mAh to Ampere-hours Converter
Convert milliampere-hour to ampere-hour instantly. 1 mAh = 0.001 Ah, worked steps and a full reference table.
How to use it
- Type the value in milliampere-hour — the result updates as you type.
- Use Swap to flip the direction, or change either dropdown to convert between any two units.
- Click the result to copy it. The URL updates too, so you can bookmark or share the exact conversion.
Examples
| 1 mAh | 0.001 Ah |
| 5 mAh | 0.005 Ah |
| 10 mAh | 0.01 Ah |
| 100 mAh | 0.1 Ah |
One milliampere-hour equals 0.001 ampere-hours (Ah). To convert milliampere-hours to ampere-hours, multiply by 0.001; to go back the other way, multiply by 1000 instead.
The converter above does it as you type and shows the working underneath, so you can check the arithmetic rather than take the number on trust.
What milliampere-hours and ampere-hours actually measure
Milliampere-hour (mAh) — A milliamp-hour is a thousandth of an amp-hour. Phone, laptop and power bank capacity ratings.
Ampere-hour (Ah) — An amp-hour is one amp sustained for an hour — 3,600 coulombs. Car and deep-cycle battery capacity.
mAh to Ampere-hours conversion table
The most common values, worked out in advance. Anything not listed can be typed straight into the converter.
| mAh | Ah |
|---|---|
| 1 mAh | 0.001 Ah |
| 2 mAh | 0.002 Ah |
| 5 mAh | 0.005 Ah |
| 10 mAh | 0.01 Ah |
| 25 mAh | 0.025 Ah |
| 50 mAh | 0.05 Ah |
| 100 mAh | 0.1 Ah |
How to convert milliampere-hours to ampere-hours by hand
Multiply the number of milliampere-hours by 0.001.
For example, 25 mAh × 0.001 = 0.025 Ah.
Going the other way, divide by 0.001 — or multiply by 1000, which is the same thing and easier to do in your head.
Everything runs in your browser
There is no server involved in the calculation. The numbers you type never leave your device, nothing is logged, and the page keeps working with no connection once it has loaded. That is not a marketing line — it is simply how the tool is built, because a calculation like this has no reason to touch a network.
Questions people ask
How many Ah are in 1 mAh?
1 mAh equals exactly 0.001 Ah. Multiply any value in milliampere-hour by 0.001 to get ampere-hour.
Is anything uploaded to a server?
No. The whole calculation happens in your browser. Nothing is sent anywhere, and the page keeps working offline once loaded.
Last updated 18 August 2026