Stocks Rally as August CPI Matches Forecasts, But Fed Hike Odds Near 90%

Fed Funds Futures: How Markets Price the Odds of a Rate Decision

When financial media report that traders see a "90% chance" of a Fed rate hike, that number doesn't come from a poll — it's extracted from the price of fed funds futures contracts, derivatives that let traders bet on where the Fed's benchmark interest rate will actually land on a specific future date. The CME Group's FedWatch Tool is the most widely cited version of this: it takes the prices of 30-Day Fed Funds futures and reverse-engineers an implied probability for each possible outcome at the next FOMC meeting — hold, or a 25-basis-point hike or cut. The math behind it is straightforward in concept. A fed funds futures contract settles based on the average effective fed funds rate over its contract month. If the market expects the Fed to definitely hold rates steady, the futures price trades at a level implying no change. If the market is split, the price settles somewhere between the "hold" level and the "hike" level, and that in-between price maps to an implied probability. As new data arrives — a CPI report, a jobs number, a Fed speech — traders buy and sell these contracts, and the implied odds shift in real time. These probabilities matter because they're the market's live consensus, not any single analyst's guess, and they move markets on their own: a shift from 66% to 90% odds of a hike can itself push bond yields higher and pressure rate-sensitive stocks, even before the Fed does anything. But the odds aren't a guarantee — they're a snapshot of current positioning that can and does move again before the actual decision.