mAh to Wh calculator

mAh to Wh conversion calculator

Energy Result in Wh

How to convert mAh to Wh using our calculator

Our calculator is designed to convert charge capacity specified in mAh to energy specified in Wh. Click the calculate button after entering the value of charge (mAh) and voltage (V) in their respective fields. You will get the desired Wh value in the field named as Energy result in Wh.

mAh to Wh conversion formula

Wh = mAh × V / 1000

mAh stands for milliamp-hour and it’s the unit of electric charge and commonly used to express the capacity of the small batteries. mAh specify the total amount of charge passing through a point in a certain period of time. A battery with a higher mAh value will power a system for a longer time. It is typically used to specify and describe the total amount of energy retained by a battery.

Wh stands for Watt-hour and it’s another most commonly used and accurate unit for comparing the capacity of batteries having different voltages. It is the voltage (V) provided by a battery, multiplied by current (amps) supplied by a battery for a certain time (usually in hours). Generally, we use mAh for cells and batteries, whereas wH for energy storage systems.

mAH does not indicate the power capacity of a battery as two batteries with the same mAh value may deliver a different amount of energy. We must consider another variable, the Volt, for calculating the power capacity denoted by Wh. Volt refers to the difference in the electric potential between the positive and negative terminals of a battery. It is the force required to overcome the resistance and move the electrons to make the battery work.

Power bank voltage

The voltage of a power bank depends upon the battery cells used and changes from brand to brand. Inside a power bank, the battery cells are either Li-Poly or Li-Ion, both of which are 3.7 Volt. And if the voltage is smaller than the voltage of your device, it won’t charge. It requires a step-up voltage converter to produce a 5 Volt required for charging an external device.

New power banks are now available in the market, supporting the fast-charging features and often delivering a voltage of 9 Volt. Most of the power banks have battery cells internally connected in series to achieve the required voltage. For example, if a power bank has four Li-ion cells connected in series, it will have the overall voltage of 14.8 Volts.

Most people don’t know if they’re allowed to take power banks on planes or not. It is very important to know the Wh value of your power bank to comply with the rules and regulations referring to power banks and batteries in the travel industry. For example, you cannot take a battery exceeding 100 Wh on planes.