mWh To mAh Calculator: Convert milli Watt-hours To milli Amp-hours

When dealing with laptops, power banks, smartphones, and other small electronics, you will sometimes need to convert battery capacity from mWh to mAh (milli Watt-hours to milli Amp-hours). To help you out with this conversion, we prepared these 2 online tools you can use yourself anytime:

1. mWh to mAh calculator. You simply input mWh and voltage (usually 3.7V, 5V, 12V), and you will get the mAh immediately.
2. mWh to mAh conversion chart. We converted mWh to mAh at 3.7V, 5V, and 12V voltages (ranging from 1 mWh to 1,000,000 mWh), and gathered all the results in a neat conversion chart you can freely use.

Quick example: MacBook Air M2 laptop has a 52,600 mWh battery capacity at 11.2V. How many mAh is that? We simply divide 52,600 mWh by 11.2V and see that this MacBook laptop has a 4,696 mAh battery capacity.

Namely, the mWh to mAh conversion depends solemnly on voltage (we will explain how voltage affects this conversion). Here is the online mWh to mAh you can use to make the conversion (we will show you an example of how to do it below the calculator):

Here is how this calculator works:

Let’s say you have a 58,830 mWh power station for camping or emergency backup. These power stations usually run on 12V batteries. To convert 58,830 mWh to mAh, just insert ‘58830’ in the 1st mWh input field and ’12’ in the 2nd voltage field. You get the result in this format (screenshot):

We can immediately see that 58,830 mWh at 12V is equal to 4,903 mAh. You can find a similar calculator in reverse – converting mAh to mWh – here.

Let’s look at the formula for mWh to mAh conversion and the difference between these two battery capacity units:

mWh To mAh Formula: Difference Between mAh And mWh

Alright, battery capacities for small electronics such as smartphones, smartwatches, etc. are commonly expressed in either mWh or mAh (milli Watt-hours or milli Amp-hours).

Here is the equation that converts mWh to mAh:

mAh = mWh / V

Basically, to get mAh from mWh, we need to divide mWh by the voltage of the system. That means that the voltage determines mWh to mAh conversion. Here are 3 examples of how voltage determines this conversion:

• 1 mWh at 3.7V is equal to 0.27 mAh.
• 1 mWh at 5V is equal to 0.20 mAh.
• 1 mWh at 12V is equal to 0.08 mAh.

We see that the higher voltage we have, the lower mAh we get for the same mWh.

To help everybody out, we have converted the most common mWh (ranging from 1 to 1,000,000 mWh) into mAh at 3 different voltages (3.7V, 5V, and 12V). Here is the complete conversion chart:

mWh To mAh Conversion Chart