How Markets Price Fed Odds: Fed Funds Futures, Explained

Foundations

When headlines say markets “price a 40 per cent chance” of a rate rise, that number is not a survey or a forecast. It is read directly from prices in the fed funds futures market, where traders bet real money on where the Federal Reserve’s policy rate will average in a given month. Because the contracts pay out on the actual rate, their prices can be translated into implied probabilities for each meeting outcome, updated tick by tick.

How the arithmetic works

A fed funds futures contract settles at 100 minus the average funds rate for its month. If the rate is 3.6 per cent today and the contract for the month after the next meeting implies 3.7 per cent, the market is pricing part of a 25 basis point move: roughly a 40 per cent chance of a hike, in the simplest single-move case. Tools like CME’s FedWatch do this conversion automatically, which is where the quoted odds usually come from.

Why the odds move markets

The odds are the market’s live policy forecast, so everything priced off the rate path, from two-year yields to equity valuations to the dollar, moves when they do. This is why an inflation print can matter more for what it does to the odds than for the number itself, and why a repricing can be violent when data lands on a crowded consensus: the odds are positioning made visible.

Reading them well

Two cautions. Implied probabilities assume the choice is binary and the increment is 25 basis points; when a larger move or an unscheduled decision is possible, the clean percentages blur. And the odds describe today’s expectation, not a commitment: they have been badly wrong at turning points, which is precisely when they are quoted most. Treat them as the consensus to argue with, not the answer.