You might often struggle when comparing battery capacity between devices rated in different units, milliamp-hours (mAh) and watt-hours (Wh). Small electrical devices with small batteries often use mAh as their energy capacity. That includes a smartphone, power bank, camera, and so on, while most laptops and high-powered battery packs use a Wh unit instead.
To convert energy capacity rated in mAh to Wh, use the conversion calculator above by entering the battery's mAh and its voltage into input boxes. The Wh value will automatically calculate as you fill them in.
mAh to Wh Formula
Here is the formula we used in the calculator to calculate the energy capacity in watt-hours (Wh) by knowing its value in milliamp-hours (mAh) and the source voltage (V).
$$\text{Energy in Wh} = {\text{Energy in mAh} \times \text{Voltage} \above{1pt} 1000}$$
Or
$$Wh = {mAh \times V \above{1pt} 1000}$$
