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Electricity Bill Calculator Australia

Estimate your electricity bill by state, calculate potential solar savings, and compare energy plans side by side.

Rates are indicative state averages. Your actual bill depends on your retailer, plan type, and usage pattern. Compare plans at energymadeeasy.gov.au.
Rates pre-fill based on state averages
kWh
Check your last bill for actual daily usage
days
Typically 90 days (quarterly) or 30 days (monthly)
c/kWh
Usage rate from your energy plan
c/day
Fixed daily charge for grid connection
—

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How to Use This Calculator

Tab "Bill Estimate"

Select your state or territory to pre-fill indicative average rates, then adjust your daily usage (kWh), billing period (typically 90 days for quarterly), tariff rate (c/kWh), and daily supply charge (c/day). The calculator shows your estimated bill including GST, usage cost breakdown, supply charges, and daily cost.

Tab "Solar Savings"

Enter your daily usage, daily solar generation (kWh from your system), feed-in tariff (what your retailer pays for exports), and self-consumption % (how much solar you use directly). See your annual bill with and without solar, total savings, and feed-in credits.

Tab "Compare Plans"

Enter the usage rate and supply charge for your current plan and an alternative plan, plus your daily usage. See the annual cost difference and potential savings from switching.

The Formulas

Electricity bill calculation:
Usage cost = Daily usage (kWh) × Billing period (days) × Tariff rate (c/kWh) ÷ 100
Supply cost = Daily supply charge (c/day) × Billing period (days) ÷ 100
Subtotal = Usage cost + Supply cost
GST = Subtotal × 10%
Total bill = Subtotal + GST

Solar savings:
Self-consumed solar = Daily generation × Self-consumption %
Exported solar = Daily generation − Self-consumed solar
Net grid usage = Daily usage − Self-consumed solar (min 0)
Feed-in credit = Exported solar × Days × Feed-in tariff ÷ 100
Bill with solar = (Net usage × Days × Tariff ÷ 100) + Supply − Feed-in credit + GST

Indicative state rates (c/kWh):
NSW: 30-35c | VIC: 27-32c | QLD: 28-33c | SA: 38-45c
WA: 31c (Synergy) | TAS: 28-32c | ACT: 24-28c | NT: 27c

All rates are indicative averages and may vary significantly by retailer, plan type (flat rate vs time-of-use), and usage tier. GST of 10% applies to all electricity charges in Australia.

Example

Sarah — Family Home in Sydney (NSW), 18 kWh/day

Quarterly bill (90 days). Tariff rate 32c/kWh. Supply charge 100c/day.

Usage cost$518.40
Supply charge$90.00
GST (10%)$60.84
Total estimated bill$669.24
Daily cost$7.44/day

Sarah's quarterly bill is approximately $669. With a 6.6kW solar system generating 20 kWh/day at 35% self-consumption and 5c/kWh feed-in, she could reduce her annual bill by around $1,200.

Average Electricity Rates by State

StateAvg Usage (kWh/day)Avg Cost (c/kWh)Supply Charge (c/day)
NSW15-1830-35c90-110c
VIC12-1527-32c100-120c
QLD16-2028-33c90-110c
SA14-1738-45c95-120c
WA18-2231c (Synergy)107c
TAS14-1628-32c~90c
ACT14-1624-28c70-90c
NT25-30~27c~65c

Frequently Asked Questions

This calculator uses indicative average rates. Your actual bill depends on your specific retailer and plan, whether you're on a flat-rate or time-of-use tariff, any pay-on-time or direct-debit discounts, controlled load tariffs (for hot water, pool pumps), and seasonal usage variations. Check your bill or your retailer's website for your exact rates.
The daily supply charge is a fixed fee for being connected to the electricity grid. You pay it every day regardless of how much electricity you use. It covers the cost of maintaining poles, wires, meters, and other network infrastructure. Typical supply charges range from 65c to 120c per day depending on your state and plan.
Time-of-use (TOU) tariffs charge different rates depending on when you use electricity. Peak rates (typically 3pm-9pm weekdays) are highest, shoulder rates are moderate, and off-peak rates (overnight and weekends) are lowest. TOU plans can save money if you can shift usage to off-peak times, such as running dishwashers and washing machines overnight or during weekends.
For most Australian households, solar panels pay for themselves in 3-7 years depending on your location, system size, electricity usage, and self-consumption rate. The key factor is self-consumption — using solar power directly saves you the full tariff rate (25-45c/kWh), while exporting only earns the feed-in tariff (3-8c/kWh). Adding a battery can increase self-consumption but extends the payback period.
The Australian Energy Regulator runs energymadeeasy.gov.au, a free comparison tool covering NSW, VIC, QLD, SA, TAS, and ACT. Enter your postcode and usage to see all available plans. For WA, check Synergy (south-west) or Horizon Power (regional). For NT, check Jacana Energy. You can also use commercial comparison sites, but energymadeeasy.gov.au is government-run and shows all plans without commission bias.

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