# How to convert Ah to mAh

How to convert from electric charge of ampere-hour (Ah) to milliampere-hour (mAh).

### Ampere-hour to milliampere-hour calculation formula

The electric charge *Q*_{(mAh)} in milliampere-hours (mAh) is equal to the electric charge *Q*_{(Ah) }in ampere-hours (Ah) times 1000:

*Q*_{(mAh)} = *Q*_{(Ah)} × 1000

So milliamp-hour is equal to amp-hour times 1000mAh/Ah:

milliamp-hour = amp-hour × 1000

or

mAh = Ah × 1000

#### Example

Convert electric charge of 3 amp-hour to milliamp-hour:

The electric charge Q is equal to 3 amp-hour times 1000:

*Q* = 3Ah × 1000 = 3000mAh