Inflation Calculator
What this calculator does
This calculator shows how inflation affects the purchasing power of money over time. Enter a dollar amount and two years, and it calculates what that amount is worth in today's dollars (or any target year), using the Consumer Price Index (CPI) as the measure of inflation.
Inflation is the gradual increase in the general price level of goods and services. A dollar today buys less than a dollar ten years ago, and understanding this erosion is essential for financial planning, salary negotiation, investment analysis, and historical comparisons. When someone says a house cost $30,000 in 1970, this calculator tells you that is equivalent to roughly $240,000 in 2024 dollars.
This tool is useful for anyone comparing prices across time periods, evaluating whether a raise kept up with inflation, projecting future costs, or understanding the real (inflation-adjusted) return on investments.
How to use it
- Enter the dollar amount (e.g. $100).
- Enter the starting year (e.g. 2000).
- Enter the ending year (e.g. 2024).
- Review the equivalent value, total inflation rate, and average annual inflation rate over the period.
Formulas used
CPI-based adjustment: Adjusted value = Original amount × (CPI in ending year / CPI in starting year) Example: $100 in 2000 → $100 × (314.2 / 172.2) = $182.46 in 2024 dollars.
Total inflation rate: Total % = ((CPI end / CPI start) − 1) × 100 Example: (314.2 / 172.2 − 1) × 100 = 82.5% total inflation from 2000 to 2024.
Average annual inflation rate: Annual % = ((CPI end / CPI start)^(1/years) − 1) × 100 Example: (314.2 / 172.2)^(1/24) − 1 = 2.53% per year.
Future purchasing power (projection): Future value needed = Current amount × (1 + Inflation rate)^Years Example: To match $50,000 today in 20 years at 3% inflation: $50,000 × 1.03^20 = $90,306.
Examples
Example 1 — Historical comparison: $50,000 salary in 2010 → equivalent to approximately $72,000 in 2024. If your salary has not grown by 44%, your purchasing power has declined.
Example 2 — Purchasing power erosion: $1,000,000 retirement savings today. At 3% annual inflation, in 25 years it has the purchasing power of approximately $477,000 in today's dollars.
Example 3 — Historical prices: A movie ticket cost $4.25 in 1990. In 2024 dollars: $4.25 × (314.2 / 130.7) = $10.21. Average movie ticket prices in 2024 are about $10–11, confirming the adjustment.
Tips and common mistakes
- CPI measures a basket of goods. It represents the average consumer's experience, but your personal inflation rate may differ. Housing, healthcare, and education have inflated faster than the overall CPI; electronics and clothing have deflated.
- Nominal vs. real returns. An investment returning 8% in a year with 3% inflation has a real return of approximately 5%. Always think in inflation-adjusted terms for long-term planning.
- Salary stagnation is hidden inflation. If your pay does not increase by at least the inflation rate each year, you are effectively taking a pay cut. Use this calculator to quantify the gap.
- Historical CPI data is published by the U.S. Bureau of Labor Statistics (BLS). This calculator uses CPI-U (All Urban Consumers), the most commonly cited measure.
- Projection is not prediction. Future inflation rates are uncertain. Historical US average is ~3%, but individual years range from -1% to 14%+. Use projections as scenarios, not guarantees.
- Different countries have different inflation rates. This calculator defaults to US CPI. Other countries publish their own consumer price indices.