How many gallons of water does the average shower use per minute?

I depends on what type of shower head you have. Most newer water saving shower head have a flow of 2 gallons per minute.

Approximately 2 gallons of water per minute, according to usgs.gov.

That may depnd on your shower fitting, water pressure, water tempreature and so on. A new New Zealand designed shower head called the Methven Satin Jet is proving effective at 7.6 litre per minute....

I'm guessing that nearly all sprinklers vary, along with the amount of pressure and volume of your water hose, so we use what we call a bucket test. You start your sprinkler, put it in a 5 gallon...

well there are many diffrent sinks so its really hard too answer that . Sorry