Inflation Calculator

Free inflation calculator to measure changes in purchasing power and the future value of money over time.

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Cumulative Inflation & Purchasing Power Formulas

Last reviewed: September 2026

Calculation Formula

Historical: V_target = V_initial × (CPI_target ÷ CPI_initial) | Projected: V_future = V_initial × (1 + r)^t

Variables & Definitions

V_initial:
Original baseline monetary amount in the starting base year
CPI_initial:
US Bureau of Labor Statistics CPI-U index value for the start year
CPI_target:
US Bureau of Labor Statistics CPI-U index value for the target year
V_target:
Equivalent monetary amount required to achieve identical purchasing power
r:
Annualized compounding inflation rate (e.g. 0.03 for 3% projection)
t:
Number of compounding years into the future

Core Assumptions

  • Historical calculations utilize the official annual US Bureau of Labor Statistics Consumer Price Index for All Urban Consumers (CPI-U).
  • Forward-looking projections assume constant annual geometric compound growth without deflationary shocks.
Disclaimer: The CPI-U reflects average price changes across an urban consumer market basket. Individual household inflation may differ substantially depending on local housing rental markets, college tuition, energy consumption, and medical healthcare needs.

Worked Example: Purchasing Power of $100 in 2000 vs. Present

An individual holds a $100 bill saved in January 2000 and wants to determine what that same money buys today after over two decades of compounding price inflation:

Base Year 2000 Price IndexAnnual Average CPI-U = 172.2
Present Day Price IndexCPI-U = ~325.0
Inflation-Adjusted Equivalent$100 × (325.0 ÷ 172.2) = ~$188.73
Cumulative Price Inflation+88.73% overall increase (average ~2.49% per year)

💡 A basket of groceries and services that cost $100 in the year 2000 requires roughly $188.73 today. Conversely, $100 today only purchases about $53.00 worth of goods measured in 2000 dollars.

How to use Inflation Calculator

  1. 1

    Enter an initial dollar amount (e.g., $100, $50,000, or a historical annual salary) and select the starting year.

  2. 2

    Choose the target year (from 1913 to present based on official historical CPI data, or project forward with custom annual rates).

  3. 3

    Review the inflation-adjusted equivalent value, cumulative percentage increase, and the compounding loss of purchasing power.

Why use this tool?

Understand Real vs. Nominal Value of Money

A salary of $50,000 in 2005 sounds decent — but in today's dollars it would be over $80,000. This calculator reveals the true purchasing power behind any historical dollar amount.

Backed by Official U.S. CPI-U Data

All historical calculations use the U.S. Bureau of Labor Statistics Consumer Price Index (CPI-U) — the gold standard used by economists, government agencies, and central banks.

Essential for Salary Negotiations & Retirement Planning

Find out if your raises have kept pace with real-world cost-of-living increases, or model how future 2–4% inflation will erode your retirement nest egg over 20 to 30 years.

Continue your workflow

See how investing in high-yield assets can outpace inflation with the Calculate compound investment growth.

Checking whether your modern salary matches your lifestyle needs? Use the Evaluate take-home wages and payroll taxes.

Interested in how fixed debt amortizes while inflation rises? Try the Calculate fixed-rate borrowing costs.

Frequently asked questions

What is $100 in 1990 worth today?

Using official US CPI-U data, $100 in 1990 is equivalent to approximately $245–$250 today, representing an overall cumulative price increase of nearly 150%.

Did my salary keep up with inflation?

Enter your starting salary and year in the calculator. If the inflation-adjusted equivalent value is higher than what you currently earn today, your real inflation-adjusted purchasing power has decreased.

Can I project future inflation on my savings?

Yes. Select the current year as start, choose your planned retirement year (e.g. 2045 or 2055), and enter an assumed annual rate (such as the Federal Reserve target of 2.5% to 3.0%). The calculator shows the future nominal value needed to maintain your lifestyle.

What is the difference between nominal dollars and real dollars?

Nominal dollars refers to the literal face value printed on currency without accounting for purchasing power changes over time. Real dollars adjusts nominal figures for inflation to measure the actual volume of goods and services that money can buy relative to a specific base year.

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