Water
Household Water Use Calculator
Estimate daily, monthly and annual household water use from showers, toilets, laundry, taps and outdoor activities.
Household
people
Showers
min/day
L/min
7.6 L/min corresponds to the EPA WaterSense maximum flow rate for an efficient showerhead. Replace it with your actual fixture flow rate if known.
Toilets
/day
L/flush
4.8 L/flush is the current WaterSense efficiency level for tank-type toilets. Older or local fixtures may use substantially more water.
Taps / Faucets
min/day
L/min
Includes activities such as handwashing, brushing and sink use. Enter the measured or rated flow of your faucet where possible.
Laundry
/week
L/load
53 L/load is approximately 14 US gallons, the average cited by ENERGY STAR for a full-size certified washer. Use your machine’s specification for greater accuracy.
Dishwasher
/week
L/cycle
12.1 L/cycle is approximately 3.2 US gallons, the current ENERGY STAR maximum for a standard-size certified dishwasher.
Outdoor Water Use
min/week
L/min
/month
L/wash
Outdoor use varies widely. Measure hose flow where possible by timing how long it takes to fill a container of known volume.
Other Water Use
L/day
Use this for activities not separately included above, such as manual dishwashing, cleaning or other regular uses.
Estimated Household Water Use
0 L/day
Estimated direct household water use based on the activities and fixture rates entered.
Per Person
0 L/person/day
Monthly Water Use
0 m³/month
Annual Water Use
0 m³/year
Largest Use
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Daily Use Breakdown
Showers
0 L
Toilets
0 L
Taps
0 L
Laundry
0 L
Dishwasher
0 L
Outdoor
0 L
Other
0 L
Methodology:
Flow-based uses are calculated as duration × fixture flow rate.
Event-based uses are calculated as events × water per event.
Weekly activities are converted using 7 days/week, and monthly activities use an average year of 365 days.
This calculator estimates direct household water use. It is not a full water-footprint calculator and does not include indirect water embedded in food, clothing, products or services.
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