Calculators

Four tools, one engine, zero invented rates — every tariff, feed-in rate and factor comes from the same 2026–27 datasets as the rest of the site, with the source named under each result.

• Bill estimatorYour annual and quarterly bill from your zone's official rates — with the supply/usage split.
• Appliance running costWatts × hours × your state's tariff, for 26 appliances or any custom wattage.
• Solar paybackPayback years from your quote, state tariff, feed-in rate and the STC discount — double-count-proof.
• EV vs petrolCost per 100 km and per year, home charging or public DC, against current petrol prices.