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Charge Conversion
Tool Description
Charge Conversion is an online electric charge unit converter that supports mutual conversion between coulomb (C), millicoulomb (mC), microcoulomb (μC), nanocoulomb (nC), picocoulomb (pC), ampere-hour (Ah), milliampere-hour (mAh), faraday (Fd), statcoulomb (statC), and elementary charge (e). Enter any value and unit to instantly view corresponding results in all other units, suitable for physics learning, electronic engineering, battery capacity calculation, electrochemistry, and more.
How to Use
- Enter value
Input the value to convert in the input field, supporting integers and decimals, e.g.,
1000,3.6 - Select source unit
Choose the electric charge unit of the current value from the dropdown list (C/mC/μC/nC/pC/Ah/mAh/Fd/statC/e)
- View results
Click the "Convert" button or press Enter, and the result area below will display corresponding values in all units, with a copy button on the right of each result for convenient use
Use Cases
- Physics learning: In electricity courses, Coulomb's law (F=kQ₁Q₂/r²), electric field strength (E=F/q), capacitance definition (C=Q/V), and other formulas involve electric charge. Different problems may use different units, and this tool can quickly complete unit conversions
- Battery & power supply design: Battery capacity is often labeled in ampere-hours (Ah) or milliampere-hours (mAh), requiring conversion to coulombs (C) for charge calculations. For example: a 5,000 mAh power bank stores a charge of 5,000 mAh × 3.6 = 18,000 C
- Electrochemistry & electrolysis: Faraday's laws of electrolysis involve the Faraday constant (1 Fd ≈ 96,485 C/mol). Electrochemical experiments and production require converting faraday units to coulombs or other units, which this tool can quickly accomplish
Key Advantages
- Free & no registration
The online charge converter is completely free; just open the page to use it, with no account registration or software installation required
- Local & private
All conversions are done locally in your browser; your input data is never uploaded to any server, fully protecting your privacy
- Instant results
Conversions happen in real time as you type, with no waiting, and all unit results are shown at a glance
- Full unit coverage
Supports mutual conversion among 10 electric charge units: coulomb (C), millicoulomb (mC), microcoulomb (μC), nanocoulomb (nC), picocoulomb (pC), ampere-hour (Ah), milliampere-hour (mAh), faraday (Fd), statcoulomb (statC), and elementary charge (e)
- High precision
Uses precise mathematical calculation; coulomb-level units follow strict decimal relationships, while ampere-hour and faraday use high-precision conversion factors for accurate and reliable results
- Cross-platform
Works smoothly on desktop, mobile, and tablet; the page is responsive and adapts to any screen, so you can convert charge units anytime, anywhere
Electric Charge Unit Conversion Relationships
The following shows the conversion relationships between electric charge units, with coulomb (C) as the base unit:
| Unit Name | Abbreviation | Conversion Relationship | Equivalent C |
|---|---|---|---|
| Coulomb | C | 1 C = 1 C（基准） | 1 |
| Millicoulomb | mC | 1 mC = 10⁻³ C | 0.001 |
| Microcoulomb | μC | 1 μC = 10⁻⁶ C | 0.000001 |
| Nanocoulomb | nC | 1 nC = 10⁻⁹ C | 1e-9 |
| Picocoulomb | pC | 1 pC = 10⁻¹² C | 1e-12 |
| Ampere-hour | Ah | 1 Ah = 3,600 C | 3,600 |
| Milliampere-hour | mAh | 1 mAh = 3.6 C | 3.6 |
| Faraday | Fd | 1 Fd ≈ 96,485.34 C | 96485.3399 |
| Statcoulomb | statC | 1 statC ≈ 3.33564×10⁻¹⁰ C | 3.33564e-10 |
| Elementary charge | e | 1 e ≈ 1.602176634×10⁻¹⁹ C | 1.602176634e-19 |
Common Electric Charge Reference Values
The following shows common electric charge values in different scenarios for reference comparison:
| Scenario/Object | Typical Charge |
|---|---|
| Single electron charge | ~ 1.602 × 10⁻¹⁹ C |
| Electrostatic discharge (ESD) | ~ 1 C |
| Capacitive touch signal | ~ 10⁻¹² C |
| Mobile phone battery capacity | 1,000 ~ 5,000 mAh |
| E-bike battery | ~ 50 Ah |
| Car starter battery | ~ 60 Ah |
| Single lightning discharge | 1~20 C |
Definition of Coulomb and Electric Charge
Electric charge (symbol Q or q) is one of the fundamental properties of matter, describing how much electricity an object carries. The SI unit of electric charge is the coulomb (symbol C), named after French physicist Charles-Augustin de Coulomb. One coulomb is defined as the amount of charge transported by a constant current of 1 ampere (A) in 1 second, i.e.: 1 C = 1 A·s.
The elementary charge (e) is the smallest unit of electric charge in nature, equal to the absolute value of the positive charge of a proton or the negative charge of an electron, approximately 1.602176634 × 10⁻¹⁹ C. Any object's charge is an integer multiple of the elementary charge. The Faraday constant (Fd) represents the charge carried by 1 mole of electrons, approximately 96,485.3399 C/mol. The statcoulomb (statC or Fr) is the charge unit in the CGS electrostatic system, still used in theoretical physics literature.
FAQ
The coulomb (symbol C) is the standard SI unit of electric charge, named after French physicist Charles-Augustin de Coulomb. 1 C = 1 A·s, meaning the amount of charge transported by a constant current of 1 ampere in 1 second. The coulomb is one of the most fundamental quantities in electricity and electromagnetism. Coulomb's law (F=kQ₁Q₂/r²) describes the force between two point charges.
The conversion relationship between milliampere-hours (mAh) and coulombs (C) is: 1 mAh = 3.6 C, 1 Ah = 3,600 C. Derivation: 1 mA = 0.001 A, 1 hour = 3,600 seconds, so 1 mAh = 0.001 A × 3,600 s = 3.6 A·s = 3.6 C. For example: a 5,000 mAh phone battery stores a charge of 5,000 × 3.6 = 18,000 C.
The Faraday constant (symbol F or Fd) represents the charge carried by 1 mole of electrons, with a value of approximately 96,485.3399 C/mol. In electrochemistry, the Faraday constant is the core constant of Faraday's laws of electrolysis: Q = n·F (where Q is the total charge and n is the number of moles of electrons transferred in the reaction). For example: electrolysis of 1 mole of water (2H₂O → 2H₂ + O₂) requires transferring 4 moles of electrons, consuming a charge of 4 × 96,485.34 ≈ 385,941.36 C.
The statcoulomb (also called franklin or esu, symbol statC or Fr) is the unit of electric charge in the centimeter-gram-second (CGS) electrostatic system. 1 statC ≈ 3.33564 × 10⁻¹⁰ C. In the CGS system, if two equal point charges 1 cm apart experience an electrostatic force of 1 dyne, each charge is 1 statC. The CGS system is still common in classical electromagnetic theory literature but has largely been replaced by the SI system (coulomb) in engineering practice.
No. All conversion calculations are performed entirely in your browser locally using pure JavaScript math. Your input data never leaves your device, so please feel free to use it.
This tool uses JavaScript double-precision floating-point numbers (64-bit IEEE 754) for calculations, which is sufficiently accurate for most everyday scenarios. Conversions between coulomb and millicoulomb, microcoulomb, etc. follow a strict decimal thousand-fold relationship without approximate conversions, so these results are exact within floating-point range. The Faraday constant and statcoulomb conversion factors use high-precision approximate values, with up to 6 significant decimal places retained and excess digits automatically truncated.
Complete conversion in three steps. First, enter the value to convert in the input field, then select its corresponding electric charge unit (C/mC/μC/nC/pC/Ah/mAh/Fd/statC/e) from the dropdown list; next, click the "Convert" button or press Enter, and the result area will immediately list corresponding values for all units, each with a copy button on the right for one-click copying.
It supports 10 common electric charge units. These are coulomb (C), millicoulomb (mC), microcoulomb (μC), nanocoulomb (nC), picocoulomb (pC), ampere-hour (Ah), milliampere-hour (mAh), faraday (Fd), statcoulomb (statC), and elementary charge (e). Any two of these units can be converted bidirectionally, meeting different needs in physics, electronics, and electrochemistry.
Completely free with no registration required. This is a free online electric charge unit converter; just open the page to use it directly. No login, no usage limits, and no software installation needed, making it ideal for daily study and work.
Yes. The page uses a responsive design and works smoothly on desktop, mobile, and tablet. After opening it in a mobile browser, the value entry and unit selection interactions are optimized for touch, so you can convert charge units anytime, anywhere.
An online converter is more efficient and worry-free. Manually converting with a phone calculator requires memorizing different conversion factors (e.g., 1 mAh = 3.6 C, 1 C = 10⁶ μC), which is error-prone. This tool lists results for all 10 units at once and supports one-click copy, especially suitable for comparing multiple notations or batch-checking values.
Because ampere-hour is a "current × time" charge unit. The coulomb is defined as the product of current and time (1 C = 1 A·s), and 1 hour = 3,600 seconds, so 1 Ah = 1 A × 3,600 s = 3,600 C and 1 mAh = 3.6 C. Its multiple relative to C comes from the "hour-to-second" conversion, not a decimal prefix relationship. The other coulomb-level units (mC/μC/nC/pC) follow a strict thousand-fold relationship.
Content last updated：2026-07-17
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