Gas Cost Calculator
Forecast your next natural gas bill by entering daily MJ usage, supply charges, and any dual-fuel discounts. Use this calculator to compare retailers before locking in a bundle.
Usage assumptions
Charges
Estimated gas bill
$207.81
for a 92-day period
Monthly average
$67.76
Annualised cost
$824.44
Cost per MJ
$0.04 / MJ
Usage summary
- Base usage (92 days)3,220 MJ
- Season adjusted usage3,703 MJ
- Usage charges$129.61
Increase the seasonal adjustment for winter-heavy households or reduce it for mild climates.
Charge breakdown
- Supply charge$78.20
- Usage charge before discount$129.61
- Total estimated bill$207.81
Tips
Getting a better result
- Match the billing days to the exact period on your existing bill so you're comparing like for like.
- Enter a seasonal adjustment if your household uses more gas for heating during winter.
- Add the once-off connection fee if you're evaluating a new build or moving to a different distributor.
FAQ
Gas calculator questions
What's the best way to estimate daily MJ usage?+
Most retailers list daily average usage on the front page of your gas bill. If you can only see quarterly totals, divide the MJ by the number of days in the billing period to get a daily figure.
Do I have to include a seasonal adjustment?+
No. Set the adjustment to 0% for a straight-line estimate. Increasing it helps model winter-heavy households or adding new gas appliances.
How do dual-fuel discounts work in the calculator?+
Enter the percentage discount retailers advertise when bundling electricity and gas. The calculator applies it to the usage component only, which mirrors how most retailers calculate the incentive.