Charge Time Calculator

Estimate how long it takes to charge your EV. Select your vehicle, adjust the parameters, and see real-time charge curves modeled from each platform's battery management system.

kWkWh charged

Peak: 190 kW · Avg: 166 kW · Time: 27 min

Make

Model

DCFC Peak kW

190 kW

Charger kW

Battery (kWh)

Start SoC: 10%

End SoC: 80%

Temperature: 75°F(Mild)

Battery preconditioned — most relevant below 50°F

How this is calculated

Formula

effectiveKw(soc) = peakKw × socMultiplier(soc) × tempMultiplier
minutesPerPercent = (batteryKwh / 100) / effectiveKw(soc) × 60
totalMinutes = sum across each 1% SoC step from start → end

Variables in this scenario

Thermal platform: GM Ultium
Vehicle peak DC: 190 kW
Charger output: 190 kW
Effective peak (lower of the two): 190 kW
Temperature: 75°F (Mild), multiplier 1.00×
Preconditioned: No (negligible above 50°F)
SoC range: 10% → 80% on a 102 kWh pack
Result: 27 min at an average of 166 kW

State-of-charge taper curve

The BMS protects the battery by tapering current as cells fill up. Below is the generalized taper curve we apply on top of your vehicle's peak kW and the temperature multiplier.

SoC %	0	5	10	15	50	55	60	70	80	85	90	95	100
Multiplier	0.50	0.75	0.95	1.00	0.95	0.88	0.82	0.65	0.50	0.38	0.28	0.18	0.10

Highlighted columns are inside your selected SoC range. Notice the steep drop after 80% — this is why most charging guides recommend stopping there on road trips.

Why does charging slow down?

The vehicle's Battery Management System (BMS) actively limits current to protect cells from overheating, lithium plating at low temperatures, and damage near full charge. Read about how BMS shapes DC fast charging →