There is no single typical gas bill cost in Australia because prices vary by state, retailer, tariff, daily supply charge, meter type and how much gas you use. Your bill usually combines usage charged in megajoules (MJ), a fixed daily supply charge, GST and any applicable concession or discounts. Check the billing period, meter readings and usage against the same season last year, as heating and hot water can significantly increase consumption. You can compare available plans through the Australian Government’s Energy Made Easy website or ask your retailer to explain the charges.