Electricity Bill Check Calculator
Check whether your electricity bill adds up correctly by re-calculating it from your usage, tariff and supply charge.
Your results
Calculation breakdown
- Expected bill
- Expected = (usage × usage rate) + (daily supply charge × days)
Worked example
900 kWh at 30c/kWh plus a $1.10 daily charge over 90 days gives an expected bill of $369, so a $380 charge is $11 higher than expected, worth checking with your retailer.
Assumptions
- Small differences can be explained by GST or rounding; only large gaps suggest a billing issue.
- Excludes controlled load, feed-in credits or one-off fees unless added manually.
- Compare using GST-inclusive figures throughout for accuracy.
How this calculator works
Enter the usage in kWh and days on your bill along with your usage rate and daily supply charge to recalculate the expected total, then compare it to the amount your retailer actually charged. This can help spot billing errors or a rate change you were not aware of.
Frequently asked questions
What if my recalculated total doesn't match my bill?
Small differences can arise from GST rounding or discounts; a large gap is worth raising with your retailer or checking for a rate change.
Where do I find my usage rate and supply charge?
Both are listed on your bill, usually in a section titled 'your electricity charges' or similar, in cents per kWh and cents per day.
Does this include GST?
Toggle the GST setting depending on whether your entered rates are GST-inclusive or exclusive to match your bill exactly.
Actual prices, usage, efficiency and savings vary by provider, equipment, location and behaviour.