What is the standard height for a refrigerator outlet? Thanks for your help!
There is no "standard height". The National Electrical Code never lists a height requirement.
Tradition has the height for most floor line receptacles about 12" to the bottom of the box.
The Americans with Disabilities Act recommends receptacles no lower than 19" to center of receptacle.
Normally, contractors and installers choose a height and stick with it for receptacles, switches, bathroom receptacles, and thermostats. It is more convention or tradition than anything else.
This is truly an area where you get to decide as long as it is 48" or below, it can serve the floor line.