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Know the real cost of time. Enter an amount, inflation rate, years and direction to estimate future cost or past purchasing power.
Future buying power equals the present amount divided by (1 + the inflation rate) raised to the number of years. At 3% inflation, $100,000 in ten years has buying power similar to about $74,400 today. After twenty years it is about $55,400. The free StockEducation Inflation Calculator works in both directions. It can show what a future amount may buy or what an earlier price would equal now. Inflation differs by time, place and spending category, so your household costs may rise faster or slower than the published headline rate.
Enter an amount, rate, timeframe and direction to calculate future cost or past value.
General education only — check the assumptions before using the result.
Purpose: This calculator is a general educational tool that performs a numerical calculation from the values you enter. It does not recommend, advertise or promote a specific financial product.
Assumptions: The calculation uses the input values and assumptions displayed in the calculator. Default values are illustrative starting points, not forecasts. Change each non-statutory assumption so it matches the scenario you want to test.
Limitations: Actual market returns, prices, dividends, interest rates, fees, tax, inflation and timing may differ from the assumptions. The calculator may omit factors relevant to you. Small input changes can materially change the result, so the output is an illustration rather than a prediction.
This financial calculator is not intended to be relied on for the purposes of making a decision in relation to a financial product. You should consider obtaining advice from a financial services licensee before making any financial decisions.
You can print this page or save it electronically using your browser controls. See ASIC Instrument 2026/41 for the conditions applying to generic financial calculators.
Disclaimer · Terms of Use
Educational content only. Projections use a constant annual inflation rate and are estimates only. Actual inflation varies year to year and differs across spending categories such as housing, food and healthcare.
$1,000 today at 3% annual inflation becomes $1,344 in 10 years, $1,806 in 20 years, and $2,427 in 30 years. Cumulative inflation compounds at the same rate as investment returns, which is why purchasing power decay is the silent enemy of long term savings. Use the calculator to convert nominal projections to real terms.
Future cost or past purchasing power from any starting amount.
The dollar value you want to convert. Could be a target savings goal, a planned expense, or a historical price.
Long run developed market average is 2.5 to 3%. Recent periods have seen materially higher and lower; check current data.
The result panel shows the Projected Future Cost (or past value), Cumulative Inflation %, the Direction toggle, a Price Path Over Time chart, an Inflation Summary, and a Year-by-Year Breakdown table. Cumulative inflation is what most people underestimate — 3% per year for 30 years compounds to a 143% price increase, not 90%.
A four-stage written walkthrough — the chapters a video would cover, available now in text.
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4 min watch. Auto captions available. Walkthrough chapters listed above.
Specific outcomes, not generic claims.
$1M nominal in 30 years sounds like a lot. At 3% inflation it has the purchasing power of roughly $412k today. Inflation is the silent enemy of long term plans.
Most calculators give nominal numbers. The inflation calculator translates them to today’s dollars so you can plan in real purchasing power.
Use the past value direction to translate historical prices to today’s dollars. Useful for context on long run cost trends.
Most calculators hide the formula. We show it because understanding the math is the point.
Future and past inflation are inverse operations of the same compounding formula.
Present
rate
years
Future Cost
Past Value
The projection is a mathematical model, not a forecast. Six assumptions baked into the math, plus what real outcomes look like.
Each card pairs an assumption the calculator makes with what real world investing actually looks like.
Reality: Real inflation varies year to year. Long run averages mask significant short term spikes and dips.
Reality: Different cost categories (healthcare, housing, education) inflate at different rates than the CPI average.
Reality: CPI baskets are average representations. Your personal inflation may differ based on what you buy.
Reality: Inflation varies by city, country and region. Use local CPI if available.
Reality: Past inflation is observed; future is uncertain. Treat forward projections as planning estimates.
Reality: Inflation affects different demographics differently. Retirees on fixed incomes face it most acutely.
Same base scenario, one variable changed at a time. The projection is highly sensitive to small changes.
The calculator assumes a smooth return every year. Here is how that compares to verified historical data.
Written by Dr. Charles Lo, Associate Professor, CPA. Reviewed annually.
Inflation is the rate at which the general level of prices rises, reducing the purchasing power of a fixed amount of money. The standard measure is the Consumer Price Index (CPI), which tracks a basket of goods and services that an average household buys.
Mathematically, inflation compounds in the same way as investment returns. A 3% annual inflation rate produces 34% cumulative inflation over 10 years (not 30%), because each year’s inflation is applied to a base that already includes the prior years’ inflation.
The most important practical implication is for long horizon planning. A retirement target of $1M in 30 years at 3% inflation has the purchasing power of roughly $412k today. Either plan in nominal terms (and accumulate $1M) or plan in real terms (and target the equivalent $412k worth of stuff). Mixing the two leads to under or over saving.
Use 2.5 to 3% as the default long run developed market average. Use higher if you live in a higher inflation country or want to plan conservatively. Check current published CPI from your central bank or statistics office for shorter horizon planning.
For US planning, BLS CPI is the standard. For Australia, ABS CPI. For UK, ONS. Each publishes monthly and annual figures going back decades.
Read the future cost number. This is what you would need in future dollars to buy what your input buys today. If a $50,000 car costs roughly $90,000 in 20 years at 3% inflation, your savings plan needs to target $90,000 nominally to actually buy the car.
Read cumulative inflation. This percentage tells you how much purchasing power has been lost between the two points in time.
Real numbers calculated from the same formula as the live tool. Every figure below is verified, not approximated.
$1,000 today, 3% rate, 10 years, future cost
Standard projection of how much $1,000 worth of goods will cost in 10 years.
$500,000 retirement target, 3% rate, 30 years
Translating today’s purchasing power retirement goal to nominal dollars needed.
$100 today, 3% rate, 50 years ago
What was $100 worth in 1976 dollars? Useful for understanding historical context.
$10,000 today, 5% rate, 20 years
Stress testing what happens if inflation runs above long run average for two decades.
$75,000 salary today, 2.5% wage growth, 30 years
How a flat wage compares to 30 years of typical wage growth.
The questions users most often ask about calculator output.
Yes. Free to use, no signup. Your inputs are not stored or shared.
Long run developed market average is 2.5 to 3%. Use higher (3.5 to 4%) for conservative long term planning or if you live in a higher inflation country.
Both compound the same way mathematically. Interest is what you earn on money invested. Inflation is the rate at which money loses purchasing power.
Nominal is the headline dollar figure without inflation adjustment. Real is purchasing power, adjusted to a specific year’s dollars. Real numbers are what you can actually buy.
CPI is an average across many categories. Healthcare, education and housing have historically inflated faster than CPI. Retirees particularly face healthcare inflation.
Yes. Deflation (falling prices) has happened in Japan and during severe recessions. The calculator handles negative rates if you input them.
Use it to convert any nominal projection (from the compound interest or retirement calculator) to real purchasing power. This is essential for long horizon planning.
The calculator uses the rate you specify. For historical CPI, use BLS (US), ABS (Australia), ONS (UK) or your local central bank for actual published figures.
Other tools for different parts of your financial picture.
The calculator uses the standard compound inflation formula. Historical inflation data references official sources from major central banks and statistics offices.
This calculator is provided for general educational purposes only. It does not constitute financial product advice. Historical inflation does not predict future inflation. Personal inflation may differ from CPI based on what you buy and where you live. Consult a financial planner for inflation specific planning advice.
This calculator gives you the number. Our free courses teach you the why behind the math, the assumptions to question, and how to apply it to your own portfolio.
Enter amount, rate, years and direction. See future cost, past value, cumulative inflation and year by year breakdown.
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