$1.00 today grows to a $28.10 in 35 years — Compared to today's purchasing power its $14.05.
Pro Tips
- → True cost of retirement spending: Set the amount to $1 to see its real value at retirement. At 10% growth over 35 years, $1 today grows to ~$28 nominally — every dollar you spend now carries that hidden price tag in forgone future wealth.
- → Nominal vs. real value: The green figure is your future dollar amount; the blue is what it's worth in today's purchasing power. Always plan retirement income using the real (blue) number — nominal figures overstate your actual buying power.
- → Compare growth rates: Run the calculator twice — once with a savings account rate (~4%) and once with a market rate (~10%). The gap over 35 years is staggering and makes the case for investing over hoarding cash.
- → Rule of 72: Divide 72 by your real growth rate to estimate how many years until your purchasing power doubles. At 10% nominal growth and 2% inflation your real rate is ~7.8%, meaning real wealth roughly doubles every 9 years.
Quiz prep
Key ideas to know
For the Inflation Quiz
- Money that grows slower than prices loses buying power. If savings earn 1% while prices rise 3%, the balance goes up but each dollar buys less.
- Nominal value is the number on your statement; real value is what it buys. Real value adjusts for inflation, so plan retirement income with the real number.
- The CPI tracks the average change in prices for a broad basket of goods and services. This calculator uses CPI-U data from the U.S. Bureau of Labor Statistics.
- Convert old dollars with a CPI ratio. Multiply by the later CPI ÷ the earlier CPI: if the CPI goes from 100 to 200, $50 becomes $50 × 200 ÷ 100 = $100.
- Your own inflation rate can differ from the CPI. The CPI is an average for urban consumers; yours depends on what you buy and where you live.
How the What Is a Dollar Worth Calculator works
This calculator answers two questions. In historical mode, it shows what an amount from one year is worth in another year’s dollars, using official inflation data. In future mode, it projects what money could grow to and shows that value both before and after inflation.
Who it's for
- Anyone comparing a price, salary, or savings balance across different years.
- Savers who want to see how inflation erodes cash sitting idle.
- Investors comparing a nominal return with what it’s worth after inflation.
Inputs and assumptions
- Amount
- The dollar amount you want to compare.
- From year and to year (historical mode)
- Any two years from 1913 through 2025.
- Years (future mode)
- How far ahead to project, from 1 to 100 years.
- Growth rate (future mode)
- The nominal annual return you expect, from 0% to 50%.
- Inflation rate (future mode)
- The annual inflation you expect, from −5% to 30%.
Methodology
- Historical: amount × CPI in the later year ÷ CPI in the earlier year, using CPI-U annual averages (1982–84 = 100) from the Bureau of Labor Statistics.
- Future: the nominal value is amount × (1 + growth)years; the real value uses the inflation-adjusted rate (1 + growth) ÷ (1 + inflation) − 1.
Full formulas for every tool are on our calculator methodology page.
Worked example
$1 in 1980 (CPI 82.4) had the same purchasing power as about $3.88 in 2025 (CPI 319.6), and $100 in 2000 is about $185.60 in 2025 dollars. Looking ahead, $1 growing at 10% a year for 35 years becomes about $28.10, or about $14.05 in today’s dollars if inflation averages 2%.
Limitations
- CPI measures average price changes for urban consumers; your own inflation rate depends on what you buy and where you live.
- Historical mode uses annual averages, so it won’t match a specific month’s prices.
- Future mode assumes constant growth and inflation every year.
Frequently asked questions
What is CPI-U?
The Consumer Price Index for All Urban Consumers, published by the U.S. Bureau of Labor Statistics. It tracks the average change in prices paid for a broad basket of goods and services.
What’s the difference between nominal and real value?
Nominal value is the dollar amount on your statement. Real value adjusts for inflation, showing what that money can actually buy in today’s dollars.
Why does cash lose value over time?
When prices rise, each dollar buys less. Money earning less than the inflation rate loses purchasing power even though the balance never goes down.
Disclaimer: This tool provides estimates for general education. It isn't financial, investment, tax, or legal advice, and it can't account for everything about your situation. Consider talking with a qualified professional before making major financial decisions.