What is inflation and how does it affect purchasing power?
Inflation is the general rise in prices over time, which means the same amount of money buys less in the future than it does today. Purchasing power is the reverse side of the same coin — as prices rise, each dollar buys a smaller basket of goods and services. A salary that feels generous today may feel tight ten years from now if wages do not keep pace with inflation.
How do you calculate inflation between two years?
Inflation between two years is calculated from the Consumer Price Index (CPI). Find the CPI for the earlier year and the later year, then compute the ratio. The percentage increase is the total inflation over that period. Our calculator does this automatically using annual CPI-U averages published by the Bureau of Labor Statistics going back to 1913.
What is the Consumer Price Index (CPI) formula?
The inflation formula is: Adjusted value = Original value × (CPI in target year / CPI in base year). To find the percentage: Inflation % = (CPI target − CPI base) / CPI base × 100. The annualized rate (CAGR) is: (CPI target / CPI base)^(1/years) − 1, which expresses compounded average inflation per year across the period.
What are some real inflation examples?
$1 in 1990 vs 2024: US CPI was 130.7 in 1990 and 313.7 in 2024. $1 × (313.7 / 130.7) ≈ $2.40. Prices roughly 2.4× higher; total inflation ≈ 140%.
$50,000 salary in 2000 vs 2024: CPI was 172.2 in 2000 and 313.7 in 2024. Equivalent today: $50,000 × (313.7 / 172.2) ≈ $91,100. To maintain purchasing power you would need to earn roughly that much today.
When is an inflation calculator useful?
Inflation-adjust historical salaries to compare job offers across years, evaluate long-term investment returns in real terms (nominal gains minus inflation), check whether a pension or annuity keeps pace with the cost of living, understand "how much would this cost today" for historical purchases, and plan retirement withdrawals against likely future price levels. Pair it with our compound growth calculator to see how investment returns compare with erosion from inflation.
What is the difference between nominal and real values?
Nominal values are stated in the money of the day — the dollar amount on an old paycheck or receipt. Real values are adjusted for inflation, letting you compare purchasing power across time on equal footing. A $40,000 salary in 1995 is nominally smaller than a $60,000 salary today, but in real terms they may represent similar purchasing power. Use real values when comparing prices, wages, or returns across different eras.
Why have prices risen more for some items than others?
The CPI is an average across a broad basket — housing, food, transportation, healthcare, education. Individual categories diverge sharply: healthcare and college tuition have outpaced overall CPI for decades, while consumer electronics and clothing have risen more slowly or even fallen. Your personal inflation rate may differ from the headline number depending on what you spend on. If you are comparing salary growth, our salary-to-hourly calculator helps you see real per-hour pay across different work schedules.