CALCULATOR
Bath Minus Shower Water Use Calculator
Bath Minus Shower Water Use Calculator — change the supplied values to calculate bath minus shower water use.
Constant supplied flow, no water-heating or savings guarantee. Positive means bath uses more water, negative means shower uses more.
Accepted inputs: Bath water supplied: 0 to 1,000 L; Shower flow supplied: 0 to 100 L/min; Shower duration: 0 to 120 min.
How the calculation works
difference=bath liters−flow×minutes
Integrate a constant shower flow over the supplied duration; subtract from the bath volume.
Worked example
With bath water supplied 150 L, shower flow supplied 10 L/min, shower duration 8 min, bath minus shower water use is 70 L.
Assumptions and limits
Constant supplied flow, no water-heating or savings guarantee. Positive means bath uses more water, negative means shower uses more.