EV charging cost and time calculator

Charging settings

Usable battery capacity

kWh

Charge from–to20 % → 80 %

Now20 %

Charge to80 %

Charging power

Actual charging power

Use the lower figure: the charger output or the power your car can accept.

Electricity price

£/kWh

Vehicle efficiency

mi/kWh

Prices are examples. Enter your own home tariff or the rate displayed by the charging network.

View official UK public charging information →

Charging losses10 %

Losses between the grid and battery

10 %

A 10% loss is used initially. The real figure changes with the car, temperature and charging method.

Charging result

Estimated charging time——

Charging cost——

From the grid——

Added range——

Range at 80 %——

Electricity cost per mile—

Added per hour—

—

How long would the same charge take at different powers?

The same battery and percentage interval, assuming the stated power remains available.

Charging method	Power	Time	Range added per hour

! DC charging power is not constant and normally tapers as the battery fills. The car may also accept less power than the charger can provide, so the real time can be longer.

How does the charging location change the cost?

The comparison uses the grid energy calculated above. Enter your actual tariff for an accurate result.

Calculation method: battery capacity × percentage difference gives energy stored in the battery. Losses determine grid energy and cost. Time equals battery energy divided by actual charging power.

How to use the EV charging calculator

Five simple choices give you the key charging figures

Enter the battery

Use the usable battery capacity in kWh from the vehicle specification.

Choose percentages

Set the current battery level and the target state of charge.

Select actual power

Use the lower limit of the charger and the power the car can accept.

Enter your tariff

Use your home EV tariff or the price shown by the public charging network.

EV charging time, cost, kWh and added miles in the UK

What do 2.3 kW, 7 kW, 11 kW and 150 kW mean?

🔌

2.3–3.7 kW

Slow charging from a suitable socket or low-power charger, usually measured in many hours.

🏠

7–11 kW

Typical home charging powers. The property supply and the car’s onboard AC charger both matter.

⚡

22 kW AC

The post may offer 22 kW, but many cars accept only 7 or 11 kW on AC.

🚀

50–150+ kW DC

Rapid charging for journeys. Peak power is normally available for only part of the session.

Frequently asked questions about electric car charging

Practical answers about charging time, price, kWh and battery percentage

How long does an electric car take to charge at 11 kW?

A 60 kWh battery charged from 20% to 80% needs 36 kWh. At a constant 11 kW the ideal time is about 3 hours 16 minutes. Real charging may take longer.

How much does it cost to charge an electric car at home in the UK?

Multiply grid energy by your electricity unit rate. If the session draws 40 kWh at £0.26/kWh, it costs £10.40, excluding the standing charge.

How many kWh are needed to charge an EV from 20% to 80%?

It depends on usable battery capacity. A 60 kWh battery adds 36 kWh between 20% and 80%, plus losses from the grid.

What is a good electric car efficiency in miles per kWh?

Many electric cars return roughly 3–4 mi/kWh, but temperature, motorway speed, heating and vehicle size can change this substantially.

Why does an EV charge below the advertised 150 kW?

150 kW is a maximum charger output. The car, battery temperature, state of charge and charging curve limit the real power.

Should an electric car be charged to 100% every day?

Usually not. Many manufacturers recommend a lower daily limit, often around 80%, with 100% reserved for longer trips. Follow the guidance for your battery type.

What determines the real EV charging time?

Battery energy required, charger output, the car’s AC or DC limit, battery temperature and charging curve all matter.

Does this EV calculator store my data?

No. The calculation runs in your browser and your battery, tariff and efficiency values are not sent to our server.