Tap Water Calculator - Daily Usage, Cost & Savings

Your details

All activities scale by the number of people, except outdoor watering.
people
Your utility charges per gallon (US average is about $0.004/gal = $5/1,000 gal).
$/gal
How many gallons (or litres) each person drinks daily.
gal/person
Standard single-use bottle is 16.9 fl oz (500 mL). Change this to match what you buy.
fl oz
What you actually pay per bottle, e.g. from a convenience store or vending machine.
USD
showers
min
flushes
Total for the whole household, not per person.
loads/wk
Hand washing uses more water than a modern dishwasher. Select "hand wash" below to reflect that.
loads/wk
Brushing teeth, washing hands, rinsing dishes, etc. 5 minutes is a typical average.
min
Total for lawn, garden, car washing, etc. This does NOT scale by people count.
gal/day
Daily tap water useVery efficient
169.6

Total household water consumption per day

Monthly tap water cost20.35USD
Monthly bottled water cost511.24USD
Monthly savings (tap vs bottled)511.06USD
Shower usage60
Toilet usage24
Laundry usage18.3
Dishwasher / dishes usage4.3
Faucet usage33
Outdoor usage30
5-year savings30,664USD
10-year savings61,328USD
20-year savings122,655USD
vs. US average per person-25.5
Showers60
Toilets24
Laundry18.3
Dishes4.3
Faucets33
Outdoor30
Tap water20.35
Bottled water511.24

Monthly savings: 511.06

Your household uses 170 gal of tap water per day.

  • Your household uses 57 gal per person per day, which is below the US average of 82 gal.
  • Switching your drinking water from bottles to tap could save you $511.06 per month, or $122655 over 20 years.
  • Showers account for 35% of your household water use - the single largest category.

Next stepUpgrading to a high-efficiency showerhead (1.5 gpm) can cut shower water use by 40% with no change in shower time.

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