📉 Finance & Investment
Inflation Calculator
See how inflation erodes purchasing power over time. Enter any dollar amount, adjust the rate, and see exactly how much more (or less) that money is worth today. Free, instant, no signup.
What Is Inflation and Why Does It Matter?
Inflation is the rate at which the general price level of goods and services rises over time, effectively reducing the purchasing power of money. A dollar today buys less than a dollar did 10 years ago — and will buy less than a dollar tomorrow.
Inflation is measured by the Consumer Price Index (CPI), which tracks price changes across a basket of common goods and services including food, housing, transportation, and healthcare.
Future Value = Present Value × (1 + inflation rate)^years
Real Value = Nominal Value / (1 + inflation rate)^years
Example: $100,000 × (1.03)^20 = $180,611 needed in 20 years
to maintain the same purchasing power at 3% inflation
Historical US Inflation Rates
Understanding historical inflation gives context for projections. Here are notable periods in US inflation history:
- 1970s: High inflation decade, peaking at ~14% in 1980 during the energy crisis
- 1990s–2010s: "Great Moderation" — inflation largely stable between 1–3%
- 2021–2022: Post-pandemic inflation surge, peaking at 9.1% in June 2022 (40-year high)
- 2023–2024: Inflation moderated back toward the Fed's 2% target
- Long-run average since 1913: Approximately 3.2% per year
The Federal Reserve's official target is 2% annual inflation. This is considered the sweet spot: enough inflation to discourage hoarding and encourage spending, but low enough to preserve purchasing power.
How Inflation Destroys Savings in Low-Yield Accounts
This is where inflation's impact is most devastating for ordinary savers. If your savings account earns 0.5% annually while inflation runs at 3%, your money's real purchasing power decreases by approximately 2.5% every year.
$100,000 earning 0.5% for 20 years grows to $110,486 in nominal terms. But at 3% inflation, you'd need $180,611 to maintain the same purchasing power. Your "real" wealth has declined by roughly $70,000 — even though your account balance grew.
💡 The Rule of 72 for InflationDivide 72 by the inflation rate to find how many years it takes for prices to double (and purchasing power to halve). At 3% inflation: 72 ÷ 3 = 24 years. At 6%: only 12 years.
How to protect against inflation
- Stock market investing: Historically outpaces inflation by 7%+ annually
- Real estate: Property values and rents tend to rise with inflation
- TIPS (Treasury Inflation-Protected Securities): Principal adjusts with CPI
- I-Bonds: Government savings bonds with interest tied to inflation rate
- High-Yield Savings Accounts: At minimum, earn more than 0% on your cash
- Commodities: Gold and oil often rise during inflationary periods
Frequently Asked Questions
What is the difference between inflation and deflation?
Inflation is rising prices (falling purchasing power of money). Deflation is falling prices (rising purchasing power). While deflation sounds beneficial, it is dangerous for economies because it encourages people to delay purchases, leading to reduced economic activity and potentially a deflationary spiral.
How does the Fed control inflation?
The Federal Reserve primarily controls inflation through interest rates. Raising rates makes borrowing more expensive, reducing spending and investment, which slows economic activity and cools inflation. Lowering rates has the opposite effect, stimulating the economy but potentially fueling inflation.
What inflation rate should I use for retirement planning?
Most financial planners use 2.5–3% as a conservative long-run inflation assumption for retirement planning. For healthcare expenses specifically, which inflate faster than general CPI, using 4–5% is more prudent. The 3% general assumption is widely considered reasonable for 20–30 year projections.