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Shower water per day
Minutes per person, times flow rate, times the number of people.
The Formula
Gs = m x f x n
Minutes per person, times flow rate, times the number of people.
| Symbol | Meaning | Unit | Notes |
|---|---|---|---|
| Gs | Shower gallons | gal/day | Water used by showers each day. |
| m | Shower minutes | min/person/day | Minutes in the shower per person per day. |
| f | Flow rate | gal/min | The shower head's flow in gallons per minute. |
| n | People | people | The number of people in the household. |
What Each Symbol Means
Gsgal/day
Shower gallons
Water used by showers each day.
mmin/person/day
Shower minutes
Minutes in the shower per person per day.
fgal/min
Flow rate
The shower head's flow in gallons per minute.
npeople
People
The number of people in the household.
See It Worked With Real Numbers
A formula on its own does not tell you which number goes where. The how to calculate household water usage page applies this equation to a concrete case, shows every intermediate step, and names the mistakes that produce a wrong answer even when the algebra is right.
Where This Formula Appears
This equation is the working core of How To Calculate Household Water Usage, filed under Everyday Life. Every number the guide produces comes from substituting into this one line.