How to Calculate EV Charging Cost in Australia

How does this calculator estimate the cost and time to charge an electric vehicle (battery electric vehicle, or BEV) in Australia? This page opens up the machine: the exact formula, the variables it uses, and where every electricity rate comes from, including the date each was checked. The aim is transparency. Once you can see the method, you can check any figure on this site for yourself, and you can work out the cost for your own car at the Australia calculator.

By mht-dev, Frontend Engineer & Creator

A frontend engineer who bought a first electric car in March 2026 and built EV Charge Calculator while working out the real cost of charging it, writing every guide from an everyday new EV owner's perspective.

What the calculator works out

The core calculation is simple and the same in every market: the calculator turns a battery-percentage difference into energy (kWh), then uses that energy to work out both the cost and the time. There are no hidden numbers, just three plain formulas run over the car you pick and the electricity rate you choose. Because the maths is pure, the same inputs always give the same answer, which means the calculation can be tested on its own, separately from the page you see.

The inputs are: the car's usable battery capacity (kWh), the current and target battery percentages (%), the charger power (kW), and the electricity rate per kWh. For any electric vehicle (BEV) already in the Australia preset list, the battery size and the peak DC charger power are filled in for you, so you only set the percentages and confirm the rate. Those values feed the formula below.

The formula we use

Energy needed

energy (kWh) = battery capacity × (target % − current %) ÷ 100

Charging time

time (hours) = energy ÷ charger power (kW)

Cost

cost = energy × electricity rate per kWh

Where the rate figures come from

This calculator does not guess the price of electricity. The residential rate is built from published Australia sources: the national average and state-by-state residential prices reported by Canstar, anchored by the regulated reference prices that the Australian Energy Regulator (AER) and the Australian Energy Market Commission (AEMC) set for much of the country. Public charging rates come from the published per-kWh prices of the major networks. Every value is stored with the date it was checked, and the sources table below shows the rates currently used for Australia so each estimate can be traced back to where it came from.

Because this site is fully static and does not fetch live prices when you open it, the rates are refreshed by rebuilding and re-publishing the site whenever an official figure changes, normally at the quarterly rate review. The latest update date is shown under the sources table so you know how current the numbers are. Two real-world costs sit outside this per-kWh method on purpose: public chargers sometimes add a per-session or idle fee, and your own bill can sit above or below the state average depending on your retailer and plan, so always sanity-check against your latest electricity bill.

Electricity rate sources

Rates updated 2026-06-02

A worked example: home versus public DC charging

To show the formula and the rates at work, the table below takes a popular electric vehicle in Australia and charges it from 20% to 80%, the most realistic everyday range. It compares the cost and time at home (residential rate, AC charging) against a public DC fast charger (public DC rate, fast charging). Every figure is produced by exactly the same formula explained above, with nothing typed in by hand, so changing a rate in the configuration changes these numbers automatically on the next rebuild.

Frequently asked questions

How does the calculator work out EV charging cost in Australia?

It converts a battery-percentage difference into energy (kWh) using the car's battery capacity, then multiplies that energy by the electricity rate per kWh to get the cost, and divides it by the charger power to get the time. For example, charging a popular Australia EV from 20% to 80% at home costs about $12.38, while the same charge at a public DC fast charger is about $22.50. Pick your own car and rate at the calculator to get a figure tailored to you.

Are the electricity rates used accurate and up to date?

Yes. Each rate is taken from a published, dated source (Canstar for the residential average, anchored by AER and AEMC reference prices, plus the networks' own public charging prices) and stored with the date it was checked, which is shown in the sources table on this page. Because the site is static, rates are refreshed by rebuilding it when an official figure changes, typically at the quarterly review for Australia. Your own bill can differ by retailer and plan, so check it against your latest statement.

Why is public DC charging faster but more expensive?

Because the formula divides energy by charger power: a public DC fast charger delivers high power, so charging from 20% to 80% takes about 13 minutes, while a home AC charger takes about 3 hours 25 minutes. But the public DC rate per kWh is higher than the home residential rate, so although it is quicker, it costs more, which is why home charging is the cheaper default for everyday driving and public DC is best kept for trips.