Ampere-hour to Milliampere-hour Converter

1 ampere-hour is exactly 1000 milliampere-hours. Convert ampere-hours (Ah) to milliampere-hours (mAh) below: type a value and the result updates as you type.

Ah to mAh calculator

Result

Ampere-hour to Milliampere-hour conversion

1 Ah = 1000 mAhone ampere-hour in milliampere-hours

1 mAh = 0.001 Ahone milliampere-hour in ampere-hours

Ampere-hour (Ah): The charge of one ampere flowing for one hour: exactly 3600 C. Car and storage batteries are rated in Ah.

Milliampere-hour (mAh): One thousandth of an ampere-hour: exactly 3.6 C. Phone and power bank batteries are rated in mAh.

Source:SI Brochure, 9th edition (BIPM, 2019)

How to convert ampere-hours to milliampere-hours

To convert ampere-hours to milliampere-hours, multiply the number of ampere-hours by 1000.

Formula

mAh = Ah × 1000

Examples

5 Ah = 5 × 1000 = 5000 mAh
25 Ah = 25 × 1000 = 25000 mAh
100 Ah = 100 × 1000 = 100000 mAh

Ampere-hour to Milliampere-hour conversion table

Ampere-hour to Milliampere-hour
Ampere-hour (Ah)	Milliampere-hour (mAh)
0.1 Ah	100 mAh
0.5 Ah	500 mAh
1 Ah	1000 mAh
2 Ah	2000 mAh
3 Ah	3000 mAh
5 Ah	5000 mAh
10 Ah	10000 mAh
20 Ah	20000 mAh
25 Ah	25000 mAh
50 Ah	50000 mAh
100 Ah	100000 mAh
250 Ah	250000 mAh
500 Ah	500000 mAh
1000 Ah	1000000 mAh

Values rounded to 10 significant digits where needed.

Frequently asked questions

How many milliampere-hours are in one ampere-hour?: One ampere-hour is exactly 1000 milliampere-hours.
How do I convert milliampere-hours to ampere-hours?: To convert milliampere-hours to ampere-hours, multiply the number of milliampere-hours by 0.001. The formula is Ah = mAh × 0.001.
Is this conversion exact?: Yes. Both units have exact definitions and the factor 1000 is exact. Displayed results are only rounded when they have many decimal places.
Which is larger, a ampere-hour or a milliampere-hour?: A ampere-hour is 1000 times larger than a milliampere-hour. In other words, a milliampere-hour is exactly 1/1000 of a ampere-hour.