Inflation calculator
See what an amount from one year is worth in another, and how much buying power cash loses while it sits still.
Market data through Aug 2026, updated monthly. How we calculate$100 in Jan 2000 is worth, in Aug 2026
Prices rose 98.4% in total, about 2.61% a year. Cash kept under the mattress since Jan 2000 now buys only 50% of what it used to.
US Consumer Price Index (CPI-U, all items, not seasonally adjusted), Bureau of Labor Statistics. Data through Aug 2026. Oct 2025 was not published and is estimated from the months around it.
How this calculator works
The calculator compares the Consumer Price Index (CPI-U) in the two months you pick. If prices doubled, $100 then buys what $200 buys now.
It also shows how much buying power cash loses when it is not invested.
Value then in today's dollars = amount × CPI(today) ÷ CPI(then)Common questions
Where does the data come from?
The US Bureau of Labor Statistics CPI-U index, all items, not seasonally adjusted, updated monthly.
Why is October 2025 estimated?
The Bureau of Labor Statistics did not publish CPI for that month, so it is estimated from the months around it.
How do I beat inflation?
Over long periods, stocks have grown faster than prices, while cash has usually lost ground.
FatDCA calculators are educational estimates, not investment, tax or legal advice. Results depend on the assumptions you enter, and past returns do not predict future returns.
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