Watt-Hours (Wh) to Milliamp-Hours (mAh) Conversion Calculator
Convert watt-hours to milliamp-hours by entering the energy in watt-hours and the battery terminal voltage below.
How to Convert Watt-Hours to Milliamp-Hours
Although it is impossible to measure the internal characteristics of a battery because it is a closed system, we can use the observable parameters at the battery’s terminals to estimate internal measurements, such as the stored charge and total energy capacity.
The watt-hour capacity of a battery, expressed as Wh or W·h, is a measure of the amount of energy being supplied to the load. It is a measure of the total electrical power the battery can supply for an hour or the total duration for which it can supply a specific load.
The milliampere-hour capacity of a battery describes the duration for which a battery can supply one milliampere of current and the maximum amount of current it can supply for one hour.
For example, a 10 mAh of capacity means that the battery can supply a load of 10 milliamperes for one hour before losing all its charge, or it can indicate that the battery can supply a 1 milliampere current to a load for 10 hours. The electric charge for smaller batteries is generally measured in milliamp-hours, abbreviated mAh or mA·h.
Wh to mAh Conversion Formula
To convert from energy to electrical charge, use the formula below in conjunction with the voltage.
Q(mAh) = E(Wh) × 1,000 / V(V)
Thus, the charge in milliamp-hours is equal to the watt-hours times 1,000, then divided by the voltage.
You can also convert mAh to Wh using a similar formula.
For example, let’s convert 10 Wh at 12 V to mAh.
Q(mAh) = 10 Wh × 1,000 / 12 V
Q(mAh) = 10,000 mWh / 12 V
Q(mAh) = 833.33 mAh
So, 10 watt-hours of energy at 12 volts is equal to a charge of 833.33 milliamp-hours.
Give our kilowatt-hours to amp-hours calculator a try.