Introduction
Inflation is the rise in prices over time. When prices go up, each dollar you have buys less than it used to. Our Inflation Calculator helps you see how the value of money changes from one year to another. Enter a dollar amount, pick a start year and an end year, and the calculator adjusts the amount for inflation between those years. This tool uses historical inflation rates to show you what your money was worth in the past or what it might be worth today. This calculator gives you a clear and quick answer for planning a budget, studying the economy, or simply satisfying your curiosity about how prices have changed.
How to Use Our Inflation Calculator
Enter a dollar amount and choose your dates to see how inflation has changed the value of your money over time. The calculator shows you the adjusted amount, cumulative inflation rate, average annual inflation rate, and a year-by-year breakdown using real CPI data.
Dollar Amount: Type in the amount of money you want to check. For example, enter 100.00 to see what $100 from the past would be worth today.
Start Date: Pick the month and year where you want to begin your calculation. You can choose a specific month or select "Average" to use the yearly average CPI. The earliest available date is January 1913.
End Date: Pick the month and year where you want to end your calculation. This is usually set to the most recent month with available data.
Click "Calculate Inflation" to see your results, including a chart and a detailed table showing how the value changed each year. Click "Reset" to return all fields to their default settings.
The calculator also includes a Custom Inflation Projection tool below the main results. Use it to estimate how inflation could affect your money in the future.
Dollar Amount (Projection): Enter the amount of money you want to project forward. This is the value you hold today.
Annual Inflation Rate: Enter the yearly inflation rate you want to use for your projection. The default is 3%, which is close to the long-term historical average in the United States.
Number of Years: Enter how many years into the future you want to project. You can enter any number from 1 to 200.
Click "Project Inflation" to see how much buying power your money will lose and how much you would need in the future to match today's purchasing power. Click "Reset" to restore the default projection settings.
What Is Inflation?
Inflation is the rate at which prices for goods and services go up over time. When inflation rises, every dollar you have buys a little less than it did before. For example, a gallon of milk that cost $1.00 in 1990 might cost over $4.00 today. The milk didn't change. The value of the dollar did. Understanding inflation is essential for managing your finances.
How Inflation Is Measured
In the United States, inflation is most commonly tracked using the Consumer Price Index (CPI), published by the Bureau of Labor Statistics (BLS). The CPI measures the average change in prices paid by consumers for a basket of everyday items like food, housing, clothing, transportation, and medical care.1 When the CPI goes up, it means the overall cost of living has increased. This calculator uses historical CPI-U (Consumer Price Index for All Urban Consumers) data going back to 1913 to give you accurate, real-world results.2
How This Inflation Calculator Works
This tool has two parts. The historical inflation calculator at the top lets you pick a dollar amount, a start date, and an end date. It then uses actual CPI data to show you what that amount of money would be worth in the other time period. It also shows you the cumulative inflation rate, the average annual inflation rate, and a year-by-year breakdown with a chart so you can see exactly how prices changed over time.
The custom inflation projection tool at the bottom lets you look forward. You enter a dollar amount, an assumed annual inflation rate, and a number of years. It then calculates how much purchasing power your money will lose and how much you would need in the future to match today's buying power. This is helpful for retirement planning, budgeting, and setting long-term savings goals.
Key Terms to Know
- Cumulative Inflation Rate: The total percentage change in prices from the start date to the end date.
- Average Annual Inflation Rate: The inflation rate averaged out per year over the time period you selected. This gives you a single, easy-to-understand number for how fast prices rose each year on average.
- Purchasing Power: The amount of goods or services one dollar can buy. As inflation goes up, purchasing power goes down.
- Adjusted Amount: The dollar value in the end year that has the same real buying power as your original amount in the start year.
Why Inflation Matters
Inflation affects everyone. If your income or savings don't grow at least as fast as inflation, you are effectively losing money. A savings account earning 1% interest during a year when inflation is 3% means your money actually lost 2% of its real value. This is why investors, retirees, and anyone planning for the future needs to understand how inflation works. It also explains why prices your parents or grandparents remember seem so low compared to today: the dollars themselves have become worth less over time.
The average annual inflation rate in the U.S. has been roughly 3% over the past century, though individual years can vary widely. Some periods, like the late 1970s and early 1980s, saw inflation above 10%, while other years experienced very low or even negative inflation (known as deflation).2 Inflation also directly impacts major financial decisions. For instance, when evaluating an auto loan or deciding whether to refinance your mortgage, understanding the real cost of borrowing after inflation can change your strategy. Similarly, if you're building long-term wealth through dividend investing, factoring in inflation helps you assess whether your returns are truly growing your purchasing power or merely keeping pace with rising prices.