Amps to Milliamp Hours (A to mAh) Conversion Calculator

Use our calculator to easily convert amps to milliamp hours (A to mAh).

Amps to Milliamp Hours Conversion Calculator

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milliamp hours
Conversion formula: mAh = A Ã— hrs Ã— 1000

Or would you rather convert milliamp hours to amps?

Amps to Milliamp Hours Conversion Table

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

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

How to Convert Amps to Milliamp Hours (A to mAh)

To convert amps to milliamp hours, multiply amps by hours and then multiply by 1000.

Conversion formula: milliamp hours = amps Ã— hours Ã— 1000

Abbreviated formula: mAh = A Ã— hrs Ã— 1000

Example

Let's say you have a some Bluetooth headphones that consume 0.1 amps, and you've been wearing them for 7 hours.

How many milliamp hours have they used?

`0.1 A Ã— 7 hrs Ã— 1000 = 700 mAh`

So, in this example, your Bluetooth headphones have consumed 700 milliamp hours.

Why Convert Amps to Milliamp Hours?

Converting amps to milliamp hours is useful when determining how much energy a device has consumed

For instance, suppose you have a USB light that draws 2 amps, and you're running it off a 20,000 mAh portable battery pack. You run your light off the battery pack for 3 hours and want to know how many milliamp hours it used.

To find this out, you can do the following calculation:

`2 A Ã— 3 hrs Ã— 1000 = 6000 mAh`

The USB light consumed a total of 6000 milliamp hours. And now you can estimate that your portable battery pack has about 14,000 milliamp hours remaining capacity.

Also, converting amps to mAh is useful for estimating how much energy a battery charger can output in a given period.

Let's say you have a phone charger that outputs 1 amp, and your phone has a 4000 mAh battery. You want to find out how many milliamp hours the phone charger outputs over 2 hours.

`1 A Ã— 2 hrs Ã— 1000 = 2000 mAh`

Over those 2 hours, your phone charger outputs 2000 milliamp hours, which would charge your phone to about 50%.

Note: This phone charger example is simplified because the charger may not be outputting 1 amp continuously over the entire charge cycle. Also, phone chargers often output 1 amp at 5 volts, while phone batteries are typically 3.7V batteries, so we should take voltage into account by converting the battery's capacity from milliamp hours to watt hours and the charging current from amps to watts.

How to Convert Milliamp Hours to Amps (mAh to A)

Need to convert the other way?

To convert milliamp hours to amps, divide milliamp hours by hours and then divide by 1000.

Conversion formula: amps = milliamp hours Ã· hours Ã· 1000

Abbreviated formula: A = mAh Ã· hrs Ã· 1000

Example

Let's say your phone battery is rated at 4000 milliamp hours and it typically lasts for 16 hours.

Of course, your phone uses a variable amount of current depending on what you're doing with it. But how much current does it use on average?

`4000 mAh Ã· 16 hrs Ã· 1,000 = 0.25 A`

So, your phone on average draws 0.25 amps.

How to Convert Amps to Amp Hours (A to Ah)

To convert amps to amp hours, simply multiply amps by hours.

Conversion formula: amp hours = amps Ã— hours

Abbreviated formula: Ah = A Ã— hrs

Calculator: Amps to Amp Hours Conversion Calculator

Example

Let's imagine I have a 12V fan that uses 5 amps and I leave it on 9 hours every night while I'm sleeping.

How many amp hours does the fan use each night?

`5 A Ã— 9 hrs = 45 Ah`

So, each, night, my fan uses 45 amp hours.