30-Day Fed Funds Futures Explained

The CME rulebook scopes 30-Day Federal Funds futures to a particular delivery month. The contract's trading unit is average daily interest during that named month, expressed as an annual rate. A label such as “Fed Funds futures” is therefore incomplete without its month and year.

That reference window matters before any price is interpreted. The monthly contract does not settle from one policy announcement or one overnight rate. Futures contract month codes explains why a dated futures contract is not a permanent market label.

The rulebook identifies the daily effective federal funds rate published by the Federal Reserve Bank of New York as the contract's rate input. The New York Fed describes EFFR as a volume-weighted median of overnight federal funds transactions reported through its reference-rate process.

EFFR and the FOMC's target rate or target range are related but distinct records. A daily published reference rate, a policy target, and a named futures-month price should remain separate in any explanation. SOFR futures versus Fed Funds futures separates an EFFR-based contract from SOFR-based futures before their similar rate language becomes a false match.

CME quotes the contract-grade index as 100 minus the average rate during the delivery month. Reversing the convention gives a rate expression for the named month:

For a named contract, subtract its stated price from 100 to express the implied monthly average rate under this convention.

This expresses the product's quotation convention. Before final settlement, a market price can reflect changing expectations and trading conditions; it is not the realized monthly average yet. Fed Funds futures price and implied rate keeps the quoted price, the rate expression, and a future settlement record separate.

For an expiring contract that remains outstanding, CME's rulebook calls for cash settlement through normal variation-margin procedures. The final settlement price uses 100 minus the arithmetic average of the daily rate over the delivery month, following the rulebook's handling for days when the New York Fed does not publish a rate.

The final result is therefore a completed reference-period record, not a current policy forecast. Fed Funds futures final settlement sets out the timing and recordkeeping boundary without treating a historical settlement as a price forecast for another month.

FedWatch uses 30-Day Fed Funds futures price data in a model for scheduled FOMC-meeting outcomes. The underlying contract still represents a monthly average-rate convention, while the tool's displayed probabilities require meeting dates and stated calculation assumptions.

What the CME FedWatch Tool shows is the right next guide for a meeting-probability display. How CME FedWatch probabilities work explains why a monthly price must be combined with a meeting calendar and model assumptions before it becomes an outcome estimate.

This guide describes contract mechanics. It does not publish a current futures price, predict the next EFFR, predict an FOMC decision, or recommend a rate position. Current exchange rules, market data, and account requirements govern an actual decision.