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Water Bill Calculator

Estimate your water bill based on usage, wastewater charges, standing charges and billing period.

Your Details

Overview

Use this Water Bill Calculator to estimate how much you may pay for water supply and wastewater services. Enter your water usage, per-unit rates, fixed standing charge, billing period and any tax or VAT to get a quick bill estimate.

How it works

The calculator multiplies your water usage by the water supply rate and wastewater rate to find the usage-based charges. It then adds the standing charge to get a subtotal. If you enter a tax or VAT rate, that percentage is applied to the subtotal to estimate the final bill. It also shows the average monthly cost over the billing period and an effective cost per cubic metre.

How to use this calculator

  1. 1Enter your water usage in cubic metres for the billing period.
  2. 2Add the water supply rate charged per cubic metre.
  3. 3Enter the wastewater rate if applicable, or use 0 if none applies.
  4. 4Add the standing charge for the billing period.
  5. 5Enter the number of months covered and any tax or VAT rate.
  6. 6Review the estimated total bill, subtotal and average monthly cost.

Example Calculation

Water usage

15

Water supply rate

$2

Wastewater rate

$2

Standing charge

$12

Billing period

3

Tax or VAT rate

5%

Estimated water bill

$72.45

If you use 15 m³ over 3 months, with a water rate of 2.10, a wastewater rate of 1.70, a standing charge of 12 and 5% tax, the estimated bill would be about 72.45, or around 24.15 per month.

Frequently asked questions

What does this Water Bill Calculator estimate?

It estimates your total water bill using water usage, water and wastewater rates, fixed charges and any tax or VAT you enter.

What unit should I use for water usage?

Enter water usage in cubic metres, shown as m³. One m³ equals 1000 litres.

Does this include wastewater or sewerage charges?

Yes, if you enter a wastewater rate. If your bill does not include this charge, enter 0.

Why is there a standing charge?

Many water suppliers include a fixed service or meter charge that applies regardless of usage. You can enter that amount here.

Will this match my actual water bill exactly?

Not always. Real bills may include local tariffs, discounts, surface water drainage, minimum charges or past balance adjustments.

Can I use this for monthly or quarterly bills?

Yes. Enter the charges and usage for your billing period, then set the number of months covered to see the average monthly cost.

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Assumptions and warnings

Assumptions

  • Water usage is measured accurately in cubic metres for the selected billing period.
  • Wastewater charges are based on the same volume as water usage unless your supplier uses a different method.
  • The standing charge entered applies to the full billing period.
  • Any tax or VAT is applied as a simple percentage of the subtotal.
  • Results are estimates and do not include discounts, credits, arrears or special tariffs unless reflected in the values entered.

Warnings

  • This calculator provides an estimate only and does not reflect every supplier's tariff structure.
  • Actual water bills may include regional pricing, minimum charges, discounts or adjustments not shown here.