Water Bill Calculator
Estimate your water bill from usage in kilolitres, your utility's usage charge and fixed service charges.
Your results
Calculation breakdown
- Usage charge
- Usage charge = kL used × rate per kL
- Total
- Total = usage charge + fixed charges
Worked example
Using 60 kL at $2.90 per kL, plus $250 in fixed and sewerage charges for the same period, gives an estimated bill of about $424.
Assumptions
- Water pricing structures and fixed charges vary widely between utilities and states.
- Enter charges for whichever period your bill covers.
- Excludes any usage-based sewerage charges unless added to the fixed charge input.
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How this calculator works
Enter your water usage in kilolitres, the usage charge per kilolitre and any fixed service or sewerage charges to estimate your total water bill. Water pricing structures vary between states and utilities, so all rates are editable.
How an Australian water bill estimate is built
A typical estimate combines metered usage in kilolitres with fixed service charges. Depending on your provider and property, the bill can also include wastewater, sewerage, drainage or other service items.
Enter the rates printed on your current bill rather than a national average. Water pricing, billing periods, usage tiers and fixed charges differ between providers and locations.
- 1 kilolitre equals 1,000 litres
- Usage charge = kilolitres used × applicable rate
- Add all fixed charges for the same billing period
Check tiers, estimates and billing dates
This version accepts one usage rate. If the provider uses tiered pricing, first calculate a weighted rate as total tiered usage charges divided by total kilolitres, or calculate each tier separately and add the results. Check whether the meter reading is actual or estimated.
The calculator is useful for checking arithmetic and testing usage scenarios. It cannot determine provider-specific concessions, leak allowances, tenancy responsibilities or account adjustments.
Frequently asked questions
Where do I find my usage rate?
It is printed on your water bill or available from your local water utility's published tariff schedule.
Are sewerage charges included?
They can be included in the one combined fixed service/sewerage field. Add all fixed charges for the same billing period before entering that total.
Is this bill quarterly or annual?
The result covers the same period as the usage and charges entered. This version does not annualise the bill.
Content responsibility
Maintained by CalcAussie and last updated 30 September 2026. Checks applied: calculation method, worked examples, Australian terminology, material assumptions, official references where an external rule applies, and user-facing limitations.
Calculator results remain estimates based on the figures entered. Check material decisions against current official information and report a suspected error so it can be reproduced and corrected.
Actual prices, usage, efficiency and savings vary by provider, equipment, location and behaviour.