EV Charging Calculator: Time, Cost and Home Charger Size
Estimate EV charging time and wall energy from your battery, charge window and real power limits. Add your own electricity rate, range and home refill needs only when useful.
Charging time · energy · cost
About 4 h 33 min to charge from 20% to 80%
This example adds 45.00 kWh to a 75 kWh battery and draws about 50.00 kWh from the wall. Your car limits the 11.5 kW charger to 11 kW.
Use your car and charger ↓Battery and charging window
Use your vehicle's usable battery capacity. The target must be above the starting charge.
Power limits
Use the charger's output and the limit your vehicle accepts for this charging method. The lower value sets the ceiling.
Model a DC fast-charge taper
Only use this with a vehicle-specific charge curve. Enter an average fraction of peak power after the threshold; a single fraction cannot predict a real DC session.
Add price, range or home charging needs
Leave a value blank if you do not know it. Cost and range appear only when you provide the relevant data.
11 kW effective ceiling · no DC taper
Planning estimate: temperature, battery conditioning, shared power and the actual charge curve can change time. Charger installation and circuit sizing need a qualified professional.
See the calculation
Battery energy = usable capacity × (target − start) ÷ 100. Wall energy = battery energy ÷ (1 − loss fraction). Effective charging power is the lower of charger and vehicle limits. Without taper, time = wall energy ÷ effective power. With taper, the battery energy before and after the threshold is calculated separately; the latter uses the entered average power fraction.
Session cost = wall energy × your electricity price. Range added = battery energy × your driving efficiency. Minimum average plug power for daily travel = daily miles ÷ driving efficiency ÷ (1 − loss fraction) ÷ charging hours. It is a daily energy comparison, not electrical design or a guarantee for every day.
For the distinction between kW, kWh and vehicle limits, see US EPA charging details. The EPA home charger calculator also starts with miles to replenish and time available.
