Water Usage Calculator
Estimate your household's daily and annual water usage in kilolitres from showers, taps, laundry and other common activities.
Your results
Calculation breakdown
- Shower water
- Litres/day = people × shower minutes × flow rate
- Laundry water
- Litres/week = loads × 60 L per load (estimate)
Worked example
A household of 3 with 7-minute showers at 9 L/min and 5 laundry loads a week uses roughly 231 L a day, or about 84 kL a year.
Assumptions
- Laundry usage assumes about 60 litres per load, which varies by machine efficiency.
- Excludes outdoor watering, dishwashing and other fixture use unless added manually.
- Your water meter reading is always more accurate than this estimate.
How this calculator works
Enter the number of people in your household, average shower length and number of loads of laundry per week to estimate total water usage in kilolitres per day and per year. Use this alongside the Water Bill calculator to estimate costs.
Frequently asked questions
How much water does a shower use?
A standard showerhead uses roughly 9 litres per minute; this calculator lets you adjust the flow rate to match your fittings.
Does this include outdoor watering?
You can add an outdoor usage allowance field to include garden watering or pool top-ups in your estimate.
How accurate is this compared to my water meter?
It is an estimate based on typical fixture flow rates; your actual meter reading is always the most accurate source.
Actual prices, usage, efficiency and savings vary by provider, equipment, location and behaviour.