Watt Hours to Amp Hours Conversion Calculator (Wh to Ah)

Enter the watt-hour energy value and battery voltage to convert watt hours to amp hours.

The load watt hours energy of the battery is measured in Wh, and the amp-hour capacity of the battery is measured in Ah, indicating the output that the current can be maintained for a period of time. Learn more: The Difference in Watt hours and Amp hours

Amp hours(Ah) = Watt hours (Wh) / Voltage (V)

For example, if you have a 1200Wh Lithium battery with 12V, you’d divide watt hours by volts. 1200Wh / 12V = 100Ah, easily get Watt Hours to Amp Hours.

You can also convert Ah to Wh using a similar formula:

Watt hours (Wh) = Amp hours(Ah) * Voltage (V)

Convert Kilowatt Hours to Amp Hours(kWh to Ah)

1 kWh is equal to 1000Wh. You can also use a similar formula to kWh to Ah, as follows:

Capacity(Ah) = Energy(kWh) * 1000 / Voltage(V)

For example: if you want to build a 10kWh 48V solar energy storage system, then how much capacity Ah battery is needed? According to the calculation, Capacity(AH) = 10kWh * 1000/48V, the resulting capacity is about 208.33Ah, which can be verified by using the Kilowatt Hours to Amp Hours calculator. At this point, you can consider choosing a 200Ah or 210Ah battery.

Convert Watt Hours to Milliamp Hours (Wh to mAh)

1Ah is equal to 1000mAh, the calculation formula is:

Capacity(mAh) = Energy(Wh) / Voltage(V) * 1000

For example: you know that your mobile phone specifications are suitable for 3.82V, 10.28Wh battery, want to calculate the mobile phone battery Capacity, after using the Wh to mAh calculator, Capacity(mAh) = 10.28Wh / 3.82V * 1000, by calculation it is about 2691mAh.

Watt Hours to Amp Hours Conversion Charts (at common DC voltages)

Watt Hours to Amp Hours at 12V

Watt Hours to Amp Hours at 24V

Watt Hours to Amp Hours at 36V

Watt Hours to Amp Hours at 48V