Charge & battery capacity converter
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.
1 milliampere-hour = 0.001 ampere-hours
How it’s calculated
A·h = mA·h × 0.001
- Multiply the value in milliampere-hours by 0.001.
- To go back, divide by 0.001 (or multiply by 1000).
- 1 mA·h = 0.001 A·h · 1 A·h = 1,000 mA·h
Show worked solutionFactor, unit cancellation and rounding, step by step
Find the conversion factor
By definition 1 mA·h = 3.6 C and 1 A·h = 3600 C, so 1 A·h = 1000 mA·h. Source: NIST SP 811 / Handbook 44.
Multiply by the factor written as a fraction
Put mA·h in the denominator so it cancels, leaving A·h.
Calculate (unrounded)
Round the answer
Rounded to 5 significant figures.
Answer: 0.001 A·h
1 mA·h in other units
Batch convert mA·h → A·h
- 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
Common charge & battery capacity conversions
Charge & battery capacity units and exact definitions
| Unit | System | Definition |
|---|---|---|
| Coulomb (C) | SI (metric) | Base unit |
| Millicoulomb (mC) | SI (metric) | 1 mC = 0.001 C |
| Microcoulomb (µC) | SI (metric) | 1 µC = 0.000001 C |
| Nanocoulomb (nC) | SI (metric) | 1 nC = 1e-9 C |
| Ampere-hour (A·h) | other | 1 A·h = 3600 C |
| Milliampere-hour (mA·h) | other | 1 mA·h = 3.6 C |
| Elementary charge (e) | other | 1 e = 1.602176634e-19 C |
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.