EV Charging Time Calculator: 3-Pin, 7kW & 22kW
Estimate how long your EV takes to charge on a 3-pin supply or a 7kW, 7.4kW, 11kW or 22kW home charger. Include your car's AC limit, charging losses and available power, then check whether the top-up fits your overnight charging window. Choose a car to load catalogue specifications. Other starting values are editable examples; use the rates from your bill.
Your inputs
3-pin vs 7kW vs 22kW: charging-time example
60kWh usable battery, 20% to 80%, 90% efficiency and an illustrative vehicle accepting up to 11kW AC on a suitable supply. All ratings must match the actual supply phases. A 22kW wallbox cannot exceed this vehicle's 11kW limit.
| Charger / supply rating | Effective input | 20–80% time |
|---|---|---|
| 2.3 kW | 2.3 kW | 17h 23m |
| 7 kW | 7 kW | 5h 43m |
| 7.4 kW | 7.4 kW | 5h 24m |
| 11 kW | 11 kW | 3h 38m |
| 22 kW | 11 kW | 3h 38m |
Frequently asked questions
How long does a 7kW charger take from 20% to 80%?
For a 60kWh usable battery at 90% charging efficiency, about 5 hours 43 minutes at a sustained 7kW input. Your battery size, car's AC limit and available property power can change that estimate.
Will a 22kW charger charge my car three times faster?
Only if the vehicle and electrical supply can accept that power. The calculator uses the lowest entered limit. A vehicle capped at 11kW will not draw 22kW from a larger wallbox.
Can I finish charging within a four-hour cheap-rate window?
Enter 4 in the available charging window field. The tool shows the charge level reached, capped at your target, and any extra active charging time needed. Scheduled pauses or load sharing can reduce the time actually spent charging.
Can I use this for DC rapid charging?
No. This is a constant-power AC estimate. A DC charging curve changes with charge level, temperature and vehicle limits; an advertised peak DC power cannot predict the full session.
Guides for your charging decision
How this works
Input power is the smallest of the vehicle AC limit, charger power, optional property limit and a 7.4 kW ceiling when single phase or unknown supply is selected. Time = energy added ÷ (input power × efficiency / 100). An optional charging window estimates the state of charge reached, capped at your target, and the additional active charging time needed. Use the vehicle AC rating for your actual supply phases, not a three-phase rating on a single-phase supply. Temperature, battery management, load sharing and tapering can extend charging time. This is an AC estimate, not a DC rapid-charge curve.
Technical references
- US Department of Energy: charging power and vehicle limits
- Energy Saving Trust: time-of-use tariffs and negative prices
- NIST: exact distance conversion factors
Keep the assumptions in view
Use the usable battery capacity and AC rating from your vehicle documentation. Use electricity prices from your current bill. Estimates do not replace an electrical survey or a supplier quote.
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