Milliwatt Hours to Milliamp Hours (mWh to mAh) Conversion Calculator

Use our calculator to easily convert milliwatt hours to milliamp hours (mWh to mAh).

Milliwatt Hours to Milliamp Hours Conversion Calculator

Error: This field is required.
Error: This field is required.
milliamp hours
Conversion formula: mAh = mWh ÷ V

Or would you rather convert milliamp hours to milliwatt hours?

Milliwatt Hours to Milliamp Hours Conversion Table

Here is a conversion table converting milliwatt hours to milliamp hours at common voltages.

Milliwatt Hours (mWh)Milliamp Hours (mAh) @ 3.7VMilliamp Hours (mAh) @ 5V
1000 mWh270.27 mAh200 mAh
2000 mWh540.541 mAh400 mAh
3000 mWh810.811 mAh600 mAh
4000 mWh1081.081 mAh800 mAh
5000 mWh1351.351 mAh1000 mAh
6000 mWh1621.622 mAh1200 mAh
7000 mWh1891.892 mAh1400 mAh
8000 mWh2162.162 mAh1600 mAh
9000 mWh2432.432 mAh1800 mAh
10000 mWh2702.703 mAh2000 mAh
20000 mWh5405.405 mAh4000 mAh
30000 mWh8108.108 mAh6000 mAh
40000 mWh10810.811 mAh8000 mAh
50000 mWh13513.514 mAh10000 mAh
60000 mWh16216.216 mAh12000 mAh
70000 mWh18918.919 mAh14000 mAh

Note: Don't see the values you're looking for in this table? Use our mWh to mAh calculator at the top of this page to calculate them for your specific scenario.

How to Convert Milliwatt Hours to Milliamp Hours (mWh to mAh)

To convert milliwatt hours to milliamp hours, divide milliwatt hours by volts.

Conversion formula: milliamp hours = milliwatt hours ÷ volts

Abbreviated formula: mAh = mWh ÷ V


For example, in a teardown, one of the early-generation versions of the AirPods was revealed to contain a 93 milliwatt-hour battery. While the teardown unfortunately did not reveal the battery's voltage, let's just assume it's 3.7 volts, which is a common voltage for the lithium-ion batteries found in portable electronics.

To find the AirPods battery capacity in milliamp hours, we'd do the following:

93 mWh ÷ 3.7 V = 25.135 mAh

So the older-gen AirPods had a battery capacity of around 25.14 mAh.

Why Convert Milliwatt Hours to Milliamp Hours?

Because battery capacity of small devices is more commonly expressed in milliamp hours, many people might want to convert mWh to mAh simply to put the capacity in units that they're more familiar with.

However, milliwatt hours -- or watt hours -- are more informative since they take into account both milliamp hours and voltage, so I'd strongly recommend keeping units in milliwatt hours when comparing battery capacities.

If you do compare the milliamp hour capacity of different devices, make sure they have the same battery voltage. Otherwise it isn't an apples-to-apples comparison.

Converting milliamp hours to milliwatt hours can be useful when estimating battery runtime.

For instance, let's say you want to use a 3.7V, 20,000mWh battery to power a device that draws 500mA. To figure out how long the battery will last, you first need to convert the battery's milliwatt hours to milliamp hours.

20,000 mWh ÷ 3.7 V ≈ 5,405 mAh

Now that you know the battery's milliamp hour capacity, you can estimate its runtime by doing the following calculation:

5,405 mAh ÷ 500 mA ≈ 10.8 hrs

Your battery will be able to power the device for around 10.8 hours before needing to be recharged. Again, the caveat here is that the device's voltage needs to be identical to the battery voltage. Otherwise, the device may be consuming current at a different voltage and thus different wattage, which would throw off this estimation.

How to Convert Milliamp Hours to Milliwatt Hours (mAh to mWh)

And what about converting the other way?

To convert milliamp hours to milliwatt hours, multiply milliamp hours by volts.

Conversion formula: milliwatt hours = milliamp hours × volts

Abbreviated formula: mWh = mAh × V


Suppose you have a smartphone with a 4000 mAh, 3.7V lithium-ion battery.

To find your phone's battery capacity in milliwatt hours, you'd multiply the battery's milliamp hours by its voltage:

4000 mAh × 3.7 V = 14800 mWh

Your smartphone's battery stores 14,800 milliwatt hours.

That's all there is to it. 😊

Share This Article
Alex Beale
Alex Beale
Alex Beale is the founder and owner of Footprint Hero. As a self-taught DIY solar enthusiast, Alex has spent 4 years producing educational solar content across YouTube, TikTok, Instagram, and the Footprint Hero blog. During that time, he's built Footprint Hero to over 7 million blog visits and 18 million YouTube views. He lives in Tennessee.