Battery Charge Time Calculator

Calculate Charging Time The time required to charge a battery pack based on its capacity (Wh, kWh, Ah, or mAh) and the charging current (A or mA).

  • Watt-hours (Wh)
  • Kilowatt-hours (kWh)
  • Amp-hours (Ah)
  • Milli amp-hours (mAh)
  • Amps (A)
  • Milli amps (mA)

Battery Charging Time Calculator

This calculator helps you estimate the time required to charge a battery pack based on its capacity, charging current, and current state of charge (SoC). It supports various units for battery capacity (Wh, kWh, Ah, mAh) and charging current (A, mA).

How to Use

  1. Enter the battery capacity in the desired unit (Wh, kWh, Ah, or mAh).
  2. If the capacity is entered in Wh or kWh, an additional field for battery voltage (V) will appear. Enter the nominal voltage of the battery pack.
  3. Enter the charging current in the desired unit (A or mA).
  4. If the battery is not fully discharged, enter the current state of charge (SoC) as a percentage.
  5. The calculator will instantly display the estimated charging time in hours and minutes.


The calculator uses the following formulas to calculate the charging time:

Capacity ( Ah ) = Capacity ( Wh ) Voltage ( V )

Remaining Capacity ( Ah ) = Capacity ( Ah ) ( 1 - SoC (%) 100 )

Charging Time ( hours ) = Remaining Capacity ( Ah ) Charging Current ( A )


This calculator provides an estimated charging time based on the provided inputs and assumes ideal conditions.

Actual charging times may vary depending on factors such as battery health, charger efficiency, temperature, and other environmental factors.

Always refer to the manufacturer's specifications and guidelines for accurate charging information.

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