# 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.