About the Water Usage Calculator
Household water consumption per day, month and year, with the cost and a fixture breakdown.
Also known as: water consumption calculator, household water use, water bill calculator, daily water usage.
How to use this calculator
- Enter people in the household, showers per person per day, shower length, shower flow rate and the other fields.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Review the breakdown shown under the main result.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
daily litres = Σ (fixture uses × litres per use)
Worked example
Using the values pre-filled in the calculator above:
- People in the household = 4
- Showers per person per day = 1
- Shower length = 8 min
- Shower flow rate = 9 L/min
- Toilet flushes per person per day = 5
- Litres per flush = 6
- Washing machine loads per week = 5
- Dishwasher cycles per week = 5
the calculator returns:
- Daily water use: 552.3 litres
- Per person per day: 138.1 litres
- Monthly: 16.81 m³
- Yearly: 201.58 m³