Electric vehicle charging cost calculator

Charging cost = energy added × price per kWh ÷ efficiency as a fraction.

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Energy added to battery (kWh)

Price per kWh

More inputs and assumptions

Charging efficiency (%)

Answer

…

Charging cost = energy added × price per kWh ÷ efficiency as a fraction.

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Precision and calculation record

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Rounding changes displayed numbers, not the calculation. Text, fractions, matrices and CSV schedules keep their own formatting. Automatic keeps up to 12 significant digits, with money shown to cents where applicable.

Step-by-step calculation

Inputs are substituted below. Each line evaluates the next operation; intermediate values are displayed to 12 significant digits while the calculation uses full precision.

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Formula and assumptions

Efficiency includes charging losses. No vehicle-specific efficiency is claimed; session fees and time-based fees are excluded.

Automatic precision shows numbers to 12 significant digits. Thousands separators such as 1,000 are accepted; use a dot for decimals.

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Updated 2026-09-26

Using Electric vehicle charging cost calculator

Charging cost = energy added × price per kWh ÷ efficiency as a fraction.

Efficiency includes charging losses. No vehicle-specific efficiency is claimed; session fees and time-based fees are excluded.

Next: Electricity cost calculator

A worked example

With energy added to battery (kwh) = 50, price per kwh = 0.2, charging efficiency (%) = 90, the charging cost is 11.11111111111111.

Next: Electric vehicle fuel savings calculator

Before you use the result

Efficiency includes charging losses. No vehicle-specific efficiency is claimed; session fees and time-based fees are excluded.

Example results for energy added to battery (kwh)

These examples use Price per kWh: 0.2; Charging efficiency (%): 90. They are reference calculations, not recommended settings.

Energy added to battery (kWh)	Charging cost
25	5.55555555556
50	11.1111111111
100	22.2222222222

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