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Energy cost calculation
Battery energy per year = annual km ÷ 100 × EV consumption in kWh/100 km.
Grid energy per year = battery energy ÷ (1 − charging loss ÷ 100).
Electric cost = grid energy × electricity price. Petrol cost = annual km ÷ 100 × litres/100 km × petrol price. The difference is petrol cost minus electric cost.
At the default assumptions, 15,000 km, 16 kWh/100 km, 10% charging loss and A$0.30/kWh gives A$800 per year. Petrol at 7 L/100 km and A$1.90/L gives A$1,995. The resulting A$1,195 difference is an energy-cost estimate, not guaranteed savings.
Use consumption before charging losses to avoid counting losses twice. Electricity price should reflect your charging mix, including public charging if applicable. If a public tariff includes fees charged separately, include those separately in your own comparison. All costs are expressed in Australian dollars as a consistent example currency.
Scope
The calculator excludes depreciation, purchase price, finance, taxes, insurance, servicing, tyres and charger installation. It is a planning tool. The car photograph is a concept illustration and does not represent a specific production model.
Last reviewed 10 November 2026.