Inflation Calculator — Historical CPI Data
Calculate the inflation-adjusted value of any dollar amount from 1913 to today using official US CPI data from the Bureau of Labor Statistics. See cumulative and average annual inflation rates.
Inflation Calculator
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CPI in 2026 (Bureau of Labor Statistics)
324.0
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$100.00 in 1913 had the same purchasing power as $3,272.73 in 2026. That's a price increase of $3,172.73 (3172.7% inflation) over 113 years.
Based on US CPI-U (All Urban Consumers) annual averages published by the Bureau of Labor Statistics.
Purchasing Power of $100.00 Over Time
Equivalent purchasing power of $100 from 1913 over time
Inflation by Period
| Period | Total Inflation | Avg Annual Rate |
|---|---|---|
| 1913–1920 | +102.0% | 10.57%/yr |
| 1920–1930 | -16.5% | -1.79%/yr |
| 1930–1940 | -16.2% | -1.75%/yr |
| 1940–1950 | +72.1% | 5.58%/yr |
| 1950–1960 | +22.8% | 2.08%/yr |
| 1960–1970 | +31.1% | 2.74%/yr |
| 1970–1980 | +112.4% | 7.82%/yr |
| 1980–1990 | +58.6% | 4.72%/yr |
| 1990–2000 | +31.8% | 2.80%/yr |
| 2000–2010 | +26.7% | 2.39%/yr |
| 2010–2020 | +18.7% | 1.73%/yr |
| 2020–2026 | +25.2% | 3.82%/yr |
The Formula
The adjusted value is calculated by dividing the original amount by the starting CPI, then multiplying by the ending CPI. This converts the dollar value based on actual Bureau of Labor Statistics data. The result tells you how much money you would need in the target year to have the same purchasing power as the original amount had in the starting year.
Variable Definitions
Starting CPI
Consumer Price Index in the starting year, sourced from official Bureau of Labor Statistics annual average data. This reflects the general price level in the economy at the time the original amount was valued.
Ending CPI
Consumer Price Index in the target year, also from BLS data. The ratio CPI₂/CPI₁ directly measures the cumulative inflation that occurred between the two years.
Consumer Price Index
A measure of the average change in prices paid by urban consumers for a market basket of goods and services. The CPI basket includes food, housing, energy, transportation, medical care, education, and recreation weighted by typical consumer spending patterns.
Total Price Change
The percentage change in CPI from the starting year to the target year. If cumulative inflation is 50%, it means prices overall have increased by 50% — so $100 buys what $66.67 bought before.
Real Buying Power
The real value of money after adjusting for inflation. At 3% annual inflation, $100 loses half its purchasing power in roughly 24 years. This erosion is exponential, making early retirement planning critical for maintaining lifestyle.
How to Use This Calculator
- 1
Enter a dollar amount and select the starting year when that amount had its original purchasing power.
- 2
Select the target year to see the inflation-adjusted equivalent based on official BLS CPI data.
- 3
Review the cumulative and average annual inflation rates to understand how price levels changed over the selected period.
Common Applications
- Calculate how much a dollar amount from a past year is worth today after accounting for cumulative inflation using official CPI data.
- Project the future purchasing power of your savings to understand how inflation erodes your retirement nest egg over time.
- Compare the cumulative and average annual inflation rates between any two years from 1913 to the present.
Inflation erodes purchasing power exponentially over time - at 3% annual inflation, the value of money halves approximately every 24 years
Understanding the Concept
The Consumer Price Index (CPI) is published monthly by the US Bureau of Labor Statistics. It tracks the price of a fixed "basket" of goods and services — food, housing, clothing, transportation, medical care, and more. This calculator uses annual average CPI values from 1913 to present. The math is straightforward: if prices in year B are 50% higher than in year A, then $100 in year A has the same purchasing power as $150 in year B. InflationThe rate at which the general level of prices rises, reducing purchasing power over time. Measured by indices like CPI. is often called the "silent thief" because it slowly erodes purchasing power over time without people noticing. At 3% average annual inflation, $100 loses half its purchasing power in about 24 years. This has profound implications for retirement planning: a retiree who needs $40,000/year today will need approximately $80,000/year in 24 years just to maintain the same standard of living.
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