📉 Inflation Calculator
Understand exactly how inflation has eroded purchasing power over the years. Convert any dollar amount between any years from 1913 to 2026 using historical CPI data, or project future purchasing power.
📖 How Inflation Erodes Purchasing Power
Inflation is the rate at which the general price level of goods and services rises over time, causing each dollar to buy less. The U.S. Federal Reserve targets 2% annual inflation as ideal for economic growth.
The Rule of 72 for Inflation
Divide 72 by the inflation rate to estimate how many years until prices double:
Years to Double = 72 ÷ Inflation Rate
At 3% inflation → prices double in ~24 years
💡 Beat Inflation with Investing
Cash in a savings account earning 0.5% while inflation runs at 3% means your real purchasing power shrinks by ~2.5% per year. Diversified investments in stocks have historically returned 7–10% annually, well above inflation.
📋 U.S. Inflation Rate by Decade
Historical annual CPI inflation data helps contextualize today's economic environment:
| Period | Avg Annual Inflation | Key Event | $100 Became |
|---|
| 1970s | 7.09% | Oil Crisis, Stagflation | $195 by 1980 |
| 1980s | 5.10% | Volcker Shock, Recovery | $165 by 1990 |
| 1990s | 3.00% | Dot-com boom, stability | $135 by 2000 |
| 2000s | 2.56% | Housing bubble, 2008 crisis | $129 by 2010 |
| 2010s | 1.76% | Post-recession low inflation | $119 by 2020 |
| 2020–2024 | 4.90% | COVID-19 supply shocks | $127 by 2025 |
| 2025–2026 (est.) | 2.8% | Stabilization period | ~$106 by 2027 |
❓ Frequently Asked Questions
What is inflation in simple terms? −
Inflation is the gradual increase in prices over time, which means each dollar buys less than it used to. For example, a grocery cart that cost $100 in 2000 costs about $180 today. It's measured by the Consumer Price Index (CPI), which tracks price changes of a typical 'basket' of goods and services.
What causes inflation? +
The main causes are: (1) Demand-pull inflation — too much money chasing too few goods; (2) Cost-push inflation — rising production costs (labor, materials, energy) passed on to consumers; (3) Built-in inflation — wage-price spiral where workers demand higher wages due to higher prices. The 2021–2023 inflation surge was caused by COVID supply chain disruptions combined with massive fiscal stimulus.
What is the Federal Reserve's inflation target? +
The Federal Reserve targets 2% annual inflation as measured by the Personal Consumption Expenditures (PCE) index. This is considered optimal — low enough to maintain purchasing power, but high enough to prevent deflation, which can lead to economic stagnation.
How does inflation affect savings and investments? +
Cash savings lose real value over time when inflation exceeds interest rates. At 3% inflation with 0.5% savings rate, you lose ~2.5% purchasing power annually. Investments in stocks historically outpace inflation (7–10% avg returns). TIPS (Treasury Inflation-Protected Securities) and I-bonds are designed to keep pace with inflation.
What was the highest US inflation rate ever? +
The all-time high was during World War I peak of ~20% in 1917-1918. In modern history, inflation peaked at 14.8% in March 1980 during the stagflation era. The most recent spike reached 9.1% in June 2022 — the highest since 1981 — driven by pandemic supply shocks and energy prices.