Energy Calculators
Check electricity, gas and water bill amounts, compare time-of-use and flat electricity plans, and estimate appliance running costs from your own usage and tariffs.
These calculators cover only the components entered. Controlled loads, discounts, rebates, feed-in credits, sewerage details, prior balances and other fees must be checked separately against the retailer or utility bill. Gas bills charge by the megajoule, so convert cubic-metre readings with the heating value and pressure factor printed on the bill. Device nameplate wattage can also differ from measured average use.
How to use these calculators well
- Use usage, tariff and fixed-charge figures from the same billing period.
- Check tiered or time-of-use pricing separately from a flat-rate estimate.
- Reconcile fees, discounts, credits and prior balances with the original bill.
Electricity Bill Check Calculator
Recalculate a flat-rate electricity usage and daily-supply subtotal, then compare it with the bill total entered.
Open calculatorGas Bill Calculator
Estimate your gas bill from MJ or cubic metres, your usage rate and daily supply charge, with heating value and pressure factor conversion.
Open calculatorPeak vs Off-Peak Usage Calculator
Compare a time-of-use electricity plan with peak, shoulder and off-peak rates against a flat rate, including each plan's daily supply charge.
Open calculatorWater Bill Calculator
Estimate your water bill from usage in kilolitres, your utility's usage charge and fixed service charges.
Open calculatorComputer Electricity Cost Calculator
Estimate the running electricity cost of a computer, console or other device from its wattage, hours used and your tariff.
Open calculatorRelated Australian guides
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