Calcs for Life

CPI Inflation Calculator

What a dollar amount from one month is worth in another, using the official Consumer Price Index (CPI-U) back to 1913.

CPI data through September 2026

$

$100.00 in January 2000 has the same buying power as

$199.61

in September 2026

CPI, January 2000
168.8
CPI, September 2026
336.94
Cumulative price change
99.6%
Average annual inflation
2.63%
2000: $1002001: $1042002: $1052003: $1082004: $1102005: $1132006: $1172007: $1202008: $1252009: $1252010: $1282011: $1302012: $1342013: $1362014: $1392015: $1382016: $1402017: $1442018: $1472019: $1492020: $1532021: $1552022: $1672023: $1772024: $1832025: $1882026: $193
20002026

CPI-U, U.S. city average, all items, not seasonally adjusted. Your own costs can rise faster or slower than the average basket.

How it works

The Consumer Price Index for All Urban Consumers (CPI-U) is the government's main measure of how prices change for a typical basket of goods and services. The Bureau of Labor Statistics publishes it every month, and the series goes back to January 1913.

To compare money across time, divide the CPI for the later month by the CPI for the earlier month and multiply by the amount. If the CPI was 168.8 in January 2000 and 336.9 in September 2026, prices roughly doubled, so $100 then buys about what $200 buys now.

This calculator uses the official monthly index values, not an assumed rate. To project future costs with an inflation rate you choose, use the inflation calculator instead.

Formula

Value in later month = amount × CPI(later month) ÷ CPI(earlier month)

Sources

Questions people ask

What is the CPI?

The Consumer Price Index measures the average change over time in prices urban consumers pay for a market basket of goods and services, including food, housing, apparel, transportation, medical care and recreation. It is set so the 1982 to 1984 average equals 100.

Why is there no figure for October 2025?

The Bureau of Labor Statistics did not publish a CPI for October 2025, so there is no official index value for that month. Use September or November 2025 instead.

Which CPI does this use?

CPI-U, the U.S. city average for all items, not seasonally adjusted. It is the series most often quoted in the news and the one used for long historical comparisons. Social Security cost-of-living adjustments use a different index, CPI-W.

How often is the data updated?

BLS releases each month's CPI about two weeks after the month ends. This page is updated with new months as they are published; the badge at the top shows the latest month included.