Find the cost and time to charge an electric car, from the battery capacity, the start and target level, the charger power and the energy price.
Charging details
Enter the battery capacity, the level you start from and the one you want, the charger power and the energy price.
Estimate with ~10% charging losses. Real time slows above 80% at fast chargers.
Charging cost = 60 £ · 3 h 38 minQuick calculations for drivers. Standard formulas for consumption, cost and speed. Instant in-browser calculation, no account, no data sent. Fuel prices are indicative.
The energy needed is the capacity times the level difference; cost and time follow from price and power:
A 60 kWh battery from 20% to 80% at 11 kW and 1.5/kWh: ≈ 40 kWh, ≈ 60, in ≈ 3 h 38 min.
The cost is the energy used times the price per kWh. For example, to add 36 kWh at 1.5 per kWh you pay about 54–60, depending on losses.
Multiply the battery capacity by the percentage difference. A 60 kWh battery charged from 20% to 80% receives 60 × 0.6 = 36 kWh (plus charging losses).
Time is the energy divided by the charger power. 40 kWh on an 11 kW charger takes about 3 hours 40 minutes; on a 50 kW fast charger, under an hour.
To preserve battery health and charging speed. Above 80%, fast charging slows a lot, and below 20% the battery wears faster.
AC charging (home/work) is slower (3.7–22 kW), while DC fast charging (50–350 kW) is much faster but usually more expensive per kWh.
Some energy is lost as heat in the cable, charger and battery. The calculator uses about 90% efficiency, typical of home charging.
It depends on capacity: on a 60 kWh battery, each percent is 0.6 kWh, roughly 3–4 km of real range.