Find out what a dollar amount from any past year is worth in today’s dollars — or project how inflation will erode purchasing power in the future. Uses historical U.S. CPI data and forward projections.
What would you like to calculate?
Year-by-year breakdown
What $100 buys less of today
Everyday examples of how inflation erodes purchasing power over time.
Value over time
Historical CPI data sourced from U.S. Bureau of Labor Statistics (BLS). Past-to-present calculations use actual CPI figures. Future projections use a user-specified or default rate and are estimates only.
How to Use the Inflation Calculator
- Enter the original amount — Input the dollar amount you want to adjust for inflation, whether that’s a past salary, a historical price, or a future savings goal.
- Enter the starting year — Select the year the original amount is from. The calculator uses historical CPI data to measure how prices have changed from that year forward.
- Enter the ending year — Select the year you want to convert the amount to. Use the current year to find today’s equivalent, or a future year to project what an amount will need to be to maintain its purchasing power.
- Enter a custom inflation rate (optional) — For future projections, you can input a custom annual inflation rate rather than relying on historical averages. Use current Fed target rates or recent CPI figures for a more tailored estimate.
- Click Calculate — The tool displays the inflation-adjusted equivalent amount, the total cumulative inflation rate over the period, and the average annual inflation rate between the two years.
How the Inflation Calculator Works
A dollar today is not the same as a dollar ten years ago — and it won’t be the same as a dollar ten years from now. Inflation steadily erodes the purchasing power of money over time, which means any financial plan that ignores it is built on a flawed foundation. This calculator uses the Consumer Price Index to translate dollar amounts across time, giving you an accurate picture of what money was worth, what it’s worth today, and what it will need to be worth in the future to maintain the same real value.
What Is the Consumer Price Index?
The Consumer Price Index, or CPI, is the primary measure of inflation in the United States, published monthly by the Bureau of Labor Statistics. It tracks the average change in prices paid by urban consumers for a representative basket of goods and services across eight major categories: food and beverages, housing, apparel, transportation, medical care, recreation, education and communication, and other goods and services. When the CPI rises, each dollar buys less than it did before. The CPI is used to adjust Social Security benefits, federal income tax brackets, and a wide range of financial contracts — making it one of the most consequential economic statistics published by the government.
Cumulative vs. Annual Inflation Rate
Inflation is reported two ways that mean very different things. The annual inflation rate is the percentage increase in prices over a single 12-month period — the figure most commonly cited in news coverage. The cumulative inflation rate is the total percentage increase in prices over a longer span of years. These numbers diverge significantly over time. A 3% annual inflation rate sustained over 25 years produces a cumulative inflation rate of approximately 107% — meaning prices more than double. Understanding cumulative inflation is essential for long-term financial planning because it reveals the true erosion of purchasing power over the timelines that matter most: a 30-year career, a 25-year retirement, or a 20-year savings horizon.
How Inflation Affects Different Expense Categories
The CPI reflects average price changes across a broad basket of goods, but inflation does not affect all expenses equally. Healthcare costs have historically risen at roughly twice the overall CPI rate — a critical consideration for retirement planning. College tuition has increased at an even faster pace over recent decades. Housing costs, particularly rent, have surged in many metro areas at rates well above general inflation since 2020. On the other hand, consumer electronics and many manufactured goods have declined in real price over time due to technological improvement. When planning for future expenses, it’s more accurate to use category-specific inflation rates for major spending areas rather than applying a single CPI figure to everything.
Inflation and Fixed-Income Retirees
Inflation poses a particular risk to retirees living on fixed income sources. A retiree receiving $3,000 per month in pension income that does not include a cost-of-living adjustment will see the real purchasing power of that income fall by approximately 26% over 10 years at 3% average annual inflation — and by nearly 45% over 20 years. Social Security includes an annual cost-of-living adjustment (COLA) tied to CPI, which provides partial inflation protection, but most private pensions, annuities, and fixed-income investments do not. Building a retirement income strategy that accounts for inflation — through COLA-adjusted income sources, Treasury Inflation-Protected Securities (TIPS), or growth assets in the portfolio — is essential for maintaining purchasing power throughout a multi-decade retirement.
The Fed’s 2% Inflation Target and What It Means for Planning
The Federal Reserve targets an average annual inflation rate of 2% over time, using interest rate policy as its primary tool to keep inflation near that level. From 1990 to 2020, average annual CPI inflation in the U.S. was approximately 2.5%. The post-pandemic surge pushed inflation above 9% in mid-2022 before the Fed’s aggressive rate increases brought it back toward the 2–3% range by 2024–2025. For long-term financial planning, using a 2.5–3.0% assumed inflation rate is generally appropriate. For near-term projections in an environment of elevated inflation, using the current trailing 12-month CPI rate gives a more accurate short-term estimate.
Real vs. Nominal Returns
Every investment return has two versions: the nominal return, which is the raw percentage gain, and the real return, which is the nominal return minus inflation. A savings account earning 4.5% APY during a period of 3% inflation produces a real return of approximately 1.5% — that’s the actual increase in purchasing power. A stock portfolio returning 10% during the same period has a real return of about 7%. When evaluating long-term investment performance or projecting retirement savings growth, always consider real returns rather than nominal returns. Inflation doesn’t just affect spending — it silently reduces the true value of every dollar your investments earn.
Historical U.S. Inflation Rate by Decade
The following table shows the average annual CPI inflation rate by decade to provide historical context for planning assumptions.
| Decade | Avg. Annual CPI Inflation | Cumulative Decade Inflation | Notable Context |
|---|---|---|---|
| 1970s | 7.1% | ~97% | Oil embargo, stagflation |
| 1980s | 5.1% | ~64% | Volcker rate hikes, disinflation |
| 1990s | 3.0% | ~34% | Relative price stability |
| 2000s | 2.6% | ~29% | Mild inflation, 2008 crisis dip |
| 2010s | 1.8% | ~20% | Post-crisis low inflation era |
| 2020–2025 | 4.7% | ~26% | COVID supply shock, 2022 peak at 9.1% |
Source: U.S. Bureau of Labor Statistics CPI historical data. 2020–2025 figure reflects annualized average through mid-2025.
Frequently Asked Questions
What inflation rate should I use for retirement planning?
For general long-term retirement planning, a 2.5–3.0% annual inflation assumption is widely used and historically grounded. For healthcare expenses specifically, a 4.5–5.5% annual rate better reflects the historical trend of medical cost inflation. If you’re planning for a retirement that begins 20 or more years in the future, using a slightly higher general inflation assumption — 3.0–3.5% — builds in a margin of conservatism that guards against a potential return to higher inflation environments like those seen in the 1970s and early 2020s.
How does inflation affect my salary over time?
Inflation erodes the real value of a fixed salary each year. If your salary stays flat at $70,000 while inflation runs at 3% annually, your real purchasing power falls to the equivalent of roughly $63,800 after three years and $58,000 after five years — even though the nominal number on your paycheck hasn’t changed. This is why cost-of-living raises are not truly raises in the economic sense; they simply maintain real compensation. Any raise below the current inflation rate is effectively a pay cut in purchasing power terms, a fact worth understanding when evaluating compensation offers and negotiating salary increases.
What is the difference between CPI and PCE inflation?
The Consumer Price Index (CPI) and the Personal Consumption Expenditures price index (PCE) are both measures of inflation, but they differ in methodology and scope. The CPI measures price changes for a fixed basket of goods purchased by urban consumers. The PCE measures price changes across all consumer spending in the economy, including spending on behalf of consumers by employers and government programs like Medicare. The Federal Reserve uses the PCE as its preferred inflation measure because it more broadly captures economy-wide price changes. PCE inflation typically runs 0.2–0.4 percentage points below CPI, which is why the Fed’s 2% PCE target roughly corresponds to 2.2–2.4% CPI.
How does inflation affect my emergency fund?
Inflation gradually reduces the real value of your emergency fund if the account’s interest rate doesn’t keep pace. At 3% annual inflation, a $15,000 emergency fund held in a zero-interest checking account loses approximately $450 of real purchasing power per year. Held in a high-yield savings account earning 4.5% APY, the same fund earns $675 in interest annually — staying ahead of inflation and modestly growing in real terms. This is a strong practical argument for keeping emergency savings in a high-yield account rather than a standard checking or savings account: the rate difference directly determines whether your emergency fund maintains, gains, or loses real value over time.
Is it possible for inflation to be good for some people?
Yes — inflation has clear beneficiaries alongside its costs. Borrowers with fixed-rate debt benefit from inflation because they repay loans with dollars that are worth less in real terms than the dollars they borrowed. A homeowner with a 30-year fixed mortgage at 3% sees the real burden of that debt erode each year as inflation rises. Real estate owners generally benefit as property values and rents tend to rise with or faster than inflation. Commodity producers and owners of inflation-linked assets like TIPS also benefit. The people most harmed by inflation are those holding large amounts of cash, retirees on fixed incomes without COLA adjustments, and workers whose wages fail to keep pace with rising prices.
How do I protect my savings from inflation?
Protecting savings from inflation requires holding assets whose returns outpace the rate of price increase. Equities — stocks in diversified index funds — have historically produced returns well above inflation over long time horizons, making them the most effective long-term inflation hedge for most investors. Real estate, commodities, and Treasury Inflation-Protected Securities (TIPS) provide more direct inflation linkage. For cash savings, high-yield savings accounts and I-bonds — U.S. savings bonds whose interest rate is tied to CPI — offer the best inflation protection among liquid, low-risk options. Holding large amounts of cash in low-interest accounts for extended periods is one of the most reliable ways to lose real wealth slowly.
Tips for Inflation-Proofing Your Financial Plan
- Build inflation assumptions into every long-term projection. Any financial plan that projects future expenses, savings goals, or retirement income in today’s dollars without an inflation adjustment is systematically optimistic. Whether you’re projecting retirement needs 25 years out or a college fund 15 years away, apply an annual inflation rate to future expense estimates. The difference between an inflation-adjusted projection and a nominal one can easily reach six figures over a multi-decade planning horizon.
- Negotiate salary increases that beat inflation. A raise that matches inflation preserves your purchasing power; a raise that exceeds it builds it. Before salary negotiations, look up the current 12-month CPI rate from the Bureau of Labor Statistics. Frame your compensation conversation around maintaining and growing real income, not just nominal salary. An employer offering a 2% raise in a 4% inflation environment is effectively cutting your compensation — a fact worth raising explicitly.
- Use I-bonds for cash savings you won’t need for a year. Series I savings bonds issued by the U.S. Treasury pay an interest rate that adjusts every six months based on CPI inflation, providing a direct hedge against rising prices. They’re FDIC-equivalent in safety (backed by the U.S. government), earn competitive rates in high-inflation periods, and are exempt from state and local income taxes. The main limitation is a $10,000 annual purchase limit per person and a one-year minimum holding period. For medium-term cash savings you can set aside for at least a year, I-bonds are one of the most inflation-resistant tools available to individual investors.
- Review fixed expenses annually for inflation drift. Insurance premiums, subscription services, and utility costs tend to increase each year, often by more than general CPI. An annual audit of recurring expenses — comparing what you paid last year to what you’re paying now — reveals where inflation is hitting your personal budget hardest and where renegotiating, switching providers, or canceling may be warranted. Many people are paying 15–25% more for the same services than they were three years ago without having consciously agreed to the increases.
- Keep retirement income projections in real dollars. When modeling retirement income needs, express everything in today’s dollars and use a real rate of return — nominal return minus inflation — rather than mixing nominal projections with today’s-dollar expense estimates. Inconsistent inflation treatment is one of the most common errors in DIY retirement planning and consistently produces overly optimistic projections. If your investment return assumption is 7% nominal and inflation is 3%, your real return is approximately 4% — use 4% as your growth rate when projecting in today’s dollars.