Some HVAC devices such as ductless mini split AC units come with a SEER rating instead of an EER rating. If you’re like us and like to compare specification sheets, you can calculate EER if you know SEER.

Here is a simple calculator that transforms SEER to EER. Just input SEER rating and the converter will calculate the value of EER rating:

Here are some calculations of EER from SEER:

You can read more about the equations that determine the EER and SEER relationships as well as EER to SEER calculator here.