How do I calculate what $100 from a past year is worth today?

Enter $100, choose that past year as the start year, and select the current year as the end year. The calculator will show the inflation-adjusted value.

What does inflation-adjusted mean in simple words?

It means the amount is updated to reflect how prices changed, so you can compare buying power across different years.

Is CPI the same as inflation?

CPI is a common way to measure inflation. It tracks average price changes for a typical basket of goods and services.

Why does the calculator give a bigger number for later years?

Because prices often rise over time. You usually need more money in a later year to buy the same things.

Can the adjusted value ever be lower than the original?

Yes. If prices dropped overall between the two years, the inflation-adjusted value can be lower.

What is total inflation versus average annual inflation?

Total inflation is the full change from the start year to the end year. Average annual inflation spreads that change across each year to show a typical yearly pace.

Why might my real-life costs not match the calculator?

The calculator uses average prices. Your costs depend on your location, lifestyle, and what you buy most.

Can I use an inflation calculator to compare salaries?

Yes. It helps you see how an older salary compares in buying power to a salary in another year.

Is this useful for retirement planning?

Yes, as a starting point. It helps you understand how inflation can reduce purchasing power over long periods.

Does this calculator predict future inflation?

Most inflation calculators are designed to compare years using recorded index values. Future inflation is uncertain and can change due to economic conditions.

Inflation Calculator: Adjust Prices for Today's Dollars

An inflation calculator helps you compare the value of money across different years. It shows how prices and purchasing power change over time, so you can understand what an older amount would be "worth" today, or how today's money may compare to another year. This tool is helpful for anyone reviewing past prices, old salaries, long-term savings, budgets, or retirement plans. You enter an amount and choose a start year and an end year. The calculator then provides an inflation-adjusted value, plus extra insights like the total change across the period and an average annual change (when shown).

How to Use This Calculator

Enter the amount you want to adjust.
Select the start year (the year the original amount belongs to).
Select the end year (the year you want to compare against).
Click calculate to get your updated value.
Review the supporting results, such as total change and average yearly change (if included).

What This Calculator Measures

This calculator measures how inflation affects the purchasing power of money across time. In simple terms, inflation is when prices generally go up over the years. That means the same amount of money usually buys less later. The calculator estimates that change using a price index (commonly CPI) so you can compare values more fairly.

Key terms in plain language:

Inflation: A general rise in prices over time.
Purchasing power: How much your money can buy.
Price index (CPI): A number that tracks average price changes for common goods and services. This tool uses the CPI-U (Consumer Price Index for All Urban Consumers), published monthly by the U.S. Bureau of Labor Statistics (BLS), which covers approximately 93% of the U.S. population and is the most widely used inflation benchmark for general planning purposes.
Inflation-adjusted value: The equivalent amount after accounting for price changes.
Nominal vs. real: Nominal is the raw number; real is adjusted for inflation.

Formula or Logic (Easy Explanation)

The tool compares the price index value from your start year to the price index value in your end year. If the index is higher in the end year, prices increased overall. So the calculator scales your original amount upward to match that price growth. If the index is lower, it suggests overall prices fell during that period (deflation), and the adjusted amount can be smaller. Some versions also show an average annual inflation rate. This is a simplified way to express the overall change as a "typical per-year" pace across the full time period.

Example Calculations

Example 1: $100 in 2000 vs. 2025 (using BLS CPI-U data)

Inputs: $100 | Start Year: 2000 (CPI-U: 168.8) | End Year: 2025 (CPI-U: ~314)
Inflation-adjusted value: ≈ $186
Meaning: You would need approximately $186 in 2025 to have the same purchasing power as $100 in January 2000 — a total inflation of about 86% over 25 years, averaging roughly 2.5% per year.

Example 2: $50,000 salary in 2010 vs. 2020

Inputs: $50,000 | Start Year: 2010 (CPI-U: 218.1) | End Year: 2020 (CPI-U: 258.8)
Inflation-adjusted value: ≈ $59,330
Meaning: A $50,000 salary in 2010 had the buying power of about $59,330 in 2020. If your salary in 2020 was below that, your real (inflation-adjusted) pay actually fell over the decade.

Example 3: $1,000 in 2022 vs. 2023 (high-inflation period)

Inputs: $1,000 | Start Year: 2022 (CPI-U: 296.8) | End Year: 2023 (CPI-U: 304.7)
Inflation-adjusted value: ≈ $1,027
Meaning: Even within a single high-inflation year, the same basket of goods cost about 2.7% more — meaning $1,000 of purchasing power in early 2022 required $1,027 by early 2023.

Understanding Your Results

Your results usually include an inflation-adjusted value and supporting details.

Inflation-adjusted value: The "equivalent" amount in the end year.
Total inflation change: The overall price change across the full period, often shown as a percentage.
Average annual inflation (if shown): A smoothed yearly rate that helps compare different time spans.

Keep in mind this is an estimate based on average prices. Your personal cost of living can change differently depending on where you live and what you spend on most.

Why Your Personal Inflation May Differ from CPI

CPI-U tracks a fixed "basket" of goods representing average consumer spending. Your actual cost increases depend on your spending pattern:

Healthcare costs have risen significantly faster than overall CPI for many years. If medical expenses are a large share of your budget, your personal inflation rate may be higher than the CPI figure.
Technology and electronics have generally declined in price even as CPI rose. Heavy technology spenders may experience lower personal inflation.
Housing: Rent and home price inflation in some metros has far outpaced national CPI. Urban renters in cities like San Francisco or New York have faced inflation rates well above the national average.
Geographic variation: The BLS publishes regional CPI data. Cost pressures in rural areas can differ substantially from coastal urban markets.

This is also why CPI comparisons are most meaningful for broad planning — like retirement savings projections — rather than predicting your exact personal expenses.

Common Mistakes to Avoid

Choosing the wrong start year for the amount you're adjusting.
Accidentally reversing the start year and end year.
Treating the result as exact for your personal budget.
Forgetting that some costs rise faster than others (like rent or healthcare).
Comparing salaries without considering taxes, benefits, or working hours.
Expecting big changes over very short time periods.
Assuming inflation works the same in every country or region.

Inflation Calculator: See What Money Is Worth Over Time