London ElectricalDistributors
Energy & cost

EV charging cost calculator

Calculate the energy charge for a session using grid-side kWh.

Your values

Example values are prefilled. Replace them with your own.

kWh

Grid-side energy from the session receipt or meter, not battery capacity.

p/kWh

Example rate only. Enter your actual rate, including any applicable tax.

Result

EV charging cost
Ready

– – –

Enter your values and press Calculate result.
Formula£ = grid kWh × p/kWh ÷ 100

Within this model

Use energy billed by the charger or measured at the supply, which includes charging losses. Battery capacity or energy stored in the battery is not equivalent. Excludes session, parking, idle and subscription fees.

What the numbers mean

The energy part of a charging bill is metered kilowatt-hours multiplied by the unit rate. Charging losses are already included in grid-side measurements. For a session spanning multiple tariffs, calculate each tariff period separately.

Formula reference: Virginia Tech · Estimating energy use ↗

A worked example

40 kWh billed at 25 p/kWh has an energy charge of £10.

Validation, precision and limitations

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