Estimate how long it takes to charge your electric vehicle
The UK is rapidly transitioning to electric vehicles, with the government's plan to ban the sale of new petrol and diesel cars driving adoption. As of 2024, there are over one million battery electric vehicles on UK roads, supported by a growing network of more than 50,000 public charge points. One of the most common questions from new and prospective EV owners is "how long will it take to charge?" The answer depends on several factors: your battery size, the charger power, and how much charge you need. A typical home charger at 7 kW will fully charge a 60 kWh battery in about 9 hours, while a 150 kW ultra-rapid charger at a motorway service station can add significant range in under 30 minutes. This calculator accounts for the real-world charging efficiency of approximately 90%, meaning some energy is lost as heat during the charging process. This gives you a more accurate estimate than simply dividing battery capacity by charger power.
To estimate your EV charging time: 1. Enter your battery capacity in kilowatt-hours (kWh). This is listed in your EV's specifications. Common sizes range from 40 kWh for smaller city cars to over 100 kWh for premium models. 2. Select the charger power. Choose from common UK charger types: a 3 kW standard plug, 7 kW home wallbox, 22 kW workplace charger, 50 kW rapid charger, 150 kW ultra-rapid, or 350 kW ultra-rapid+. Note that your car's onboard charger may limit the maximum charging speed. 3. Set your current charge level using the slider. Most EV dashboards show this as a percentage. 4. Set your target charge level. Manufacturers recommend charging to 80% for daily use to preserve battery health, though charging to 100% is fine for occasional long trips. 5. Enter your electricity rate in pence per kWh. The UK average is around 28p/kWh, but this varies by tariff. Some EV-specific tariffs offer cheaper overnight rates as low as 7p/kWh. 6. Review the results showing estimated charging time, energy needed, and the cost of charging.
The EV charging time calculation accounts for real-world charging efficiency: Energy needed (kWh) = battery capacity x (target charge - current charge) / 100 Charging time (hours) = energy needed / (charger power x 0.9) The 0.9 factor represents 90% charging efficiency. In practice, energy is lost as heat in the charger, cables, and battery management system. This is why your electricity meter will show slightly more energy used than actually stored in the battery. Estimated cost = energy needed x electricity rate (pence/kWh) / 100 For example, charging a 60 kWh battery from 20% to 80% on a 7 kW home charger: energy needed = 60 x (80 - 20) / 100 = 36 kWh. Charging time = 36 / (7 x 0.9) = 36 / 6.3 = approximately 5 hours 43 minutes. At 28p/kWh, cost = 36 x 28 / 100 = GBP 10.08. Note that rapid and ultra-rapid chargers may slow down as the battery approaches full charge, so real-world times for the last 20% can be significantly longer than this linear estimate suggests.