All eyes are on the Fed today as officials ready their decision on what could be the final rate hike of the cycle. 

As of last night, traders assigned a 82% probability to a 25 basis-point increase, while they see an 18% chance of no change at all. 

We'll hear from central bank chief Jerome Powell today at 2 p.m. ET, shortly after the policy announcement. 

Below, we're covering everything to know for the big day.