Inflation Calculator
Estimate how the value of money changes between two years using a constant inflation rate.
How does this inflation calculator work?
This calculator applies a single, constant average annual inflation rate compounded over the number of years between your starting year and ending year: adjusted amount = starting amount × (1 + rate/100) raised to the power of years elapsed. It's a quick way to see roughly how much purchasing power a dollar amount loses (or how much more it would cost) over a chosen time span.
This is an approximation, not official CPI data
Real-world inflation, as measured by the Consumer Price Index (CPI), varies significantly from year to year — some years see 1-2% inflation, while others (like 2021-2022) saw spikes above 7-8%. This tool does not pull actual historical CPI figures; instead it uses whatever constant rate you enter to project a smooth, simplified estimate. For precise historical inflation adjustments, consult the Bureau of Labor Statistics CPI inflation calculator or similar official data sources.
Why understanding inflation matters
Inflation erodes the purchasing power of cash over time, which is why $1,000 today won't buy as much a decade from now if prices keep rising. Understanding roughly how inflation compounds can help with retirement planning, setting savings goals, negotiating raises, and evaluating whether an investment's returns are actually outpacing the rising cost of living.
Frequently Asked Questions
Does this calculator use real historical inflation data?
No. It applies a single constant inflation rate that you choose, compounded evenly across every year in the range. Actual inflation varies year to year, so this is a simplified estimate rather than an exact historical CPI adjustment.
What inflation rate should I use?
The long-run US average is often cited around 3%, though it has ranged from near 0% to over 8% in different periods. Try a few different rates to see a realistic range of outcomes rather than relying on a single number.
How is inflation actually measured in real life?
Government agencies like the Bureau of Labor Statistics track the Consumer Price Index (CPI), which measures price changes across a large basket of goods and services each month. Actual annual inflation is the year-over-year percentage change in that index, not a fixed constant.
Why does inflation compound over time?
Each year's price increase is applied to the already-inflated prices from the year before, similar to compound interest. Over many years, even a modest average rate can significantly erode purchasing power because the effect builds on itself.
How does inflation affect my retirement savings?
If your investments don't grow faster than inflation, the real purchasing power of your savings shrinks even as the account balance grows. That's why many retirement plans target returns that outpace expected inflation over the long term.
What's the difference between nominal and real value?
Nominal value is the raw dollar amount without adjusting for inflation, while real value reflects actual purchasing power after accounting for rising prices. A raise that's smaller than inflation actually reduces your real income even though your nominal paycheck went up.
Can I use this to estimate future prices, not just past ones?
Yes — enter a future ending year and a projected inflation rate to see roughly how much more something might cost, or how much a fixed sum's purchasing power might shrink by then. Just remember it's a projection based on your assumed rate, not a guarantee.
Where can I find official historical inflation figures?
The US Bureau of Labor Statistics publishes an official CPI inflation calculator using actual historical data, which is more precise than this tool's constant-rate approximation if you need exact past figures.