Evcharging Time Calculator
Free Evcharging time Calculator for fuel & energy. Enter your stats to get performance metrics and improvement targets.
Reviewed for accuracy by Daniel Agrici, Founder & Lead Developer
Evcharging Time Calculator
Calculator
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Formula: Charging Time = (Battery kWh x (Target% - Current%) / 100) / (Charger kW x Efficiency)
Worked example — Charging time: 5h 18min | Cost: $7.58 | Miles added: ~175
Formula
Charging Time = (Battery kWh x (Target% - Current%) / 100) / (Charger kW x Efficiency)
The energy needed is the battery capacity multiplied by the difference in state of charge percentages. This is divided by the charging efficiency to account for energy losses. The result is divided by the charger power in kilowatts to get the time in hours. DC fast chargers taper above 80% SOC, requiring separate calculations for energy delivered above and below that threshold.
Worked Examples
Example 1: Overnight Home Charging
Problem:Charge a 75 kWh EV from 20% to 90% using a Level 2 home charger at 11 kW with 90% efficiency. How long will it take?
Solution:Energy needed = 75 kWh x (90% - 20%) = 75 x 0.70 = 52.5 kWh Energy with losses = 52.5 / 0.90 = 58.33 kWh Charging time = 58.33 / 11 = 5.30 hours Cost at $0.13/kWh = 58.33 x $0.13 = $7.58 Miles added = 52.5 / 0.30 = 175 miles
Result:Charging time: 5h 18min | Cost: $7.58 | Miles added: ~175
Example 2: DC Fast Charging Road Trip Stop
Problem:Charge a 100 kWh EV from 10% to 80% at a 150 kW DC fast charger with 92% efficiency.
Solution:Energy needed = 100 x (80% - 10%) = 70 kWh Energy with losses = 70 / 0.92 = 76.09 kWh Charging time = 76.09 / 150 = 0.507 hours = ~30 min Cost at $0.35/kWh = 76.09 x $0.35 = $26.63 Miles added = 70 / 0.30 = 233 miles
Result:Charging time: ~30 minutes | Cost: $26.63 | Miles added: ~233
Frequently Asked Questions
How long does it take to charge an electric vehicle from empty to full?
Charging time varies enormously depending on the charger type and battery size. A Level 1 home outlet at 120 volts delivers about 1.4 kW and takes 40 to 60 hours to fully charge a typical 75 kWh EV battery. A Level 2 home charger at 240 volts provides 7 to 11 kW and charges the same battery in 7 to 11 hours, making it ideal for overnight charging. DC fast chargers range from 50 kW at older stations to 350 kW at the newest installations, charging from 20 to 80 percent in 20 to 60 minutes. Most EV owners charge at home overnight using Level 2 chargers and only use DC fast charging on road trips. The key insight is that you rarely charge from 0 to 100 percent, similar to how you top off your phone each night rather than running it completely dead.
Why does DC fast charging slow down above 80 percent?
DC fast charging slows dramatically above 80 percent state of charge due to the physics of lithium-ion battery chemistry. As the battery fills, the voltage difference between the charger and battery cells decreases, reducing the rate at which current can flow. Additionally, charging at high rates above 80 percent would generate excessive heat that could damage the battery cells and accelerate degradation. The battery management system deliberately tapers the charging power to protect battery longevity. A DC fast charger that delivers 150 kW at 20 percent SOC might deliver only 50 kW at 80 percent and just 15 kW at 95 percent. This is why charging from 80 to 100 percent can take nearly as long as charging from 10 to 80 percent, making it more time-efficient to stop charging at 80 percent on road trips.
What is Level 1 versus Level 2 versus DC fast charging?
Level 1 charging uses a standard 120-volt household outlet and delivers 1 to 1.8 kW, adding roughly 3 to 5 miles of range per hour. It requires no special installation and comes with every EV via the included portable charger. Level 2 charging uses a 240-volt circuit, the same type used for electric dryers or ovens, and delivers 3.3 to 19.2 kW depending on the amperage. Level 2 adds 12 to 60 miles of range per hour and is the recommended home charging solution. DC fast charging bypasses the car onboard charger entirely, pushing direct current into the battery at 50 to 350 kW. DC fast chargers can add 100 to 200 miles of range in 15 to 30 minutes but cost significantly more per kilowatt-hour and are primarily found along highways and in commercial locations for on-the-go charging.
What is charging efficiency and why does it matter?
Charging efficiency represents the percentage of electricity drawn from the grid that actually ends up stored in the battery. The remaining energy is lost as heat in the charging cable, onboard charger electronics, battery cooling system, and the battery cells themselves. Level 2 AC charging typically achieves 85 to 92 percent efficiency, meaning a 75 kWh battery requires approximately 82 to 88 kWh of grid electricity to fully charge. DC fast charging efficiency ranges from 80 to 95 percent depending on the charge rate and ambient temperature. Cold weather reduces efficiency further because the battery must be heated to an optimal temperature before fast charging can begin. These losses directly affect your electricity bill and charging time calculations, which is why Evcharging Time Calculator includes an efficiency factor to provide accurate real-world estimates.
How much does it cost to charge an electric vehicle at home versus public chargers?
Home charging costs depend on your local electricity rate, which averages around 13 cents per kWh in the United States. Charging a 75 kWh battery from 20 to 80 percent at home costs approximately $5.85 for 45 kWh of energy, accounting for charging losses. Many utilities offer time-of-use rates where overnight electricity drops to 5 to 8 cents per kWh, reducing costs further. Public Level 2 chargers typically charge 20 to 35 cents per kWh, while DC fast charging networks like Electrify America and EVgo charge 30 to 45 cents per kWh, making them roughly 2 to 3 times more expensive than home charging. Tesla Superchargers average 25 to 35 cents per kWh for Tesla owners. Despite public charging being more expensive, even DC fast charging costs approximately 60 to 70 percent less per mile than gasoline in an equivalent vehicle.
References
Reviewed for accuracy by Daniel Agrici, Founder & Lead Developer · Editorial policy
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