Charge Converter

Amaze SEO Tools provides a free online Charge Converter that accepts a numeric value in one electric charge unit and calculates the equivalent in sixteen other units simultaneously, with no software installation or account required.

Electric charge is the fundamental physical quantity that describes the amount of electricity carried by an object or flowing through a circuit. It is measured in a wide variety of units depending on the context — the SI coulomb for general physics and engineering, ampere-hours for battery capacity, elementary charges for particle physics, and CGS units like statcoulombs and abcoulombs for specialised electromagnetic theory. Converting between these units is essential when working across disciplines, interpreting datasheets from different standards, comparing battery specifications, and solving physics problems that mix unit systems.

Our converter handles every standard charge unit. Enter your value, select the source unit, click Convert, and see the measurement expressed across all seventeen supported units instantly.

Input Fields

Value

The first field is labelled "Value" where you enter the numeric charge measurement you want to convert. Type any positive number — for example, 1 for 1 coulomb, 2.5 for 2.5 ampere-hours, or 1000 for 1,000 microcoulombs. The tool accepts whole numbers and decimals.

Convert From Coulomb to Others

A dropdown menu labelled "Convert From Coulomb to Others" lets you select which unit your input value is expressed in. The dropdown defaults to coulomb (C) and contains seventeen electric charge units:

• Coulomb (C) — The SI unit of electric charge. One coulomb equals the charge transported by a current of one ampere flowing for one second. It is the standard unit for all general-purpose charge measurement in physics, electrical engineering, and chemistry. One coulomb contains approximately 6.242 × 10¹⁸ elementary charges.
• Megacoulomb (MC) — One million coulombs (10⁶ C). An extremely large quantity used in theoretical calculations and large-scale electrostatic phenomena such as lightning research and atmospheric electricity studies. A single lightning bolt transfers roughly 1–5 coulombs — a megacoulomb far exceeds any everyday occurrence.
• Kilocoulomb (kC) — One thousand coulombs (10³ C). Used in industrial electrochemistry, electroplating processes, and large-scale electrical systems where charge quantities are measured in thousands of coulombs.
• Millicoulomb (mC) — One thousandth of a coulomb (10⁻³ C). Common in electronics, capacitor specifications, and biomedical applications. The charge stored in small to medium capacitors is often measured in millicoulombs.
• Microcoulomb (µC) — One millionth of a coulomb (10⁻⁶ C). Used extensively in electronics for capacitor charge, electrostatic discharge (ESD) testing, and sensor measurements. A typical ceramic capacitor charged to a few volts holds microcoulomb-scale charge.
• Nanocoulomb (nC) — One billionth of a coulomb (10⁻⁹ C). Common in precision electronics, piezoelectric sensor output, and electrostatic measurements where very small charge quantities must be quantified accurately.
• Picocoulomb (pC) — One trillionth of a coulomb (10⁻¹² C). Used in radiation detection (ionisation chambers and Geiger counters produce picocoulomb-level signals), ultra-sensitive charge measurement, and particle physics instrumentation.
• Abcoulomb (abC) — The CGS electromagnetic unit of charge. One abcoulomb equals exactly 10 coulombs. Used in the Gaussian/CGS-EMU unit system that appears in older physics textbooks and some branches of theoretical electromagnetism.
• EMU of Charge — The electromagnetic unit of charge in the CGS system, identical in value to the abcoulomb (1 EMU = 10 C). Encountered in historical physics literature and CGS-based electromagnetic calculations.
• Statcoulomb (stC) — The CGS electrostatic unit of charge. One statcoulomb equals approximately 3.336 × 10⁻¹⁰ coulombs. Used in the CGS-ESU system for electrostatic calculations, particularly in older academic texts and some areas of plasma physics.
• ESU of Charge — The electrostatic unit of charge in the CGS system, identical in value to the statcoulomb (1 ESU ≈ 3.336 × 10⁻¹⁰ C). Appears in historical electrostatics literature and Gaussian unit system equations.
• Franklin (Fr) — Another name for the statcoulomb, honouring Benjamin Franklin's pioneering work in electricity. One franklin equals one statcoulomb (≈ 3.336 × 10⁻¹⁰ C). The three terms — statcoulomb, ESU of charge, and franklin — all represent the same quantity.
• Ampere-hour (A·h) — A time-based charge unit: the charge transferred by a steady current of one ampere flowing for one hour. One ampere-hour equals 3,600 coulombs. This is the standard unit for battery capacity — a phone battery rated at 3,000 mAh (3 A·h) can deliver 3 amperes for one hour or 1 ampere for three hours.
• Ampere-minute (A·min) — The charge transferred by one ampere flowing for one minute. One ampere-minute equals 60 coulombs. Used in electrochemistry and electroplating calculations where process durations are measured in minutes.
• Ampere-second (A·s) — The charge transferred by one ampere flowing for one second. One ampere-second equals exactly one coulomb (1 A·s = 1 C). This unit makes the relationship between current, time, and charge explicit: Charge = Current × Time.
• Faraday (based on carbon 12) — The charge carried by one mole of electrons: approximately 96,485.33212 coulombs. Named after Michael Faraday, this unit is fundamental to electrochemistry — it defines the charge needed to deposit or dissolve one mole of a monovalent substance during electrolysis. Faraday's constant (F) is one of the most important values in chemistry and electrochemistry.
• Elementary Charge (e) — The charge carried by a single proton (positive) or electron (negative): approximately 1.602 × 10⁻¹⁹ coulombs. This is the fundamental quantum of electric charge — all observable charges in nature are integer multiples of the elementary charge. Used in particle physics, quantum mechanics, and semiconductor physics.

reCAPTCHA (I'm not a robot)

Below the dropdown, tick the "I'm not a robot" checkbox to pass the security verification before converting.

Action Buttons

Three buttons appear beneath the reCAPTCHA:

Convert (Blue Button)

The primary action. After entering your value and selecting the source unit, click "Convert" to calculate the equivalent in all other supported charge units. Results appear on screen instantly.

Sample (Green Button)

Loads an example value and unit selection into the fields so you can preview the conversion output before entering your own data.

Reset (Red Button)

Clears the value field, resets the dropdown to coulomb (C), and removes any converted results — returning the tool to its initial state.

How to Use Charge Converter – Step by Step

1. Open the Charge Converter on the Amaze SEO Tools website.
2. Enter your charge value in the Value field.
3. Select the source unit from the dropdown — the unit your input is currently expressed in.
4. Tick the reCAPTCHA checkbox to verify yourself.
5. Click "Convert" to generate all equivalent values.
6. Read or copy the results showing your charge in all seventeen units.

Key Conversion Factors

All charge units can be converted through the coulomb as the central reference:

SI Metric Prefixes (Decimal Scaling)

• 1 Megacoulomb (MC) = 1,000,000 C = 10⁶ C
• 1 Kilocoulomb (kC) = 1,000 C = 10³ C
• 1 Coulomb (C) = 1 C (base unit)
• 1 Millicoulomb (mC) = 0.001 C = 10⁻³ C
• 1 Microcoulomb (µC) = 0.000001 C = 10⁻⁶ C
• 1 Nanocoulomb (nC) = 10⁻⁹ C
• 1 Picocoulomb (pC) = 10⁻¹² C

CGS Units

• 1 Abcoulomb (abC) = 10 C (CGS-EMU system)
• 1 EMU of Charge = 10 C (identical to abcoulomb)
• 1 Statcoulomb (stC) ≈ 3.33564 × 10⁻¹⁰ C (CGS-ESU system)
• 1 ESU of Charge ≈ 3.33564 × 10⁻¹⁰ C (identical to statcoulomb)
• 1 Franklin (Fr) ≈ 3.33564 × 10⁻¹⁰ C (identical to statcoulomb)

Time-Based Units

• 1 Ampere-hour (A·h) = 3,600 C
• 1 Ampere-minute (A·min) = 60 C
• 1 Ampere-second (A·s) = 1 C

Fundamental and Chemical Units

• 1 Faraday ≈ 96,485.33 C (charge per mole of electrons)
• 1 Elementary Charge (e) ≈ 1.602176634 × 10⁻¹⁹ C

The Three Unit Families Explained

SI Coulomb Family

The coulomb and its metric prefixes (MC, kC, mC, µC, nC, pC) form a simple decimal scaling chain where each step multiplies or divides by 1,000. This is the modern, universally adopted system used in engineering, electronics, and applied physics. The ampere-second is numerically identical to the coulomb (1 A·s = 1 C), making the ampere-hour and ampere-minute straightforward extensions: multiply the current by the time in the appropriate unit.

CGS Electromagnetic and Electrostatic Units

The centimetre-gram-second (CGS) system predates SI and splits into two subsystems for electromagnetic quantities. The CGS-EMU system defines the abcoulomb (= 10 C), while the CGS-ESU system defines the statcoulomb (≈ 3.336 × 10⁻¹⁰ C). The franklin is an alternate name for the statcoulomb. These units appear in older physics textbooks, Gaussian unit equations, and specialised areas of theoretical physics. The large numerical difference between abcoulombs and statcoulombs (a factor of roughly 3 × 10¹⁰) reflects the speed of light, which connects the electromagnetic and electrostatic CGS subsystems.

Fundamental and Electrochemical Units

The elementary charge (e) is the charge on a single proton or electron — the smallest observable unit of charge in nature. The Faraday constant links charge to chemistry: one faraday is the total charge carried by one mole (6.022 × 10²³) of elementary charges. Both are physical constants rather than arbitrary unit definitions, making them fundamentally important in particle physics and electrochemistry respectively.

Real-World Use Cases

1. Comparing Battery Capacities

Battery capacity is universally rated in milliampere-hours (mAh) or ampere-hours (A·h). Converting to coulombs allows direct comparison with physics calculations, energy equations, and electrochemical analyses. A 5,000 mAh smartphone battery stores 18,000 coulombs (5 A·h × 3,600) — the converter makes this translation instant.

2. Electrochemistry and Electrolysis Calculations

Faraday's laws of electrolysis require charge in coulombs or faradays to calculate the mass of material deposited or dissolved. Converting between ampere-hours (the practical measurement from a power supply) and faradays (the theoretical calculation unit) is a routine step in electroplating, metal refining, and battery chemistry.

3. Capacitor Charge Calculations

Capacitor datasheets specify capacitance in farads, but the actual charge stored (Q = C × V) is in coulombs. Small capacitors store charge in microcoulombs or nanocoulombs, while supercapacitors can store hundreds of coulombs. The converter translates between these scales for circuit design and energy storage analysis.

4. Particle Physics and Quantum Measurements

In particle physics, charges are expressed as multiples of the elementary charge (e). An alpha particle carries +2e, a proton carries +1e. Converting between elementary charges and coulombs bridges the gap between particle-level descriptions and macroscopic electrical measurements.

5. Converting Between SI and CGS Unit Systems

Physics students and researchers working with older textbooks or theoretical papers in the Gaussian/CGS system encounter abcoulombs, statcoulombs, and franklins. The converter translates these into SI coulombs for use with modern instruments, software, and publications that use the SI standard.

6. Radiation Detection and Dosimetry

Ionisation chambers and radiation detectors measure charge in picocoulombs or nanocoulombs. Converting these measurements to coulombs or other units is necessary for calibration, dose calculations, and regulatory compliance reporting in medical physics and nuclear safety.

7. Electrical Engineering Coursework

Students studying circuit theory, electromagnetism, and electrochemistry regularly convert between charge units in homework and examination problems. The converter serves as a verification tool for manual calculations and helps build fluency across unit systems.

Frequently Asked Questions

Q: How many charge units does the converter support?

A: Seventeen units: Coulomb (C), Megacoulomb (MC), Kilocoulomb (kC), Millicoulomb (mC), Microcoulomb (µC), Nanocoulomb (nC), Picocoulomb (pC), Abcoulomb (abC), EMU of Charge, Statcoulomb (stC), ESU of Charge, Franklin (Fr), Ampere-hour (A·h), Ampere-minute (A·min), Ampere-second (A·s), Faraday, and Elementary Charge (e).

Q: What is the relationship between coulombs and ampere-hours?

A: One ampere-hour equals 3,600 coulombs. The relationship comes from the definition: Charge = Current × Time. One ampere flowing for one hour (3,600 seconds) transfers 3,600 coulombs of charge.

Q: Are statcoulomb, ESU of charge, and franklin the same thing?

A: Yes. All three are different names for the same quantity — the CGS electrostatic unit of charge, equal to approximately 3.336 × 10⁻¹⁰ coulombs. "Franklin" honours Benjamin Franklin, while "statcoulomb" and "ESU of charge" describe the unit's position in the CGS system.

Q: What is the Faraday constant?

A: The Faraday constant (F) is approximately 96,485.33 coulombs per mole. It represents the total electric charge carried by one mole (Avogadro's number) of elementary charges. It is fundamental to electrochemistry — Faraday's laws use it to calculate mass deposited during electrolysis.

Q: How small is an elementary charge?

A: One elementary charge equals approximately 1.602 × 10⁻¹⁹ coulombs — an incredibly small quantity. One coulomb contains about 6.242 × 10¹⁸ elementary charges. The elementary charge is the smallest unit of free charge observed in nature and is carried by a single proton or electron.

Q: Why are abcoulombs and statcoulombs so different in size?

A: The abcoulomb (10 C) comes from the CGS electromagnetic system, while the statcoulomb (≈ 3.336 × 10⁻¹⁰ C) comes from the CGS electrostatic system. The ratio between them is approximately 3 × 10¹⁰, which equals the speed of light in centimetres per second — reflecting the fundamental connection between electricity and magnetism discovered by Maxwell.

Q: How do I convert battery mAh to coulombs?

A: First convert milliampere-hours to ampere-hours by dividing by 1,000. Then multiply by 3,600 to get coulombs. For example, a 4,000 mAh battery = 4.0 A·h = 14,400 coulombs. Or simply enter 4 in the Value field, select ampere-hour, and click Convert.

Q: Is my data stored or shared?

A: No. The calculation runs entirely within the tool interface. Your input value and the converted results are never saved, logged, or transmitted to any external service.

Convert any electric charge measurement between Coulombs, Ampere-hours, Faradays, Elementary Charges, Statcoulombs, Abcoulombs, and twelve more units — use the free Charge Converter by Amaze SEO Tools for battery comparisons, electrochemistry calculations, capacitor design, particle physics, CGS unit translation, and electrical engineering coursework!