Inflation Calculator

An inflation calculator shows how the purchasing power of money changes over time. This tool offers two modes. The Future Value mode projects how much a dollar will be worth in a given number of years at a chosen inflation rate — it answers "what will my money be worth in the future?" The Historical CPI mode uses real Consumer Price Index (CPI-U) data from the US Bureau of Labor Statistics going back to 1913 to compare the buying power of a dollar between any two years. Both use compound-interest math: for future value, we multiply (or divide) by (1 + rate)^years; for historical comparison, we multiply by the ratio of the two CPI index values.

Since 1913, the long-run average US inflation rate has been roughly 3.1% per year. The Federal Reserve's explicit target is 2% annual inflation measured by core PCE, and since inflation targeting became formalized in the early 1990s, realized CPI inflation has averaged about 2.5%. For retirement and long-horizon financial planning, 2.5–3% is a defensible default. If you want a more conservative plan, use 3.5–4%; if you want the most optimistic scenario, use the Fed's 2% target. Try a range of assumptions in this inflation calculator to see how sensitive your results are to the rate you pick.

Nominal value is the dollar amount printed on the price tag — it ignores inflation. Real value is the same amount adjusted for inflation, expressed in the purchasing power of a base year. For example, $100,000 of nominal income in 2005 had the same real buying power as roughly $165,000 in 2025, because the CPI rose about 65% over those 20 years. When you look at your savings, salary, or an investment return over many years, you almost always want to think in real terms — the nominal growth of your account balance is misleading if inflation is eroding it faster. Our inflation calculator makes this distinction explicit: the Future Value mode shows both the nominal dollars needed to match today's buying power and the real purchasing power of a fixed nominal amount.

Switch to Historical CPI mode, enter a dollar amount, pick the starting year (any year from 1913), and pick the ending year (any year up to the most recent complete year). The calculator uses annual-average CPI-U data to compute (a) the equivalent value in the target year, (b) the cumulative percentage change in the price level, and (c) the annualized inflation rate over that span. This is the same method the Bureau of Labor Statistics uses in its own CPI Inflation Calculator, so results will match to within rounding.

Using BLS annual-average CPI-U, $1.00 in 1980 had the same buying power as roughly $3.91 in 2025 — meaning a dollar from 1980 only buys about 26 cents' worth of goods today. Put another way, cumulative US inflation from 1980 to 2025 is approximately 291%, or about 3.1% per year annualized. These are the kinds of numbers the Historical CPI mode of this calculator produces instantly for any pair of years.

Cash and low-yield savings lose real value every year inflation runs above the interest rate they earn. For example, $10,000 sitting in a 0.5% savings account for 20 years with 3% inflation becomes worth only about $6,100 in today's dollars — even though the nominal balance grew to $11,049. To beat inflation, your money generally needs to be invested in assets whose long-run expected return exceeds inflation: stocks (historically 6–7% real), TIPS (Treasury Inflation-Protected Securities), I-bonds, real estate, and some commodities. Use the optional "Expected Annual Return on Savings" field in Future Value mode to see whether your assumed return is actually beating inflation over your horizon.

There are several legitimate measures of inflation and each gives a slightly different result: CPI-U (the most common, covers urban consumers), CPI-W (urban wage earners, used for Social Security COLA), core CPI (excludes food and energy), PCE (used by the Federal Reserve for its 2% target), and chained CPI (accounts for substitution behavior). Our calculator uses annual-average CPI-U because it is the standard headline measure reported by the Bureau of Labor Statistics and the one most media and financial planners quote. Small differences between calculators also come from whether they use monthly, quarterly, or annual averages and how they handle the most recent (not-yet-finalized) month.

Yes — inflation is one of the most important variables in any long-horizon financial plan, and this calculator is built to help you model it. For retirement planning, use Future Value mode: enter your target nest egg or annual spending amount, your years-to-retirement, and a long-run inflation assumption (2.5–3% is common). The calculator will show how many nominal dollars you'll need to preserve today's standard of living. Combine this with our Compound Interest Calculator to estimate how your savings will grow, and the difference between the two is your real-terms wealth gain. For a historical reality check on how much prices have changed over a full career, switch to Historical CPI mode and compare, say, 1985 to today.