EV Charging CalculatorNEW
Work out charging time, cost, range gained and CO2 saved
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AllFreeTool is a free online EV charging calculator that works out how long it takes to charge an electric car from its current level to your target, how much that energy costs at your electricity price, and how much carbon dioxide the charge saves compared with petrol. You can also derive the full-charge range from your consumption per hundred kilometres. Everything is calculated in your browser.
It helps you plan a stop on a longer trip, compare charging at different power levels, and see whether home charging is genuinely cheaper than filling a tank. Bring your own battery capacity and consumption figures and the tool works out the rest in seconds, with no data leaving your device.
Why use EV Charging Calculator on AllFreeTool?
Charging Time
Get the estimated minutes needed to reach your target charge from where you are now.
Cost and Efficiency
See the charging cost at your electricity price and adjust for charging efficiency.
Range Estimate
Work out your full-charge range from the battery size and your consumption per 100 km.
Carbon Saved
Compare the charge with a petrol alternative and see the emissions you avoid.
How to use EV Charging Calculator
Enter Battery Details
Fill in the battery capacity, the current level and the target level as percentages.
Set Power, Price
Choose the charging power in kW, your electricity price and the charging efficiency.
Calculate
Press calculate to see the charging time, the cost, the range and the carbon saving.
Common questions
How is the charging time calculated?＋
The tool takes the energy you need, which is the battery capacity multiplied by the difference between your target and current charge, then divides it by the charging power and by the charging efficiency to allow for losses. The result is an estimate, since real charging slows down near full and depends on temperature.
What does the charging efficiency option change?＋
It accounts for the energy lost as heat during charging, so a lower efficiency means more grid energy is drawn for the same battery gain. This affects both the time estimate and the cost, because you pay for every kilowatt-hour that reaches the charger.
Where does the range estimate come from?＋
The full-charge range is the battery capacity divided by your consumption per hundred kilometres, multiplied by one hundred. Enter the consumption from your own vehicle or dashboard for a realistic figure rather than relying on a generic number.
Is my information uploaded to a server?＋
No. The calculation is entirely local to your browser, so your battery size, charge levels, electricity price and consumption figures are never transmitted or stored. Nothing needs to be installed, and the page works with no network connection.