Calendar day

Calendar day capacity is a measure of refinery capacity, adjusting for typical operating conditions that keep average throughput below the maximum achievable throughput for a single day (stream day capacity).

Calendar day capacity is the typical capacity measure used in evaluating the economics of a process unit.

The relationship between calendar days and stream days is unique to every unit, but a typical rule of thumb is 350 calendar days of operation out of 365 total (stream) days. 

The Refinery Reference Desk includes content derived from our industry experts as well as from public data sources such as company websites. Nothing herein is intended to serve as investment advice. This material is based on information that we believe to be reliable and adequately comprehensive, but we do not represent that such information is in all respects accurate or complete. McKinsey Energy Insights does not accept any liability for any losses resulting from use of the content.



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