Authoritative definitions of the International System of Units and SI prefixes.
Dedicated unit pair
Milliampere-hours to Ampere-hours
Convert mAh to Ah instantly, then review the formula, assumptions, and rounding guidance.
Electrical unitsInstant result
Decimals
Formula result = input × 3.6 ÷ 3600. 1 mAh = 0.001 Ah
Common examples
One value, several units
Coulombs3.6 C
Millicoulombs3,600 mC
Microcoulombs3,600,000 µC
Ampere-hours0.001 Ah
Conversion table
| 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 |
Conversion chart
1 mAh0.001 Ah
5 mAh0.005 Ah
10 mAh0.01 Ah
25 mAh0.025 Ah
50 mAh0.05 Ah
Worked example
1 ampere-hour equals exactly 3,600 coulombs.
Unit definition
Milliampere-hours (mAh) One milliampere-hours equals 3.6 coulomb.
Unit history
Milliampere-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 mAh to coulomb.
3. Convert the base value to Ah and apply your display precision.
Understand the result before using it
Milliampere-hours to Ampere-hours converts a value measured in Milliampere-hours (mAh) into the equivalent value in Ampere-hours (Ah). 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 × 3.6 ÷ 3600
Assumptions
- Milliampere-hours and Ampere-hours represent the same electric charge quantity.
- The input is expressed in mAh; the output is expressed in Ah.
- The unit definitions and conventional relationship shown on this page apply.
Worked example
1 mAh = 0.001 Ah. 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 mAh measurement in a document that expects Ah.
- Compare a milliampere-hours value with a value reported in ampere-hours.
- Check the mAh-to-Ah arithmetic before copying the result into another calculation.
Limitations
Common mistakes to avoid
- Do not confuse mAh 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 Milliampere-hours to Ampere-hours?
result = input × 3.6 ÷ 3600 Using the displayed relationship, 1 mAh equals 0.001 Ah.
How many Ampere-hours are in one Milliampere-hours?
One Milliampere-hours is 0.001 Ampere-hours. The displayed digits may be rounded.
Can I reverse the mAh to Ah conversion?
Yes. Swap the source and target units in the converter. The reverse relationship converts Ah back to mAh.
Is the Milliampere-hours to Ampere-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.