Milliamps to Milliamp Hours (mA to mAh) Conversion Calculator

Use our calculator to easily convert milliamps to milliamp hours (mA to mAh).

Milliamps to Milliamp Hours Conversion Calculator

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milliamp hours
Conversion formula: mAh = mA × hrs

Or would you rather convert milliamp hours to milliamps?

Milliamps to Milliamp Hours Conversion Table

Here is a conversion table converting common values of milliamps to milliamp hours, over a duration of 1 hour and 1 day.

Milliamps (mA)Milliamp Hours (mAh) @ 1 hourMilliamp Hours (mAh) @ 1 day
100 mA100 mAh2400 mAh
200 mA200 mAh4800 mAh
300 mA300 mAh7200 mAh
400 mA400 mAh9600 mAh
500 mA500 mAh12,000 mAh
600 mA600 mAh14,400 mAh
700 mA700 mAh16,800 mAh
800 mA800 mAh19,200 mAh
900 mA900 mAh21,600 mAh
1000 mA1000 mAh24,000 mAh
1100 mA1100 mAh26,400 mAh
1200 mA1200 mAh28,800 mAh
1300 mA1300 mAh31,200 mAh
1400 mA1400 mAh33,600 mAh
1500 mA1500 mAh36,000 mAh
1600 mA1600 mAh38,400 mAh
1700 mA1700 mAh40,800 mAh
1800 mA1800 mAh43,200 mAh
1900 mA1900 mAh45,600 mAh
2000 mA2000 mAh48,000 mAh

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

How to Convert Milliamps to Milliamp Hours (mA to mAh)

To convert milliamps to milliamp hours, multiply milliamps by hours.

Conversion formula: milliamp hours = milliamps × hours

Abbreviated formula: mAh = mA × hrs


If you have a device drawing 200 milliamps of current and it runs for 3 hours, you can do the following to calculate the milliamp hours used:

200 mA × 3 hrs = 600 mAh

So the device has used 600 milliamp hours.

That's it!

Why Convert Milliamps to Milliamp Hours?

Converting milliamps to milliamp hours can be useful when you're trying to determine how much energy a device consumes.

Let's look at a practical example. Imagine you have some LED string lights that use 500 milliamps, and you run them for 6 hours a day.

How many milliamp hours do they use each day?

500 mA × 6 hrs = 3000 mAh

Each day, your string lights consume 3000 milliamp hours.

Note: You'll sometimes see large values of milliamp hours expressed in amp hours. You convert milliamp hours to amp hours by dividing by 1000. So, in this example, you could also say that the lights consume 3 amp hours per day.

Converting milliamps to milliamp hours is also useful when working with batteries. If you know the total amount of current a device uses and you have an idea of how long you want to run the device off a battery, you can estimate battery capacity you need in milliamp hours.

Again, this is best illustrated with an example.

Imagine you want to buy a portable power bank to power a USB camping lantern you have. You look at the lantern's specs and see that it uses 600 milliamps. You want to be able to run it off the power bank for 20 hours.

You can estimate what size power bank you need to buy by calculating the milliamp hours:

600 mA × 20 hrs = 12000 mAh

So you should consider a power bank with a 12,000 mAh capacity or greater.

Note: This is a quick and dirty way to estimate battery capacity. In reality, how much energy a battery can deliver depends on a host of factors like temperature, battery age, and battery type. For a more accurate estimate, check out our battery capacity calculator.

How to Convert Milliamp Hours to Milliamps (mAh to mA)

Doing the reverse calculation is just as easy.

To convert milliamp hours to milliamps, divide milliamp hours by hours.

Conversion formula: milliamps = milliamp hours ÷ hours

Abbreviated formula: mA = mAh ÷ hrs


If you have a battery that has a capacity of 3000 milliamp hours and it powered your device for 6 hours, you can easily figure out how many milliamps the device was using.

3000 mAh ÷ 6 hrs = 500 mA

Your device was using 500 milliamps.

It's important to point out that this is the average current draw of your device. Many devices use variable amounts of power. A fan can run at different speeds, for instance. And a laptop will consume more power the brighter its screen is.

To get further insight into how much current a device is using at any given moment, you'd need to use a measuring device, such as a power meter, to measure its real-time power usage.

How to Convert Milliamps to Amp Hours (mA to Ah)

Larger batteries, such as 12V batteries, will often express their battery capacity in amp hours (Ah) rather than milliamp hours.

To convert milliamps to amp hours, multiply milliamps by hours and then divide by 1000.

Conversion formula: milliamp hours = milliamps × hours ÷ 1000

Abbreviated formula: mAh = mA × hrs ÷ 1000


Imagine you have a water pump that uses 900 milliamps. You use it for around 2 hours per day.

Here's how to calculate the amp hours consumed:

900 mA × 2 hrs ÷ 1000 = 1.8 Ah

Your pump uses 1.8 amp hours per day.

What we're actually doing here in this calculation is converting milliamps to milliamp hours (mA × hrs) and then converting milliamp hours to amp hours (mAh ÷ 1000).

I did the entire calculation in a single step, but feel free to think about it as 2 separate steps if that's helpful.

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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.