FedWatch Odds Are Market Estimates With Assumptions

A futures price can imply a strong expectation of a Federal Reserve rate cut without promising that the cut will happen. CME FedWatch translates federal funds futures prices into estimated probabilities for policy-rate outcomes. Those probabilities depend on market prices and a calculation framework, and can change sharply after new information.

The first distinction is between the policy target range, the effective overnight rate and the monthly rate represented by a futures contract. Treating all three as the same number can produce a misleading account of what traders have priced.

The contract refers to a monthly average

The New York Fed publishes the effective federal funds rate, or EFFR, based on overnight unsecured transactions. It calculates the daily rate as a volume-weighted median. The FOMC sets a target range for the federal funds market; the observed EFFR is a particular rate within the operating framework.

Federal funds futures are quoted using 100 minus the implied average effective rate for the contract month. A hypothetical futures price of 95.70 therefore corresponds to a 4.30% monthly average. That is not a 95.70% probability, and it is not automatically the rate expected immediately after the month's policy meeting.

Calendar weighting explains why. Suppose a hypothetical 30-day month contains 20 days at an effective rate of 4.50% and ten days after a decision. If the post-decision effective rate were 4.25%, the monthly average would be about 4.4167%. Twenty unchanged days still influence the contract's settlement.

A meeting probability requires assumptions

CME's methodology uses futures-implied rates and assumptions about policy changes in 25-basis-point increments to construct a probability tree. It also needs a relationship between changes in the target range and the effective rate. The result is an estimate under that framework, not a poll of FOMC members.

A simplified hypothetical calculation illustrates the idea. Assume only two post-meeting effective rates are possible: 4.50% with no change or 4.25% after a cut. If the expected post-meeting rate is 4.35%, the implied cut probability is (4.50 minus 4.35) divided by 0.25, or 60%. The remaining 40% belongs to no change.

In the 30-day example, that expected post-meeting rate produces a monthly average of 4.45%: two-thirds at 4.50% and one-third at 4.35%. The corresponding futures price is 95.55. Simply dividing the monthly five-basis-point decline by a 25-basis-point cut would give 20%, missing the meeting-date adjustment.

These figures are deliberately hypothetical and simplify CME's full procedure. They show why reading the contract month and decision date matters before interpreting a quoted probability. More possible outcomes require more structure than one average rate supplies on its own.

The expected amount is not the most likely decision

An expected reduction of 15 basis points does not mean the Fed plans a 15-basis-point move. In the simplified example it is the probability-weighted average of a 25-basis-point cut and no change. A mean can lie between outcomes that are individually possible.

The same mean can also fit a different distribution. A 30% probability of a 50-basis-point cut and a 70% probability of no change produces the same expected 15-basis-point reduction. Futures pricing alone does not uniquely identify every possible distribution without additional assumptions or information.

This is a useful limit when headlines say a decision is fully priced. The phrase may refer to an expected cumulative amount, the probability of at least one cut or the probability of a particular target range. Those are distinct claims and should be identified separately.

Later meetings involve possible paths

A later target-rate outcome can be reached through different sequences of decisions. A lower rate by December does not require a cut at every intervening meeting. CME combines successive nodes to describe distributions over future outcomes, so a later range is not automatically a forecast for the size of one meeting's move.

As a purely illustrative exercise, two independent 60% chances of a cut would give a 36% chance of two cuts, 48% of exactly one and 16% of none. Actual meeting decisions are related through incoming data and prior policy choices. The exercise explains aggregation, not an assumption that real decisions are independent.

Report the probability with a timestamp

Specify the tool, observation time, meeting date and target range when quoting market-implied odds. Compare the estimate before and after a data release using consistent timestamps. A change can reveal repricing, but it does not establish that the Fed has communicated a private decision.

Read the result alongside inflation data, employment and the Fed's public guidance. For longer maturities, Treasury yields also include compensation for risks beyond the expected policy path. FedWatch is useful for describing one market's pricing of policy uncertainty; it is not a guaranteed schedule of future rates.