How much water do we use?

This chart will help you calculate how much water your household uses a month. If you have water-saving appliances or toilets, your use may be somewhat less than the amount you have calculated on the chart.
Showers Multiply the number of daily showers by the number of minutes each shower takes. Now multiply that number by 3 gallons per minute used. Enter that number in the box.  
Baths Multiply the number of daily baths by 36 (gallons in a full bath) or 18 (gallons in half full tub). Enter that number in the box.  
Toilets Multiply the number of persons in the home by the number of daily flushes. (The average is four per person.) Multiply that figure by 3, the number of gallons used per flush. Enter that number in the box.  
Brushing Teeth Multiply the number of persons in the home by the number of daily tooth brushings. Multiply that figure by 3 (the number of gallons used while the faucet runs for one minute). Enter that number in the box.  
Hand Washing Multiply the number of times per day dishes are washed by the number of minutes the water is running. Multiply that by 3. Enter that number in the box.  
Dishwasher Add the number of times a week you run the dishwasher and divide by 7 to obtain the average daily usage. Multiply that figure by 12 (the number of gallons used by each wash). Enter that number in the box.  
Laundry Add the number of loads of laundry done weekly and divide by 7. Multiply that figure by 44 (the number of gallons used per load). Enter that number in the box.  
Other Indoor Use The people in your household use water in other ways. Multiply the number of persons in the household by 10 gallons. Enter that number in the box.  
Outside Watering You also use water outside (watering plants, washing cars, filling pools, etc.). Multiply the number of minutes you have a hose turned on by 6 and enter that number in the box.  
Now calculate your household's daily use. Add up all the boxes to get an estimate of the gallons of water used daily. Enter in the box. 
Next, calculate your monthly use by multiplying the amount used daily by 30. Enter in the box. This is your estimated monthly usage. 
© 1994 Tennessee Association of Utility Districts.

If you feel your water bill is high, click here to learn what to check for.