EV Charging Time & Range Calculator
Calculate exactly how long it will take to charge your electric vehicle from any state of charge to your target — and how many miles of range you'll gain — across Level 1, Level 2, and DC Fast Charging speeds.
About this calculator
This calculator estimates the time needed to charge an EV from a given state of charge to a target level, and how much driving range that charge session adds. The core formula is simple: charge time = energy needed ÷ (charger power × efficiency). The energy needed is the battery capacity multiplied by the percentage points being added. The efficiency factor — typically 88–93% depending on charger type — accounts for heat losses in the onboard charger and cables; it also explains why the wall energy drawn is slightly higher than the battery energy gained. The range estimate multiplies the battery energy added by the vehicle's real-world efficiency in miles per kWh. The comparison table shows how the same charge session would take across all three charger levels, making it easy to weigh road-trip planning options.
Field explanations
- Battery capacity (kWh)
- The usable battery capacity of your EV in kilowatt-hours. Use the quick-fill presets for a popular model, or enter a custom value. Note that manufacturers sometimes quote gross capacity (total cells) vs. usable capacity (what the car actually uses); use the usable figure for accuracy. This is typically 90–95% of the gross number.
- EV efficiency (miles per kWh)
- How efficiently the vehicle converts electrical energy into distance. Higher is better. Most passenger EVs range from 2.5 to 4.5 mi/kWh. Cold weather, highway speeds, and running accessories (heat, AC) reduce this number. The EPA's fueleconomy.gov lists rated efficiencies for every model.
- Current battery level
- The vehicle's state of charge when you plug in, as a percentage of usable capacity. Read this from your vehicle's dashboard or app before plugging in.
- Target battery level
- The desired state of charge when you unplug. For daily driving, a target of 80% is recommended by most manufacturers to preserve long-term battery health. Save 100% charges for road trips or when you need maximum range.
- Level 1 — Standard outlet (120V)
- A standard North American household outlet. Delivers ~1.4 kW, adding roughly 4–5 miles of range per hour. Only practical for overnight charging or plug-in hybrids with small batteries. Requires no special equipment.
- Level 2 — Home or destination charger (240V)
- A 240V dedicated circuit with an EVSE (Electric Vehicle Supply Equipment). Home units typically deliver 7.2 kW (32A circuit), while commercial destination chargers can reach 11–19.2 kW. Adds 20–30 miles of range per hour. The most common setup for daily home charging.
- Level 3 — DC Fast Charge (DCFC)
- Direct DC charging that bypasses the vehicle's onboard AC charger, delivering power directly to the battery at 50–350 kW. Found at public charging stations (Tesla Supercharger, Electrify America, EVgo, ChargePoint). Adds 100–800+ miles per hour at peak output. Important: charging speed automatically tapers above 80% state of charge to protect battery chemistry — time estimates for targets above 80% will be longer than calculated.
- Charger power output (kW)
- The actual power output of the charging station in kilowatts. This is the lower of: (a) the station's rated output and (b) your vehicle's maximum acceptance rate. For example, a 250 kW DC fast charger will only deliver 150 kW to a vehicle rated for 150 kW max charge rate.
- Charging efficiency
- The percentage of electricity drawn from the wall that actually ends up stored in the battery. The rest is lost as heat in the cables, onboard charger, and battery management system. Typical values: Level 1 and Level 2 AC charging: 85–92%. Level 3 DC fast charging: 92–95% (more efficient because it bypasses the onboard AC-to-DC conversion). This affects your electricity bill calculation — you pay for the wall energy, not just the battery energy.