adjusted amount × 100). For $1,000 adjusted to $2,032 over 24 years at 3%, purchasing power loss is 100 − (1000/2032 × 100) ≈ 50.8%, meaning money buys roughly half as much.
What is the average US inflation rate?
The long-run average US CPI inflation rate is approximately 3% per year, though it varies significantly by decade. The 1970s saw rates above 10%, while the 2010s averaged around 1.7%. Recent years (2021–2023) saw peaks of 7–9%. The default of 3% is a reasonable historical average for long-term planning.
How is total inflation different from the inflation rate?
The inflation rate is the annual percentage change in prices. Total inflation is the cumulative compounded change over the full period. At a 3% annual rate over 24 years, total inflation is (1.03^24 − 1) × 100 ≈ 103.3%, meaning prices more than doubled over that span.
Can I use this for future projections?
Yes. Set 'From Year' to the current year and 'To Year' to a future year. The calculator uses the formula adjustedAmount = amount × (1 + rate/100)^years, which is valid for both historical lookups and forward projections — understanding that future rates are estimates.

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