Shower vs Bath Water Usage Calculator
Calculate the amount of water used in a shower compared to the amount of water used in a bath with this Water Usage Calculator.
How do you calculate the water usage of a shower or a bath?
Note: Most standard 30"x 60" bath tubs will hold a total volume of
around 40 gallons. If you fill the tub half full to use, that is 20 gallons
of water. A typical new shower head will have a flow restrictor on it
to limit flow to 2.5 GPM.
To find the amount of water used in a shower, use the equation:
Volume = Flow Rate x Time
Gallons = Gallons per Minute x Minutes
Example: The volume of water used in a 10 minute shower that has a
flow rate of 3 GPM is:
Gallons = 3 x 10
Calculated out this gives a total estimated volume of 30 Gallons
of water used in a 10 minute shower.
