Authoritative definitions of the International System of Units and SI prefixes.
Dedicated unit pair
Ampere-hours to Milliampere-hours
Convert Ah to mAh instantly, then review the formula, assumptions, and rounding guidance.
Electrical unitsInstant result
Decimals
Formula result = input × 3600 ÷ 3.6. 1 Ah = 1,000 mAh
Common examples
One value, several units
Coulombs3,600 C
Millicoulombs3,600,000 mC
Microcoulombs3,600,000,000 µC
Milliampere-hours1,000 mAh
Conversion table
| Ah | mAh |
|---|---|
| 1 Ah | 1,000 mAh |
| 2 Ah | 2,000 mAh |
| 5 Ah | 5,000 mAh |
| 10 Ah | 10,000 mAh |
| 25 Ah | 25,000 mAh |
| 50 Ah | 50,000 mAh |
| 100 Ah | 100,000 mAh |
Conversion chart
1 Ah1,000 mAh
5 Ah5,000 mAh
10 Ah10,000 mAh
25 Ah25,000 mAh
50 Ah50,000 mAh
Worked example
1 ampere-hour equals exactly 3,600 coulombs.
Unit definition
Ampere-hours (Ah) One ampere-hours equals 3,600 coulomb.
Unit history
Ampere-hours is represented here using its modern SI definition or an internationally accepted relationship to an SI base unit.
Step by step
1. Parse the value, including fractions.
2. Convert Ah to coulomb.
3. Convert the base value to mAh and apply your display precision.
Understand the result before using it
Ampere-hours to Milliampere-hours converts a value measured in Ampere-hours (Ah) into the equivalent value in Milliampere-hours (mAh). The numerical value changes because the size and definition of the selected unit changes; the underlying quantity does not.
Calculated result
The conversion follows the displayed unit relationship. Display rounding can hide additional digits, and measured inputs cannot become more accurate merely by changing units.
Formula, assumptions, and example
Formula
result = input × 3600 ÷ 3.6
Assumptions
- Ampere-hours and Milliampere-hours represent the same electric charge quantity.
- The input is expressed in Ah; the output is expressed in mAh.
- The unit definitions and conventional relationship shown on this page apply.
Worked example
1 Ah = 1,000 mAh. For another value, apply the same relationship and round only to the precision your source measurement supports.
When to use it
Good uses
- Read a Ah measurement in a document that expects mAh.
- Compare a ampere-hours value with a value reported in milliampere-hours.
- Check the Ah-to-mAh arithmetic before copying the result into another calculation.
Limitations
Common mistakes to avoid
- Do not confuse Ah with another unit that has a similar name or symbol.
- Round the output to a precision justified by the original measurement.
- Verify safety-critical, regulated, laboratory, and contractual conversions against the controlling standard.
Sources and further reading
These references explain the underlying standards or provide authoritative context. Your own contract, institution, clinician, product documentation, local code, or governing standard may be the controlling source.
Guidance on unit names, symbols, conversions, and numerical presentation.
Questions about this calculation
How do I convert Ampere-hours to Milliampere-hours?
result = input × 3600 ÷ 3.6 Using the displayed relationship, 1 Ah equals 1,000 mAh.
How many Milliampere-hours are in one Ampere-hours?
One Ampere-hours is 1,000 Milliampere-hours. The displayed digits may be rounded.
Can I reverse the Ah to mAh conversion?
Yes. Swap the source and target units in the converter. The reverse relationship converts mAh back to Ah.
Is the Ampere-hours to Milliampere-hours result exact?
The conversion follows the displayed unit relationship. Display rounding can hide additional digits, and measured inputs cannot become more accurate merely by changing units.