Inflation Calculator
See how inflation erodes your purchasing power over time. Calculate the future cost of goods and the real value of your money after inflation.
An inflation calculator tells you what a dollar today will actually buy in 5, 10, or 30 years — and what price tag today's purchases will carry in the future. Inflation is the slow, quiet tax that erodes every saver's purchasing power, and unless your wages and investments outrun it, you grow poorer while your account balance grows. Our free inflation calculator runs the standard compound-inflation formula, FV = PV × (1 + r)^t, so you can see both the future cost of today's $100,000 lifestyle and the today's-dollar value of any future sum.
In the United States, inflation is measured primarily by the Consumer Price Index (CPI) published monthly by the Bureau of Labor Statistics. Economists also watch core CPI, which strips out volatile food and energy prices, and the PCE deflator, which the Federal Reserve uses for its 2% target. The long-run US average since 1913 sits near 3.2%, but actual years have ranged from deflation (−10% in 1921) to 13.5% (1980) to 9.1% (June 2022). At a steady 3%, prices double every ~24 years and quadruple every ~48 — meaning a $50,000 lifestyle today costs roughly $100,000 at retirement 24 years from now, and $200,000 if you live another 24 after that.
This calculator matters most for retirees on fixed incomes, FIRE planners building multi-decade withdrawal plans, savers evaluating whether a 4% high-yield savings account actually beats inflation, and anyone comparing salary offers across decades. It's an education tool, not financial advice.
Quick answer: At the US historical average 3% inflation rate, $100,000 today will only have the purchasing power of about $55,368 in 20 years — you'd need roughly $180,611 then to buy what $100,000 buys now. This inflation calculator shows future equivalent cost and today's-dollar purchasing power for any amount, rate, and horizon.
Inputs
Quick presetsAny dollar figure in today's money — a salary, lifestyle cost, retirement target, or price tag you want to project forward or backward.
US historical average is ~3%. 2022-2024 saw 4-9%. Pick a range, not a point.
How far forward to project. Retirement planning typically uses 20-40 years; short-horizon budgeting uses 1-5.
Results
How to use this calculator
The tool takes three inputs. **Current amount** is any dollar figure you want to translate forward or backward in time: today's salary, the price of a car, your planned retirement spending, or a future goal. **Inflation rate** is the assumed average annual rate over your horizon — the US historical long-run average is about 3%, the Fed's explicit target is 2%, and prudent retirement planning often assumes 3–3.5% to stay conservative. In high-inflation periods like 2022, short-term assumptions might run 5%+, but projecting decades at those rates usually overstates the long-term drag.
**Time period** in years is how far forward or backward you want to project. Once you hit Calculate, you get three outputs: the future equivalent cost (what $100,000 of today's goods will cost in the future), the purchasing power loss (the gap between the two), and the effective value today (what a future $100,000 is worth in today's dollars). Flip that third number against projected investment balances to see real returns net of inflation — the only number that actually matters for living standards.
Worked examples
Retirement lifestyle cost in 30 years
Jennifer, 35, currently spends $80,000/year and plans to retire at 65 with a similar lifestyle. Entering $80,000, 3% inflation, 30 years, the calculator shows that identical basket of goods will cost about $194,000 in year-30 dollars — more than double. Put differently, the future $80,000 number printed on her pension statement will only buy about $33,000 of today's lifestyle. This is exactly why FIRE planners and retirement calculators should either work in real (inflation-adjusted) dollars or explicitly inflate future spending targets. Ignoring inflation makes a seemingly comfortable $1M nest egg feel shockingly thin 30 years out.
The hidden cost of holding cash
Kevin, nervous about the stock market, parks $50,000 in a checking account earning 0% for 10 years. Entering $50,000, 3% inflation, 10 years, the calculator shows the effective value today of that $50,000 in 10 years is only about $37,200 — a $12,800 loss of purchasing power despite the nominal balance never dropping. Even in a 4.5% high-yield savings account, he'd net just 1.5% real, turning $50,000 into roughly $58,000 of today's-dollar value. Historical stocks at 7% real would grow the same $50,000 to roughly $98,000 in today's dollars — a $40,000 gap driven entirely by keeping pace with (or beating) inflation.
Stress-testing a 2022-style inflation shock
Priya, a 28-year-old engineer, wants to know what happens if the 2022-2024 5% inflation environment persists for a decade instead of reverting to 3%. Entering $120,000 (her current all-in annual spending), 5% inflation, 10 years, the calculator shows that same lifestyle will cost about $195,500 in year-10 dollars — a 63% jump vs. just 34% at 3% inflation. Flip it the other way: her today's $120,000 will only buy the equivalent of $73,700 of today's lifestyle if she hoards it in cash for a decade. The lesson is that a 2-point difference in assumed inflation compounds into a $60,000+ annual budgeting gap over a single decade, which is why stress-testing retirement plans at 4-5% inflation — not just the historical 3% — is prudent for anyone under 40.
Frequently asked questions
What's the difference between CPI and core CPI?
Headline CPI measures a basket of ~80,000 goods and services; core CPI excludes food and energy because their prices swing violently on weather and geopolitics. The Fed and most economists focus on core CPI and the PCE deflator for underlying inflation trends. For retirement planning, headline CPI is usually the right yardstick since retirees actually buy food and gas.
Nominal vs. real — what's the difference?
Nominal is the dollar amount printed on the paper; real is that amount adjusted for inflation. A 7% nominal return with 3% inflation equals a 4% real return — the real number is what determines whether your lifestyle improves. Always compare investment returns and wage growth in real terms for apples-to-apples.
What's the historical average US inflation rate?
About 3.2% per year since 1913 when the CPI series began. Post-1990 averages closer to 2.5%. Recent memory is distorted: 2012–2020 averaged ~1.8%, then spiked to 9.1% in June 2022 before cooling to the 2–3% range. For multi-decade planning, 3% is a sensible central assumption.
Why does inflation erode fixed incomes so badly?
A pension paying $50,000/year without a cost-of-living adjustment has the purchasing power of only $37,200 after 10 years at 3% inflation, and just $27,700 after 20 years. That's why Social Security's COLA and TIPS-style inflation indexing matter enormously to retirees — a fixed nominal income is a decreasing real income, guaranteed.
What are TIPS and how do they help?
Treasury Inflation-Protected Securities are US government bonds whose principal value adjusts with CPI. If inflation is 3%, the principal grows 3% that year and interest is paid on the higher balance. They lag in deflation but are a direct hedge against unexpected inflation. I-Bonds are the retail cousin with a purchase cap of $10,000/year per person.
What about hyperinflation?
Hyperinflation (100%+ annual) is historically rare in the US — the worst post-war year was 1980 at 13.5%. Weimar Germany (1923), Zimbabwe (2008), and Venezuela (2018) are textbook cases driven by money-printing to finance government debt. Diversifying into real assets (real estate, commodities, global equities) is the standard hedge against tail-risk currency collapse.
Why must FIRE numbers be inflation-adjusted?
A FIRE target of $2.5M assumes today's $100,000 lifestyle at a 4% withdrawal rate. If you won't retire for 20 years and inflation averages 3%, you'll actually need about $4.5M of nominal dollars on retirement day to fund the same lifestyle. Either plan in real dollars end-to-end, or explicitly inflate both the target and the projected savings.
Should I use the Rule of 72 for inflation?
Yes — divide 72 by the inflation rate to estimate doubling time of prices. At 3%, prices double in 24 years; at 6%, in 12 years; at 9%, in 8 years. This is the fastest mental math for grasping long-horizon erosion without opening a spreadsheet.