EV home-charging cost calculator
Calculate energy drawn from the wall using battery size, charge window, charging losses, monthly frequency, currency, and electricity rate.
Transparent method
The calculation
Wall kWh = battery kWh × charge added × (1 + charging loss)Battery energy is lower than wall energy because charging electronics, battery conditioning, cabling, and heat consume energy.
Read the full methodology →Sensitivity check
Run three scenarios.
01
Daily top-upUse a smaller charge window with more sessions.
02
Weekly chargeUse the typical start and target percentages.
03
Cold-weather caseTest a higher charging-loss assumption.
Use the result well
What can change the answer?
- Public-session fees and parking are excluded.
- Charging losses vary with vehicle, temperature, and charger power.
- Time-of-use pricing should be modelled with the applicable off-peak rate.