Use our calculator to easily convert milliwatt hours to milliamp hours (mWh to mAh).
Milliwatt Hours to Milliamp Hours Conversion Calculator
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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) @ 3.7V||Milliamp Hours (mAh) @ 5V|
|1000 mWh||270.27 mAh||200 mAh|
|2000 mWh||540.541 mAh||400 mAh|
|3000 mWh||810.811 mAh||600 mAh|
|4000 mWh||1081.081 mAh||800 mAh|
|5000 mWh||1351.351 mAh||1000 mAh|
|6000 mWh||1621.622 mAh||1200 mAh|
|7000 mWh||1891.892 mAh||1400 mAh|
|8000 mWh||2162.162 mAh||1600 mAh|
|9000 mWh||2432.432 mAh||1800 mAh|
|10000 mWh||2702.703 mAh||2000 mAh|
|20000 mWh||5405.405 mAh||4000 mAh|
|30000 mWh||8108.108 mAh||6000 mAh|
|40000 mWh||10810.811 mAh||8000 mAh|
|50000 mWh||13513.514 mAh||10000 mAh|
|60000 mWh||16216.216 mAh||12000 mAh|
|70000 mWh||18918.919 mAh||14000 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. 😊