A constant-rate scenario, not a forecast. Actual prices do not rise evenly.
Calculation details
Planning estimate only, not financial, tax, or legal advice. Verify assumptions and current rules before making decisions.
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Use this result
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What does this calculator estimate?
An inflation impact calculator shows how inflation changes money's value over time. Enter an amount, inflation rate, and years to see the future cost and lost purchasing power.
- Future cost = amount × (1 + r)^years
- Purchasing power = amount ÷ (1 + r)^years
- 3% inflation halves buying power in ~24 years
How inflation erodes money
Inflation is the rise in prices over time: the same money buys less. Compounding matters — at 3% annual inflation, prices double roughly every 24 years, and cash that earns no interest loses real value at that rate.
Limitations to watch for
The average rate hides uneven price changes — healthcare and housing often rise faster than the overall index. The projection assumes a constant rate; real inflation varies year to year. Assets like stocks and real estate can outpace inflation; cash generally doesn't.
How to use it in practice
Use it to estimate what future expenses will cost (college, retirement, big purchases) and to check whether your savings rate beats inflation. A 'real' return is the nominal return minus inflation.
- Enter the current amount.
- Enter an inflation assumption (2–4% typical).
- Enter the years; read the future cost and lost purchasing power.
What inflation does to money
Inflation erodes purchasing power: $10,000 today buys what about $13,400 buys in 10 years at 3 percent inflation. The calculator converts current money into its future equivalent and future money back into today's dollars.
The real return
A savings account earning 4 percent while inflation runs 3 percent has a 1 percent real return. The calculator's real-value view separates the nominal growth from the purchasing-power change.
Planning with inflation
Retirement and long-term goals should use real returns (return − inflation). A 7 percent nominal return with 3 percent inflation is 4 percent real — the difference compounds over decades. The calculator makes the adjustment explicit.
A worked example
$50,000 in 20 years at 3 percent inflation is worth about $27,700 in today's dollars. To maintain $50,000 of today's purchasing power, the account needs about $90,300 nominal. The calculator shows both directions.
Inflation varies by basket
Headline inflation (CPI) is an average; healthcare, education, and housing often inflate faster. Planning with a category-specific rate (e.g., 5 percent for healthcare) is more honest for those goals.
How this calculator works
Formula
Future cost = amount × (1 + rate)^years. Purchasing power = amount ÷ (1 + rate)^years. Price increase = amount × ((1 + rate)^years − 1).
Worked example
$1,000 at 3% inflation for 20 years: future cost ≈ $1,806, so the purchasing power of $1,000 today falls to about $554.
Assumptions to verify
- A constant inflation rate over the period.
- No interest or investment growth is modeled on the amount.
- The CPI-like average reflects the user's spending.
Frequently asked questions
What is inflation?
The general rise in prices over time, which reduces what each dollar can buy. It's usually measured by the Consumer Price Index (CPI).
How do I calculate inflation's impact?
Future cost = amount × (1 + rate)^years. $1,000 at 3% for 20 years costs about $1,806; its purchasing power falls to ~$554.
How fast does inflation halve money's value?
At 3%, about 24 years (the rule of 72: 72 ÷ 3). At 6%, about 12 years.
What is purchasing power?
What your money can actually buy — it falls as prices rise. $1,000 today buys less in the future at any positive inflation.
What's a 'real' return?
Your investment return minus inflation: 7% nominal with 3% inflation is a 4% real gain.
Should I keep cash in a savings account?
Cash that earns less than inflation loses real value — that's why long-term savings typically go into investments.
Is inflation always bad?
Moderate inflation is normal in a growing economy; deflation (falling prices) has its own problems. The issue is when it outpaces your income and savings growth.
How does inflation affect my money?
It reduces purchasing power: $10,000 at 3% inflation buys ~$13,400-worth in 10 years... or rather needs $13,400 to buy the same.
What is real return?
Nominal return minus inflation — the actual growth in purchasing power.
How do I plan for inflation?
Use real returns for long-term goals and category-specific rates where they apply.
Is 3% inflation a good assumption?
It is the Fed's target; category rates can run higher for healthcare and education.
Cite this tool
BoringToolsKit. “Inflation Impact Calculator.” boringtoolskit.com/inflation-impact-calculator/ (reviewed 2026-08-25). Free to reference in articles, syllabi, and answer posts with a link.
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