Conversion method
Electric charge Q = I × t for constant current. Ampere-hours measure charge, not energy; energy also requires voltage.
Ah = x × 0.0002777777777777778
10 C = 0.002778 Ah.
| C | Ah |
|---|---|
| 1 | 0.000278 |
| 5 | 0.001389 |
| 10 | 0.002778 |
| 25 | 0.006944 |
| 50 | 0.013889 |
| 100 | 0.027778 |
Unit definitions and sources
Electric charge Q = I × t for constant current. Ampere-hours measure charge, not energy; energy also requires voltage.
| Unit and system | Use | Definition | Relationship |
|---|---|---|---|
| Coulomb (C); si | Common units | Coulomb: base (c) = value × 1. Common use: Electric Charge. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Ampere hour (Ah); si | Common units | Ampere hour: base (c) = value × 3600. Common use: Electric Charge. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Milliampere hour (mAh); si | Specialist units | Milliampere hour: base (c) = value × 3.6. Common use: Electric Charge. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Millicoulomb (mC); si | Specialist units | Millicoulomb: base (c) = value × 0.001. Common use: Electric Charge. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Microcoulomb (µC); si | Specialist units | Microcoulomb: base (c) = value × 1e-06. Common use: Electric Charge. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Nanocoulomb (nC); si | Specialist units | Nanocoulomb: base (c) = value × 1e-09. Common use: Electric Charge. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Elementary charge (e); si | Specialist units | Elementary charge: base (c) = value × 1.602176634e-19. Common use: Electric Charge. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Exacoulomb (EC); si | Specialist units | exacoulomb: E denotes 10^18; the unit gives 1000000000000000000 c. Common use: Electric Charge. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Petacoulomb (PC); si | Specialist units | petacoulomb: P denotes 10^15; the unit gives 1000000000000000 c. Common use: Electric Charge. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Teracoulomb (TC); si | Specialist units | teracoulomb: T denotes 10^12; the unit gives 1000000000000 c. Common use: Electric Charge. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Gigacoulomb (GC); si | Specialist units | gigacoulomb: G denotes 10^9; the unit gives 1000000000 c. Common use: Electric Charge. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Megacoulomb (MC); si | Specialist units | megacoulomb: M denotes 10^6; the unit gives 1000000 c. Common use: Electric Charge. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Kilocoulomb (kC); si | Specialist units | kilocoulomb: k denotes 10^3; the unit gives 1000 c. Common use: Electric Charge. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Hectocoulomb (hC); si | Specialist units | hectocoulomb: h denotes 10^2; the unit gives 100 c. Common use: Electric Charge. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Decacoulomb (daC); si | Specialist units | decacoulomb: da denotes 10^1; the unit gives 10 c. Common use: Electric Charge. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Decicoulomb (dC); si | Specialist units | decicoulomb: d denotes 10^-1; the unit gives 0.1 c. Common use: Electric Charge. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Centicoulomb (cC); si | Specialist units | centicoulomb: c denotes 10^-2; the unit gives 0.01 c. Common use: Electric Charge. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Picocoulomb (pC); si | Specialist units | picocoulomb: p denotes 10^-12; the unit gives 1e-12 c. Common use: Electric Charge. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Femtocoulomb (fC); si | Specialist units | femtocoulomb: f denotes 10^-15; the unit gives 1e-15 c. Common use: Electric Charge. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Attocoulomb (aC); si | Specialist units | attocoulomb: a denotes 10^-18; the unit gives 1e-18 c. Common use: Electric Charge. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Ampere-minute (A·min); other | Specialist units | ampere-minute = 60.0 c, derived from the component SI/customary definitions. Common use: Electric Charge. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
| Ampere-second (A·s); other | Specialist units | ampere-second = 1.0 c, derived from the component SI/customary definitions. Common use: Electric Charge. Source checked 2026-09-20 (implementation review). | Exact definition; numerical display may be rounded |
Sources: NIST: SP 811 Appendix B.8: conversion factors; BIPM: SI prefixes
Precision of electric charge conversions
All 22 electric charge units convert through Coulomb (C). 22 have an exact defined relationship to the base unit and 0 are conventional or measured values. Results and the tables on this page come from the same engine, so a table value can be checked against the converter directly.
Standard display shows up to six decimal places, switching to scientific notation for very large or small values. Calculation uses JavaScript binary floating point independently of display rounding, so extra digits are not a claim about measurement accuracy. Each unit lists its own source; a citation records where the definition comes from, not an independent review. See Conversion methodology for the review and correction process.