EV Charging Time Calculator
Use this EV charging time workflow for a practical time estimate from battery size, SOC window, charger power, efficiency, and miles per kWh.
- Battery energy added
- kWh
- Grid energy used
- kWh
- Estimated charging time
- h
- Estimated miles added
- mi
- SOC window
- percentage points
Calculation details
- Calculation basis
- Selection boundary
Recent results
Formulas
- SOC window percent = target SOC - start SOC
- Battery energy added kWh = battery capacity kWh x SOC window percent / 100
- Grid energy kWh = battery energy added kWh / charging efficiency factor
- Charging time hours = grid energy kWh / charger kW
- Estimated miles added = battery energy added kWh x miles per kWh
Use this calculator
Estimate EV energy added, grid energy, charging time, and miles added from entered battery and charger assumptions.
Read the result
Review the calculated values with their displayed units and assumptions. The result is a planning aid for the stated inputs, not a final equipment or installation decision.
Check before final work
This EV charging time estimate uses entered battery and charger assumptions only. It does not size EVSE circuits, evaluate load management, model vehicle taper curves, or approve code compliance.
FAQs
Why is this only an estimate?
Actual charging time can change with charger limits, vehicle taper curves, battery temperature, state of charge, and load management.
Does this size the EV charger circuit?
No. It estimates charging time and energy only. Circuit sizing and load management require a separate electrical review.