EV Charging Time Calculator

EV charging time

Battery size

kWh

Start charge

End charge

Available time (optional)

hours

Charging power (optional)

Charger type

⚡ AC wall charger

Your charging time 10 hr 70.0 kWh added

Rate comparison

Typical charging time by charger type

The table below shows estimated charging times across all charger types, including the range added per charge session.

How this calculator works

This calculator estimates EV charging time based on how much energy needs to be added to the battery and the rate at which the charger delivers that energy. The charger cards show estimated time at every common charger type so you can compare at a glance.

If you enter an available time, the cards add context showing how much energy and range each charger type would add in that time window, what charge level you would reach, and whether the charger finishes early or needs more time. This is useful for comparing charger upgrades or planning around off-peak electricity windows.

Formulas

Energy needed (kWh) = Battery size × (End charge − Start charge) ÷ 100

Charging time (hours) = Energy needed ÷ Charging power

Energy in available time (kWh) = Charging power × Available time (capped at energy needed)

Worked example — charging time

Battery size: 100 kWh
Start charge: 10%
End charge: 80%
Charging power: 7 kW (AC wall charger)

Energy needed: 100 × (80 − 10) ÷ 100 = 70.0 kWh

Charging time: 70.0 ÷ 7 = 10 hr

Worked example — available time

Available time: 6 hours
Charging power: 2.3 kW (Portable charger)
Battery size: 100 kWh, starting at 10%
EV efficiency: 16 kWh per 100 km

Energy added: 2.3 × 6 = 13.8 kWh

Charge reached: 10% + (13.8 ÷ 100 × 100) = ~24%

Range added: 13.8 ÷ 16 × 100 = ~86 km

Time still needed to reach 80%: (70.0 − 13.8) ÷ 2.3 = ~24 hr 26 min more

Real-world note

This calculator assumes a constant charging rate across the full charge window. In practice, most EVs throttle charging speed above 80% state of charge to protect the battery. Actual charging times to 100% will be longer than this calculator suggests for that reason. For everyday charging to 80%, the estimate is typically accurate.

Frequently asked questions

How long does it take to charge an EV at home?

Charging time at home depends on your charger and battery size. A standard 7 kW AC wall charger takes exactly 10 hours to charge a 100 kWh battery from 10% to 80%. A slower 2.3 kW portable charger takes over 30 hours for the same charge. Most EV owners with a wall charger charge overnight and start each day with a full battery.

Why is charging above 80% slower?

Most EVs intentionally slow the charging rate above 80% state of charge to reduce heat and protect battery longevity. This is called the charging curve. The slowdown means the final 20% of charge can take as long as the first 80%. This calculator assumes a constant rate across the charge window, so estimates to 100% will be shorter than real-world times.

How long does DC fast charging take?

At 50 kW, a 100 kWh battery charged from 10% to 80% takes around 1 hour 24 minutes. At 150 kW that drops to around 28 minutes, and at 250 kW to around 17 minutes. Real-world DC fast charging times can be longer if the battery is warm, the car limits peak power intake, or the charger is shared between vehicles.

Does battery size affect charging time?

Yes. A larger battery requires more energy to charge across the same percentage window. A 100 kWh battery charged from 10% to 80% requires 70 kWh — 40 percent more than a 70 kWh battery requiring 49 kWh — so it takes proportionally longer at the same charging power. Use the battery size input above to adjust for your own vehicle.