How many credits does each executor use?

The full and up-to-date table for the cost of each executor and size can be found on this page:

Note that re-running with SSH will charge credits for the executor and resource class used. So if you re-run a job with SSH that originally ran a Docker Medium container, you will be charged 10 credits/minute.

You can learn more about implementing different executors and Resource Classes below:

Choosing an Executor Type

CircleCI Configuration Reference: Resource Class