Charging Time Calculator

Enter battery size, current charge, target charge, and charger power.

Battery capacity (kWh)

Charge from (%)

Charge to (%)

Charger power (kW)

Charging efficiency (%)

Energy needed —

Estimated charge time —

Miles of range per hour of charging —

Time = (kWh needed) / (charger kW × efficiency). DC fast charging slows above 80% SOC. Level 1 is best for overnight top-ups. Level 2 is the home charging sweet spot.

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Charger Speeds

Level	Power	Miles/Hour	Use Case
Level 1 (120V)	1.2–1.4 kW	3–5 mi/hr	Emergency / overnight
Level 2 (240V 32A)	7.7 kW	25–30 mi/hr	Home overnight
Level 2 (240V 48A)	11.5 kW	35–45 mi/hr	Home fast
DC Fast 50kW	50 kW	150–200 mi/hr	Road trip stop
DC Fast 150kW	150 kW	400–600 mi/hr	Quick top-up
DC Fast 250kW	250 kW	700–1000 mi/hr	Ultra-fast

How Long Does It Take to Charge an EV?

EV charging time depends on three factors: battery size, charger power, and charging efficiency. A 75 kWh battery charging from 20% to 80% needs 45 kWh of energy.

At Level 2 (7.7 kW), that takes about 6.5 hours. At a 150 kW DC fast charger, about 20 minutes. DC fast charging slows significantly above 80% state of charge to protect the battery.

Charging time = (battery capacity in kWh × depth of discharge) / charger power (kW). A 75 kWh battery at 20% state of charge (80% depth of discharge) on a 7.2 kW Level 2 charger: time = (75 × 0.80) / 7.2 = 60 / 7.2 = 8.3 hours to full charge.

Charger levels: Level 1 (120V/12A) delivers 1.4 kW — adds 4–5 miles of range per hour, sufficient for overnight top-ups for short daily commuters. Level 2 (240V) delivers 3.3–19.2 kW depending on vehicle's onboard charger and EVSE rating — 20–60+ miles per hour. DC Fast Charging (DCFC) delivers 50–350 kW directly to the battery — 150–250 miles in 20–30 minutes for compatible vehicles.

Onboard charger limitation: even if your EVSE delivers 11.5 kW, the car can only accept what its onboard AC-DC converter allows. A car with a 7.2 kW onboard charger will charge at 7.2 kW maximum on any Level 2 EVSE above that rating. Fast DC charging bypasses the onboard charger entirely.

Battery management system (BMS) slows charging near 80% and below 20% to protect cell chemistry. Practical charging from 20%–80% is faster than the displayed average; slowing near the top means 0–100% takes significantly longer than the midrange rate implies.