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EV Charging Cost Calculator

Find the cost to charge your EV.

Result

How it is calculated

The energy added is the share of the battery you refill: Energy (kWh) = Capacity × (To − From) / 100, where capacity is the usable battery size in kWh and From and To are the state of charge in percent. The cost is Cost = Energy × Price, with price per kWh. The tool needs To to be higher than From, To no more than 100, and capacity above zero; otherwise it returns nothing. It does not model charging losses, which usually mean slightly more energy is drawn from the wall than reaches the battery, nor the slower charging speed near 100%.

Worked example

A 60 kWh battery is charged from 20% to 80% at 0.15 per kWh. The charge covers 80 − 20 = 60 percentage points. Energy = 60 × 60 / 100 = 36 kWh. Cost = 36 × 0.15 = 5.40. Charging adds 36.00 kWh and costs $5.40.

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Common mistakes

  • Entering the headline battery size when the usable capacity is smaller; the result is then overstated.
  • Putting the range in kilometres or the price per kWh in the wrong field.
  • Entering the charge level as a fraction (0.8) instead of percent (80).
  • Ignoring charging losses, so the bill on the meter ends up a little higher than the estimate.
  • Using a home tariff for a public fast charger, which is often priced much higher per kWh.

About this calculator

This calculator multiplies the battery capacity (kWh) by the percentage gap between your start and target charge levels, then applies your electricity price to estimate how many kWh go into the battery and what that energy will cost to charge an electric car between two charge levels.

EV owners use it to compare the cost of charging at home overnight versus a public fast charger, to budget for a road trip, or to check whether their utility's off-peak rate meaningfully lowers the cost of daily charging. Because charging isn't 100% efficient, the energy drawn from the wall is usually slightly higher than the figure shown: the calculator does not model charging losses (heat, AC/DC conversion), so the real cost will usually be a little higher.

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Comments (1)

  • Editorial team

    The energy shown is what the battery gains. Charging always loses some energy as heat, so the meter at the wall usually reads somewhat more than this figure, and a home bill will be slightly higher than the result. The price field is one flat rate per kWh, so a night tariff or a public charger with a session or per-minute fee needs separate runs. What tariff do you charge on: home, workplace or public?

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