This series is a measure of expected inflation (on average) over the five-year period that begins five years from today.
This series is constructed as:
where DGS10, DFII10, DGS5, and DFII5 are the 10 year and 5 year nominal and inflation adjusted Treasury securities. All of those are the actual series IDs in FRED.
Release: Interest Rate Spreads
Federal Reserve Bank of St. Louis, 5-Year, 5-Year Forward Inflation Expectation Rate [T5YIFR], retrieved from FRED, Federal Reserve Bank of St. Louis https://research.stlouisfed.org/fred2/series/T5YIFR/, August 1, 2015.