How to Calculate Your EV Charging Time

Charging your electric vehicle up to 80% is recommended for better battery health. Below is a step-by-step method for estimating the time it takes to charge your EV, whether charging up to 80% or 100%.

Formula:

1. Determine the usable battery capacity (kWh) of your EV.

2. Find out the charging speed of your charger (kW).

3. Use this simple calculation to determine charging time:

   
   For 80% Charge:

Usable battery capacity × 0.8 (for 80%) = Energy needed (kWh)

Energy needed (kWh) / Charger speed (kW) = Charging time (hours)

            For 100% Charge:

Usable battery capacity × 0.8 (for 80%) = Energy needed (kWh)

Example: For a Tesla Model Y with a usable battery size of 75 kWh and a charger with 11 kW output:

1. Charging to 80%:

   • Energy needed = 75 kWh × 0.8 = 60 kWh
   • Charging time = 60 kWh / 11 kW = 5.45 hours (5 hours and 27 minutes)

2. Charging to 100%:

   • Energy needed = 75 kWh
   • Charging time = 75 kWh / 11 kW = 6.82 hours (6 hours and 49 minutes)

Quick Tip: To convert decimals to minutes, multiply by 60. For example, 0.45 hours × 60 = 27 minutes.