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Gas Bill Calculator: Check What Your Gas Bill Should Cost

Enter the gas you used and the days in your billing period. The calculator works out the bill and compares your daily use with the AER benchmark.

Checked against AER data, October 2026

Most plans charge a higher rate for the first block of gas. If your bill shows two rates, use an average of them weighted by the MJ in each.

Estimated gas bill

$316.31

Per day $3.48Use 55 MJ/day
Gas usage5,000 MJ at 4.950c$247.50
Supply charge91 days at $0.7561$68.81
Total, GST included$316.31

A three-person home in NSW averages about 55 MJ a day across the year on the AER benchmark, far more in winter. Yours is 55 MJ a day for this bill.

Concessions and discounts are not included. A guide only.

How to use the gas bill calculator

  1. Choose your area

    This fills in typical rates. Not sure of your network? See gas networks.

  2. Enter MJ and days

    Copy them from your bill. See reading your gas meter if you only have meter readings.

  3. Check the rates

    Enter your plan's usage rate and supply charge to match your bill exactly.

Compare your daily use with the average gas bills by state.

Questions about calculating a gas bill

Multiply the MJ used by your usage rate in cents, then add the daily supply charge for each day in the billing period. Take off any concession or discount.

In the usage section. The bill converts the cubic metres on your meter into MJ using the heating value and a pressure correction factor.

Most plans use stepped blocks: a higher rate for the first slice of gas in each period and a lower rate after that. Many Victorian plans also charge more in winter.

Yes. The pre-filled rates include GST, as residential gas prices are quoted.

Sources

Typical rates come from the AER's Energy Made Easy data; benchmarks from the AER. Last checked October 2026. Prices include GST unless we say otherwise.