Convert

Milliampere hour to Ampere hour

Exact answer: 1 mAh = 0.001 Ah (exact defined factor)

Milliampere hour and Ampere hour describe the same quantity from the Electric charge family but come from different systems of units. The factor is defined exactly. Charge appears with batteries, power banks, capacitors and in electrical engineering.

Unit console

Convert units with formula, context and precision

UnitCloud is a local measurement lab for everyday work, engineering, IT, energy, mobility and design. Every conversion shows result, formula, base unit, rounding and the common mistake.

What do you want to convert?

From500 mAh

Result0.5 Ah

Factor1 mAh = 0.001 Ah

Source basisBIPM SI Brochure · NIST Guide to SI Appendix B

Examples

01500 mAh = 0.5 Ah

Example value from the reference table. Internal calculation uses stored factors; display output is rounded.

02Common mistake

Ampere hours measure charge, watt hours measure energy. mAh and Wh are only linked through voltage: Wh = Ah × volts. Two batteries with identical mAh can store different amounts of energy.

03Base unit: C

1 mAh = 3.6 C. Then the value is converted through the base unit C into Ampere hour.

Table

Milliampere hour to Ampere hour
Milliampere hour	Ampere hour
500	0.5
1,000	1
2,000	2
3,000	3
5,000	5
20,000	20

Formula

1 mAh = 3.6 C. Then the value is converted through the base unit C into Ampere hour.

Sources

BIPM SI BrochureSI base units, prefixes and official SI context.NIST Guide to SI Appendix BNIST conversion-factor method and non-SI factors.

Related conversions

Ampere hour to Milliampere hourAh → mAhElectric charge Ampere hour to CoulombAh → CElectric charge Coulomb to Ampere hourC → AhElectric charge Milliampere hour to CoulombmAh → CElectric charge

Search and practice paths

FormulaTableExamplesCommon mistakeEveryday/engineeringExcel/CSVBatch converterPrint view

Electric chargeComparing batteries: mAh, Ah and Wh Data rateReading internet speed correctly

Factor origin

Factors come from the stored source family and are not derived from rounded display values.

Rounding rule

UnitCloud keeps calculating with stored factors and rounds only the displayed output by selected precision.

When not to use

Do not use as the sole basis for official, medical, safety-critical or contractual decisions.

Citation

Citation note: UnitCloud, conversion with formula, sources reviewed: September 2026. Electric charge. Source basis: BIPM SI Brochure · NIST Guide to SI Appendix B.

Common questions

What is the factor for Milliampere hour to Ampere hour?

1 mAh = 0.001 Ah

Which formula does Milliampere hour to Ampere hour use?

1 mAh = 3.6 C. Then the value is converted through the base unit C into Ampere hour.

What is the most common mistake?

Ampere hours measure charge, watt hours measure energy. mAh and Wh are only linked through voltage: Wh = Ah × volts. Two batteries with identical mAh can store different amounts of energy.

When should I verify the result?

Do not use as the sole basis for official, medical, safety-critical or contractual decisions.