Household water-use calculator
Breaking the total into shower flow and other use makes the easiest savings visible.
L/min
L
Estimated daily water
456L
- Daily shower water
- 216 L
- Average monthly water
- 13.88 m³
- Annual water
- 166.6 m³
Show the working
- People in household = 3
- Shower minutes per person per day = 8
- Shower flow = 9
- Other water per person per day = 80
- Daily shower water = 3*8*9 = 216
- other_total = 3*80 = 240
- Estimated daily water = 216+240 = 456
- Average monthly water = 456*365.2425/12/1000 = 13.8792
- Annual water = 456*365.2425/1000 = 166.551
Values are shown to six significant figures here; the arithmetic itself runs on exact fractions and is only rounded where a number is printed.
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The formula
- daily water = people x (shower minutes x flow + other daily use)
Metered use is the best calibration; appliances, leaks, gardens and guests can materially change the estimate.