Travel & transport
EV charging time & cost
Estimate an energy top-up using average power, efficiency and your tariff.
A clear answer. Here’s how.
Battery energy added = usable capacity × charge-percentage increase. Grid energy divides by supplied efficiency; time divides grid energy by average grid power. Cost multiplies grid energy by your entered tariff. Requires target ≥ starting charge. Average power must account for taper and vehicle limits; no live tariff, charging curve, session fee or battery-health estimate is supplied.
See a worked example
Worked example
A fixed demonstration, separate from the values you enter above.
- Usable battery capacity (kWh)
- 60
- Starting charge (%)
- 20
- Target charge (%)
- 80
- Average grid charging power (kW)
- 7.2
- Grid-to-battery efficiency (%)
- 90
- Price per grid kWh
- 0.25
Example result
- Battery energy added (kWh)
- 36
- Grid energy used (kWh)
- 40
- Charging time at average power (hours)
- 5.55555555556
- Charging time (minutes)
- 333.333333333
- Energy cost at entered tariff
- 10.00