Charge & battery capacity converter
Charge & battery capacity Converter – 7 Units, Exact Factors
1 milliampere-hour = 0.001 ampere-hours
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- 1 mA·h = 0.001 A·h
- 5 mA·h = 0.005 A·h
- 10 mA·h = 0.01 A·h
- 25 mA·h = 0.025 A·h
- CoulombsC
- MillicoulombsmC
- MicrocoulombsµC
- NanocoulombsnC
- Ampere-hoursA·h
- Milliampere-hoursmA·h
- Elementary chargese
- Coulombs3.6C
- Millicoulombs3,600mC
- Microcoulombs3,600,000µC
- Nanocoulombs3,600,000,000nC
- Ampere-hours0.001A·h
- Milliampere-hours1mA·h
- Elementary chargese
About charge & battery capacity conversions
Electric charge and battery capacity. 1 Ah = 3,600 C exactly. Watt-hours (energy) also depend on voltage, so they are in the energy converter.
Common charge & battery capacity conversions
Charge & battery capacity units explained
| Unit | System | Definition and notes |
|---|---|---|
| Coulomb (C) | SI (metric) | Base unitThe SI unit of electric charge: 1 A·s. |
| Millicoulomb (mC) | SI (metric) | 1 mC = 0.001 C (exact) |
| Microcoulomb (µC) | SI (metric) | 1 µC = 0.000001 C (exact) |
| Nanocoulomb (nC) | SI (metric) | 1 nC = 1 × 10⁻⁹ C (exact) |
| Ampere-hour (A·h) | other | 1 A·h = 3,600 C (exact)Defined as exactly 3,600 C. Battery capacity unit. |
| Milliampere-hour (mA·h) | other | 1 mA·h = 3.6 C (exact)Defined as exactly 3.6 C. Phone and small battery capacities. |
| Elementary charge (e) | other | 1 e = 1.602176634 × 10⁻¹⁹ C (exact)The charge of a single proton: exactly 1.602176634 × 10⁻¹⁹ C, fixed when the SI was redefined in 2019. |
Milliampere-hours to ampere-hours conversion table
| Milliampere-hours (mA·h) | Ampere-hours (A·h) |
|---|---|
| 100 mA·h | 0.1 A·h |
| 500 mA·h | 0.5 A·h |
| 1,000 mA·h | 1 A·h |
| 1,500 mA·h | 1.5 A·h |
| 2,000 mA·h | 2 A·h |
| 2,500 mA·h | 2.5 A·h |
| 3,000 mA·h | 3 A·h |
| 3,500 mA·h | 3.5 A·h |
| 4,000 mA·h | 4 A·h |
| 4,500 mA·h | 4.5 A·h |
| 5,000 mA·h | 5 A·h |
| 10,000 mA·h | 10 A·h |
| 20,000 mA·h | 20 A·h |
Frequently asked questions
Which charge & battery capacity units can I convert?
coulombs (C), millicoulombs (mC), microcoulombs (µC), nanocoulombs (nC), ampere-hours (A·h), milliampere-hours (mA·h), elementary charges (e).
How accurate are the results?
Every unit is stored with its exact defining factor (NIST SP 811, NIST Handbook 44 or the BIPM SI Brochure). Calculations use double-precision arithmetic and are rounded only for display, to 5 significant figures by default (trailing zeros dropped, so 1 km shows as 1000 m). You can choose Auto (up to 10 digits), fixed decimals or more significant figures, or switch to scientific or engineering notation.
How many coulombs are in a milliamp-hour?
Exactly 3.6 C. One ampere for one hour is 3 600 C, so 1 mAh = 3.6 C and a 5 000 mAh battery holds 18 000 C. Energy also depends on voltage: Wh = Ah × V.